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WASEDA-K-STATE SUSTAINABILITY SYMPOSIUM (May 20, 2024)

Date	May 20 (Mon) 13:00-17:40
Place	2nd Conference Room, 1F, Building 55-N
Program
13:00-	Opening remark (Ayumi Amama, K-State), Lunch
13:50	Lectures by Noda-Hanada Group, Waseda University, Japan Dr. Zih-Ee Lin: Circular Economy: Giving EV Batteries a Second Life Dr. Tomotaro Mae: Contribution of Li Secondary Batteries to Carbon Neutrality Mr. Katsuya Namiki: Efforts to Reduce CO2 Emissions in Concrete Production
14:20	Lecture by Prof. Placidus Amama, Kansas State University, USA
14:50	Lecture by Mr. Itoh, Ito Exterior Planning Office, Japan Sustainable Design Approach for Super High Rise: Simultaneous Architectural Design and Maintenance Design Perspectives
15:20	Grouping (5 groups), Self-introduction, Break
15:40	Breakout Sessions: What can/shall we do for sustainability?
16;40	3 min speech from each group
17:00	Tour and Summary

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Prof. Esko I. Kauppinen's Lecture on synthesis and thin film application of carbon nanotubes (Jan. 26, 2024)

Date	Jan. 26 (Fri) 15:00-16:40
Place	Room 610, 6F, Building 55-S
Title	Atomic structures of SWNTs and DWNTs from FC-CVD synthesis
Lecturer	Prof. Esko I. Kauppinen Professor, Department of Applied Physics, Aalto University School of Science, Finland
Abstract	We summarize our research on the atomic structure distributions of SWNTs from the floating catalyst chemical vapor deposition synthesis using ferrocene decomposition-based iron nanoparticle catalyst and carbon monoxide, alcohols and ethylene as the carbon precursors. When using CO as well as ethanol as the carbon precursors, the (n,m) distributions are biased towards the armchair side. Interestingly, when using ethylene and toluene as the carbon sources, the chiral angle distributions are broad. We present CNTs from methane-based FC-CVD. Based on the Fe-C-S system, the double-wall CNTs (DWCNTs) with a mean diameter of 4.15 nm and a mean bundle length of 20 um have been synthesized. After gold chloride solution doping, the DWNT based transparent conducting films (TCF) show an excellent performance of 42 ohm/sq sheet resistance at 90% transmittance, and 35 ohm/sq when doped with HNO3. These high-performance DWNTs films have an ultra-high yield i.e. production rate, being two orders of magnitude higher than that of SWNT based TCFs with similar performance. The DWNTs films contain ‘small’ bundles with around 50% of CNTs being individual. Interestingly, the large-diameter DWNTs seem to flatten at the junctions, which can provide a larger contact area between the tubes and accordingly reduce the contact resistance between the tubes. Also, we report recent results on DWNT non-transparent line based TCFs. When the DWNT line width is around 250 micrometers and the lines cover 10 % of the electrode area, i.e. the transmittance is 90 %, the sheet resistance after AuCl3 doping is as low as 2 ohms/sq. Finally, we discuss the atomic structures i.e. (n,m) distributions as determined with the electron diffraction of individual DWNTs. We find broad chiral angle distributions and no correlation between the chiral angles of the inner and outer walls.

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Prof. Il Jeon's Lecture on Low-Dimensional Nanomaterials in Optoelectronics (Jan. 11 & 18, 2024)

Date	Jan. 11 & 18 (Thu) 9:00-9:50
Place	Room B03, BF, Building 54
Title	Seminar 1. Chemistry of Low-Dimensional Nanomaterials in Optoelectronics: I Carbon Nanotubes. (Jan. 11) Seminar 2. Chemistry of Low-Dimensional Nanomaterials in Optoelectronics: II Fullerene and Biomaterials. (Jan. 18)
Lecturer	Prof. Il Jeon Associate Professor, Sungkyunkwan University (SKKU), Korea
Abstract	Our research is centred on the utilisation of nanocarbon allotropes in a range of energy, transistor and optoelectronic devices. We have addressed fundamental challenges inherent in nascent thin-film optoelectronics, specifically silicon, organic, and perovskite solar cells, through the application of these nanocarbon materials. In particular, the efficiency, durability, and flexibility of these devices have been markedly enhanced by incorporating carbon allotropes such as carbon nanotubes, graphene, and fullerenes. Their abundant availability and robust characteristics render them ideal substitutes for traditional materials, which are both limited and rigid. In my presentation, I shall discuss the advancements and overall scope of my research, as well as the future direction of my team, which is poised to make significant contributions to the field of materials science.
Biography	IL JEON read Chemistry for Bachelors and Masters degrees at Oxford University, UK. Upon graduation in 2008, he worked as the youngest senior researcher at LG Display Co. Ltd., South Korea for 5 years. In 2016, he received a Ph.D. degree in Chemistry with honours from the University of Tokyo, Japan. After working as a JSPS post-doctoral fellow, he worked as an Assistant Professor and a Lecturer at the same university. He later joined Sungkyunkwan University (SKKU) as an Associate Professor in the Department of Nano Engineering and SKKU Advanced Institute of NanoTechnology (SAINT). Currently, he serves as the Vice Provost for International Affairs at SKKU, while holding an Early-Tenured Professorship. His team are working on nanomaterials, namely, nanocarbon and biomaterials for various devices ranging from energy (solar cells & batteries) to sensor applications. Additionally, he is the founder and CEO of JLabNT Co. Ltd. and has, thus far, published more than 100 lead-authored SCI papers, mostly as the lead-author, and registered more than 5 international & 20 domestic patents.

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Wei-Hung CHIANG先生 ナノ材料の合成と応用 講演会 (Dec. 12, 2023)

Date	Dec. 12 (Tue) 10:30-12:00
Place	Room 403, 4F, Building 54
Title	Microplasma Engineering of Nanomaterials Synthesis and Applications （マイクロプラズマエンジニアリングによるナノ材料の合成と応用）
Lecturer	Prof. Wei-Hung CHIANG Professor, Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan
Abstract	Microplasmas are a special class of electrical discharges formed in geometries where at least one dimension is less than 1 mm. As a result of their unique scaling, microplasmas operate stably at atmospheric pressure and contain large concentrations of energetic electrons (1-10 eV). These properties are attractive for a range of nanomaterials synthesis and nanostructure engineering such as metal nanostructures and semiconductor nanomaterials [1]. Recently, we found that the energetic species including radicals, ions and electrons generated in the microplasmas were capable of initiating electrochemical-assisted reactions for the nucleation and growth of graphene quantum dots (GQDs), silicon quantum dots (SiQDs), and metal nanoclusters (MNCs). Moreover, we discover a simple and controlled synthesis of metal/metal, metal/QD heterostructures using our unique microplasma engineering. In this presentation, I will discuss these topics in detail, highlighting the advantages of microplasma-based system for the synthesis of well-defined nanomaterials for emearging appplications including detections of SARS-CoV-2 proteins [2], cancer and neurotransmitter biomarkers [3, 4], drug delivery [5] and environmental applications such as clean water production [6] and CO2 adsorption [7]. These experiments will aid in the rational design and fabrication of nanomaterials for nanotechnology-enhanced biosensors and may also have significant impact in emerging applications for next generation biomedical applications. [1] Wei-Hung Chiang, Davide Mariotti, R Mohan Sankaran, J Gary Eden, Kostya Ostrikov, Advanced Material, 2020 32, 1905508. [2] Yi-Jui Yeh, Trong-Nghia Le, Wesley Wei-Wen Hsiao, Kuo-Lun Tung, Kostya Ken Ostrikov, Wei-Hung Chiang, Analytica Chimica Acta, 2023, 1239, 25, 340651. [3] Darwin Kurniawan, Neha Sharma, Michael Ryan Rahardja, Yu-Yuan Cheng, Yan-Teng Chen, Guan-Xian Wu, Yen-Yu Yeh, Pei-Chun Yeh, Kostya Ken Ostrikov, Wei-Hung Chiang, ACS Applied Materials & Interfaces, 2022, 14, 46, 52289?52300. [4] Yan-Yi Chen, Darwin Kurniawan, Seyyed Mojtaba Mousavi, Pavel V. Fedotov, Elena Obraztsova, Wei-Hung Chiang, Journal of Materials Chemistry B, 2022, 10, 9654-9661. [5] Darwin Kurniawan, Jacob Mathew, Michael Ryan Rahardja, Hoang-Phuc Pham, Pei-Chun Wong, Neralla Vijayakameswara Rao, Kostya (Ken) Ostrikov, Wei-Hung Chiang, Small, 2023, 2206813. [6] Yi-Jui Yeh, Wei Lin, Wei-Hung Chiang, Kuo-Lun Tung, Journal of Membrane Science, 2023, 121334. [7] Yi-Jui Yeh, Wei Lin, Wei-Hung Chiang, Kuo-Lun Tung, Chemical Engineering Journal, 2023, 14654.

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Joey D. Ocon先生 エネルギー技術講演会 (Sep. 20, 2019)
〜 第５回先端化学知の社会実装コロキウム 〜

日時	9/20(金) 16:00-17:30
場所	52号館202教室
演題	Vertically Integrated Research Approach on Energy Storage Technology Development （蓄エネルギー技術の垂直統合研究）
講演者	Prof. Joey D. Ocon Laboratory of Electrochemical Engineering (LEE), Department of Chemical Engineering, College of Engineering, University of the Philippines Diliman, Quezon City 1101, Philippines
概要	Since the industrial revolution, society’s access to affordable and reliable energy has been the identifying cornerstone of the increasing prosperity and economic growth. Electricity, however, has a major Achilles’ heel, the challenges of storing it, which makes coping with any variability of demand and supply a major task in any electricity-driven economy. While demand has always varied with the pattern of human energy consumption, nowadays, supply is becoming inherently variable too because of the intermittent nature of wind and solar. Energy storage technologies would allow us to reduce net variability, make better use of variable renewable energy, lessen fossil fuel dependence, and bring enormous benefits. Among energy storage technologies, chemical (e.g. fuel cells, electrolyzers) and electrochemical energy storage (e.g. batteries) play a central role in decarbonizing the world’s electricity system. Here, I will describe our laboratory’s multi-disciplinary, vertically integrated research approach in solving challenges in energy storage at various spatiotemporal scales. With energy storage technology development as the central theme, our research activities are attempting to solve key issues in the catalyst screening at the atomic scale, electrode development at the electrochemical cell level, design and development of energy storage devices, and techno-economics of renewable energy-based hybrid systems in off-grid areas. For instance, using ab initio density functional theory (DFT)-based calculations, our team has explored unreported novel dopants in graphene and graphitic carbon nitride for electrocatalytic applications. At the cell level, we are trying to develop novel electrode materials for Mg-ion and Li-S batteries, water electrolysis, fuel cells, photoelectrochemical water splitting, transient biodegradeable batteries, among others. We are continuously developing improved battery packs for solar home systems and hybrid battery energy storage system for household and off-grid systems. At the system level, I will present our recent collaborative work with German researchers on the techno-economic potential of solar PV-battery-diesel hybrid systems for off-grid islands in the Philippines.
主催	早稲田大学 理工学術院総合研究所 先端化学知の社会実装領域

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市川 貴之 先生・水素エネルギー講演会 (July 12, 2019)

日時	7/12(金) 14:00-15:30
場所	55号館S棟4F 407室
演題	水素化物の高機能化に関する研究開発 〜水素貯蔵，リチウムイオン二次電池，アンモニア，水素の化学昇圧〜
講演者	市川 貴之 先生 広島大学大学院工学研究科機械物理工学専攻 教授
概要	軽元素で構成される水素化物は，Ni-MH電池の負極材料などに使われる水素吸蔵合金と比べると，重量当たりの水素密度が高い。一般的に，凝縮相として水素が吸蔵された場合，体積当たりの水素密度は液体水素を凌ぐ値となるため，水素貯蔵材料としてみた場合，軽元素系の材料が有利になる。本講演では，こうした水素化物に着目し，高容量の水素貯蔵材料としての見通し，リチウムイオン二次電池の負極材料としての能力，新たな利用形態として期待が高まる化学昇圧用途としての利用など，我々のグループでのアクティビティを紹介したい。また，エネルギーキャリアとして期待されるアンモニアをより簡便に利用するための，材料の役割についても詳細に説明を行う予定である。

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Michael H. Huang先生・半導体結晶講演会 (Jul. 5, 2019)

日時	7/5(金) 13:30-15:00
場所	63号館2F 203室
演題	Strongly Facet-Dependent Properties of Semiconductor Crystals （半導体結晶のファセットに強く依存した物性）
講演者	Prof. Michael H. Huang Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
概要	Our extensive investigations on the various properties of Cu2O, Ag2O, PbS, and Ag3PO4 crystals have shown they possess facet-dependent photocatalytic activity, electrical conductivity, and optical properties.[1] For example, {110}-bound Cu2O rhombic dodecahedra are more photocatalytically active than {111}-bound Cu2O octahedra, but {100}-bound cubes are inactive. Deposition of ZnO, ZnS, CdS, and Ag3PO4 nanostructures on these Cu2O polyhedra can often lead to partial or complete photocatalytic activity suppression despite their favorable bulk band energy alignment. This happens because facet effects should be extended to semiconductor interfaces, and frequently interfacial band bending can make photoexcited charge transfer across the interfaces becomes unfavorable. For electrical conductivity properties, a Cu2O octahedron is highly conductive like a metal, a cube behaves like a semiconductor, while a rhombic dodecahedron is an insulator. The existence of a thin surface layer with dissimilar band structures for different crystal surfaces and thus different degrees of band bending at the crystal surfaces can explain these facet-dependent observations. Recently, we have shown Si and Ge wafers also possess facet-dependent electrical conductivity behaviors.[2,3] We have also synthesized size-tunable Cu2O cubes, octahedra, and rhombic dodecahedra to demonstrate their possession of size- and facet-dependent light absorption and emission properties.[4] This means band diagram of semiconductors must be modified to account for the optical size and facet effects. All these properties are related. Bond length, bond geometry, and frontier orbital electron distributions within in the ultrathin Si and Ge surface layers are different from those of the bulk, showing semiconductor facet effects should have quantum mechanical basis at the orbital level. [1] Huang, M. H.; Naresh, G.; Chen, H.-S. Facet-Dependent Electrical, Photocatalytic, and Optical Properties of Semiconductor Crystals and Their Implications for Applications. ACS Appl. Mater. Interfaces 2018, 10, 4-15. [2] Tan, C.-S.; Huang, M. H. Silicon Wafers with Facet-Dependent Electrical Conductivity Properties. Angew. Chem. Int. Ed. 2017, 56, 15339-15343. [3] Hsieh, P.-L.; Lee, A.-T.; Chen, L.-J.; Huang, M. H. Germanium Wafers Possessing Facet-Dependent Electrical Conductivity Properties. Angew. Chem. Int. Ed. 2018, 57, 16162. [4] Huang, J.-Y.; Madasu, M.; Huang, M. H. Modified Semiconductor Band Diagrams Constructed from Optical Characterization of Size-Tunable Cu2O Cubes, Octahedra, and Rhombic Dodecahedra. J. Phys. Chem. C 2018, 122, 13027-13033.
主催	早稲田大学・理工学術院

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化学工学とSDGs・参加型ワークショップ・テストイベント (Mar. 7, 2019)

日時	3/7(木) 17:30-19:30
場所	55号館S棟4F 410室
参加者	UNIDO 飯野福哉氏、東京大学 山本光夫氏、慶応義塾大学 藤岡沙都子氏、学生 早稲田大学 野田優氏、野田・花田研・スタッフ・学生 合計42名
主催	APCChE2019・APCChE-UNIDO特別シンポジウム&Student Programオーガナイザー
共催	理工学術院総合研究所・先端化学知の社会実装研究所
概要	化学工学は、化学技術の社会実装を通じて社会に貢献する実学です。 しかし、化学技術および社会ニーズの複雑化に伴い、両者の距離が拡大し、 化学工学研究が社会に貢献するのが難しくなっているのが実情です。 2015年に国際連合により持続可能な開発目標SDGs (Sutainable Development Goals)が採択され、 世界的にSDGsをビジョンに動き始めています。 　化学技術の実装を通じた社会への貢献には、社会との距離を縮めることが欠かせません。 まずは、我々、化学工学を専門とする教員・学生が、専門家かつ一般市民の両面の立場から、 全員参加で、固定概念にとらわれずにアイディア出しをし、グループで議論し意見を集約する、 参加型ワークショップのテストイベントを実施しました。 このような企画・運営に豊富な経験をお持ちの、国際連合工業開発機関(UNIDO)の飯野福哉氏の全面的な協力の下、 東京大学・慶応義塾大学からもご参加いただきました。 詳細はこちらをご覧ください。 UNIDOのホームページに記事が掲載されました。

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Esko I. Kauppinen先生・単層カーボンナノチューブ・カイラリティ制御合成講演会 (Nov. 15, 2018)

日時	11/15(木) 14:30-16:00
場所	55号館S棟4F 407室
演題	Colorful SWNT thin films with the FC-CVD synthesis via tuning (n,m) distributions （カイラリティ分布を制御したカラフルな単層カーボンナノチューブ膜の浮遊触媒CVD法による合成）
講演者	Prof. Esko I. Kauppinen Vice-Dean, Aalto University School of Science & Professor, Department of Applied Physics, Aalto University School of Science
概要	We have explored floating catalyst chemical vapor deposition (FC-CVD) synthesis of single walled carbon nanotubes (SWNT) for tuning (n,m) distributions. Ferrocene has been used as the catalyst nanoparticle precursor and CO, C2H4, ethanol and toluene as the carbon precursors and CO2, H2O, H2S and tiophene as the respective additives. By introducing various amount of CO2 in FC-CVD with CO as the carbon source and in-situ ferrocene decomposition generated Fe catalyst nanoparticles, we directly synthesized SWNT films with tunable (n,m) i.e. helicity distribution as well as tunable colors [1]. When operating the FC-CVD reactor at the ambient pressure and at 850 oC temperature with 0.25 and 0.37 volume percent of added CO2, the directly deposited SWNT films display green and brown colors, respectively. We ascribed various colors to suitable diameter and narrow (n,m) distributions, which were determined in detail using the electron diffraction. We will present recent results on using ethylene as the carbon source in N2 carrier gas with the addition of H2O vapor to synthesize SWNTs with extremely narrow (n,m) distribution and accordingly directly deposit colorful films. In addition, we discuss the SWNT diameter as well semiconducting fraction tuning with the ethanol and toluene carbon precursors and with ferrocene-thiophene in the H2-H2 carrier gas. Also, we will present recent results on SWNT synthesis when using spark discharge generated single and bimetallic nanoparticles as premade catalysts with C2H4 and H2S in H2-H2 carrier gas. [1] Y. Liao et al., Direct Synthesis of Colorful Single-Walled Carbon Nanotube Thin Films. J. Am. Chem. Soc. 140, 31, 9797- 9800 (2018).

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Qiang Zhang先生・リチウム-硫黄電池講演会 (March 9, 2018)

日時	3/9(金) 16:00-17:30
場所	54号館2F 202室
演題	Advanced Energy Materials for Lithium-Sulfur Batteries (リチウム-硫黄電池のための先進エネルギー材料)
講演者	Prof. Qiang Zhang Professor, Department of Chemical Engineering, Tsinghua University, China
Abstract	Among various promising candidates with high energy densities, lithium-sulfur (Li-S) batteries with a high theoretical capacity and energy density are highly attractive [1-2]; while the commercial application of Li-S batteries still faces some persistent obstacles, such as the low electrical conductivity of sulfur and lithium sulfide and the dissolution of polysulfides. The introduction of nanocarbon into the field of Li-S batteries sheds a light on the efficient utilization of sulfur by improving the conductivity of the composites and restraining the shuttle of polysulfides. In this presentation, the concept for the rational design of nanocarbon for energy storage is explained. The advances in the use of advanced energy materials in the cathode, separator, and anode is explained [3-14]. New insights on the relationship between the nanostructure and the electrochemical performance are presented. [1] Peng HJ, Cheng XB, Huang JQ, Zhang Q. Adv Energy Mater 2017, 7, 1700260. [2] Cheng XB, Zhang R, Zhao CZ, Zhang Q. Chem Rev 2017, 117, 10403. [3] Peng HJ, Huang JQ, Zhang Q. Chem Soc Rev 2017, 46, 5237. [4] Zhao MQ, Zhang Q, et al. Nature Commun 2014, 5, 3410. [5] Peng HJ, Zhang G, Chen X, Zhang ZW, Xu WT, Huang JQ, Zhang Q. Angew Chem Int Ed 2016, 55, 12990. [6] Peng HJ, Zhang ZW, Huang JQ, Zhang G, Xie J, Xu WT, Shi JL, Chen X, Cheng XB, Zhang Q. Adv. Mater. 2016, 28, 9551. [7] Cheng XB, Yan C, Chen X, Guan C, Huang JQ, Peng HJ, Zhang R, Yang ST, Zhang Q. Chem 2017, 2, 258. [8] Zhang XQ, Cheng XB, Chen X, Yan C, Zhang Q. Adv Funct Mater 2017, 27, 1605989. [9] Peng HJ, Huang JQ, Liu XY, Cheng XB, Xu WT, Zhao CZ, Wei F, Zhang Q. J Am Chem Soc 2017, 139, 8458. [10] Hou TZ, Xu WT, Chen X, Peng HJ , Huang JQ, Zhang Q. Angew Chem Int Ed 2017, 56, 8178. [11] Zhang R, Chen XR, Chen X, Cheng XB, Zhang XQ, Yan C, Zhang Q. Angew Chem Int Ed 2017, 56, 7764. [12] Zhang XQ, Xu R, Chen X, Cheng XB, Zhang R, Chen XR, Zhang Q. Angew Chem Int Ed 2017, 56, 14207. [13] Kong L, Chen X, Li BQ, Peng HJ, Huang JQ, Xie J, Zhang Q. Adv Mater 2018, 30, 1705219. [14] Zhang R, Chen X, Shen X, Zhang XQ, Chen XR, Cheng XB, Yan C, Zhao CZ, Zhang Q. Joule 2018, doi:10.1016/j.joule.2018.02.001.

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Wei-Hung Chiang先生・ナノカーボン講演会 (April 20, 2017)

日時	4/20(木) 16:00-17:30
場所	55号館S棟4F 407会議室
演題	Atmospheric-pressure controllable synthesis of heteroatom-doped carbon nanomaterials : synthesis, characterizations and applications （異種原子ドープ・ナノカーボン材料の常圧制御合成：合成、評価と応用）
講演者	Prof. Wei-Hung Chiang Assistant Professor, Department of Chemical Engineering, National Taiwan University of Science and Technology (NTUST), Taiwan
概要	Recent theoretical and experimental studies have suggested that heteroatom-doped carbon nanomaterials including carbon nanotubes (CNTs) and graphenes as novel materials with exceptional electrochemical property due to the heteroatom doping, making them particularly attractive from both scientific studies and innovation applications including energy storage and conversion, and electrochemical biosensing. Nevertheless, there are few reports investigating the effect of the heteroatom dopant concentrations in carbonaceous materials on their electrochemical properties. The difficulty is because of the lacking of efficient processes to precisely control the heteroatom dopant concentrations on the carbon surface. In this talk, I will introduce an atmospheric-pressure controllable synthesis of heteroatom-doped carbon nanomaterials and further discuss the possible applications. We show that boron-doped CNTs (BCNTs) with tunable boron atomic concentration can be synthesized by an atmospheric-pressure solution-assisted substitution reaction. We found that boron atomic concentrations in the nanotubes could be tuned by simply controlling the reaction temperature and time on the basis of detailed high-resolution transmission electron microscopy (HRTEM), electron energy loss spectroscopy (EELS), and X-ray photoelectron spectroscopy (XPS) characterizations. It is also noteworthy from a practical point of view that the developed atmospheric-pressure synthesis method is amenable to industrial-scale production since it avoids the need for a vacuum system [1]. Electrochemical characterization indicates a significant enhancement of 25% in the amperometric response for BCNTs with 2.1 at% boron atomic concentration than pristine CNTs, suggesting its potential as efficient catalysts for electrochemical detection of DA [2]. Significantly, we found BCNTs with enhanced thermal stability can be used on counter electrodes of dye-sensitized solar cells, causing a comparable light-to-electricity conversion efficiency of 7.91% to that of the Pt-based cell of 8.03% [3]. References: 1. W.-H. et al., RSC Advance (2015). 2. W.-H. et al., Sensors & Actuators B: Chemical (2017). 3. W.-H. et al., ACS Sustainable Chemistry & Engineering (2017). Group HP: http://ch2.ntust.edu.tw/files/13-1027-36835.php?Lang=en

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Stephan Hofmann先生・二次元材料講演会 (April 4, 2017)

日時	4/4(火) 14:00-15:30
場所	54号館 3F 301教室
演題	Towards integrated manufacturing of 2D materials （２次元材料の集積化製造に向けて）
講演者	Prof. Stephan Hofmann Professor, Department of Engineering, University of Cambridge, UK
概要	The foremost challenge for 2D materials is, like for so many other nanomaterials, to develop manufacturing and processing techniques that fulfil the industrial demands for quality, quantity, reliability, and low cost. To serve the industrial demand for “electronic-grade” 2D materials, we focus on chemical vapour deposition (CVD), and in this talk I will review our recent progress in scalable CVD [1] and device integration approaches of highly crystalline graphene and hexagonal boron nitride (h-BN) films. The systematic use of in-situ metrology, ranging from high-pressure XPS to in-situ STM and environmental electron microscopy, allows us to reveal some of the key mechanisms that dictate crystal phase, structural, defect, interfacial and heterogeneous integration control at industrially relevant conditions [2,3]. We systematically explored the parameter space of atomic layer deposition (ALD) of ultrathin oxides on graphene and can show that by extending the precursor residence time, using either a multiple-pulse sequence or a soaking period, ultrathin continuous AlOx films can be achieved directly on graphene [4]. As we show, these results have model system character for rational two-dimensional (2D)/non-2D material process integration [5]. We also highlight how the interplay between the 2D material and the catalyst is not only important for growth but also decisive for transfer processes and show how intercalation processes allow for instance local Cu oxidation at the interface followed by selective oxide dissolution, which gently releases the 2D material [6]. I will also review our extensive study on charge transfer chemical doping [7], interfacial band engineering for efficient charge injection/extraction, effective wetting, and process compatibility including masking and patterning. References [1] Hofmann et al. J. Phys. Chem. Lett. 6, 2714 (2015). [2] Weatherup et al., Nano Lett. 16, 6196 (2016). [3] Caneva et al. Nano Lett. 16, 1250 (2016). [4] Aria et al. ACS Appl. Mater. Interfaces 8, 30564 (2016). [5] Alexander-Webber et al., 2D Mater. 4, 011008 (2016). [6] Wang et al. ACS Appl. Mater. Interfaces 8, 33072 (2016). [7] Sanders et al., Nanoscale 7, 13135 (2015). Group HP: http://www-g.eng.cam.ac.uk/hofmann/people.php

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Informal seminar by Mr. Andrew Westover from Vanderbilt University (August 6, 2015)

Date	8/6(Thu) 15:00-17:30
Place	Building 54, 2F-203
	Multifunctional energy storage systems Andrew Westover Ph.D. Candidate, Nanomaterials and Energy Storage Devices Laboratory, Vanderbilt University Technological developments such as portable electronics, electric vehicles, and renewable energy conversion are driving the need for better and better energy storage systems. Whereas traditional energy storage research focuses on improving the energy density, power density, and reducing the cost multifunctional energy storage systems these routes also show great promise. Two promising and intriguing routes for developing such multifunctional energy storage systems are structural energy storage systems and integrated energy conversion and energy storage systems. The first of these focuses on multifunctional energy storage materials that can simultaneously store energy and function as a load bearing and structural material. We highlight the use of nanoporous materials, including nanoporous Si and anodized metals that are electrically and mechanically connected to bulk current collectors as an ideal structural energy storage architecture, and present electrochemical measurements while under simultaneous static and dynamic mechanical loads including tensile, shear, compression and vibratory loads for energy storage devices including carbonized porous Si supercapacitors. These devices can operate at commercial energy densities, and power densities, and can operate with minimal degradation under stresses greater than 1 MPa, and under vibratory accelerations greater than 80 g. In addition we show the importance of wet-dry performance on structural energy storage materials, and demonstrate the ability of devices with epoxy-ionic liquid electrolytes to function both mechanically and electrochemically in extreme environmental conditions such as immersion in water. We also present recent results showing that similar porous Si supercapacitors could be integrated directly into the back of silicon photovoltaics to form a fully integrated energy conversion and storage device, where light caused direct charging in the supercapacitor that could be discharged at a later time. The use of such an integrated system highlights the potential for direct integration of energy storage and conversion systems eliminating energy losses that come from transferring the energy to an external storage system.
	Fluidized-bed production of sub-millimiter-long, > 99%-pure carbon nanotubes Dr. Zhongming Chen Postdoctoral researcher in Noda Group, Department of Applied Chemistry, Waseda University
	Fabrication of large-grain crystalline Si thin films by rapid vapor deposition with in situ melt-crystallization Yuhei Yamasaki Master course student in Noda Group, Department of Applied Chemistry, Waseda University
	Fabrication of S/GO/CNT electrodes for lithium sulfur battery Keisuke Hori Master course student in Noda Group, Department of Applied Chemistry, Waseda University

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英国Cambridge大 Lorenzo D'Arsie氏 & Sabina Caneva氏とのInformal Seminar (July 24, 2015)

Date	7/24(Fri) 15:30-17:30
Place	Building 65, 1F, Room 108
	Stable injection of charge carriers in graphene Lorenzo D'Arsie Ph.D. Student, Department of Engineering, University of Cambridge Although pristine graphene has a high charge carrier mobility, its intrinsic charge carrier density is nearly zero. Doping is therefore necessary for industrial applications of graphene as a transparent, flexible conductor. In previous work we show that it is possible to obtain a significant reduction in resistance, using for example iodine treatment, which is, however, not sufficiently stable for industrial applications. A stable reduction in sheet resistance can be obtained by evaporation of high work function oxides, but the improvement in conductivity in comparison to the iodine treatment is more modest. A combination of stable and strong doping is thus still elusive. In this talk we will focus on a systematic analysis of the doping stability of nitric acid by electrical measurements, X-ray photoemission spectroscopy and Raman spectroscopy, for different treatments and under different environmental conditions. The analysed data is used to develop a procedure to stabilise the acid doping. This improvement in doping stability represents a step towards ITO replacement by graphene.
	Rational catalyst engineering for CVD of large, single crystalline domains of monolayer hexagonal boron nitride on iron films Sabina Caneva Ph.D. Student, Department of Engineering, University of Cambridge Large area monolayers of insulating hexagonal boron nitride (h-BN) are highly sought in nanoelectronics due to the range of attractive electronic, chemical and mechanical properties they display, as well as their design compatibility with other 2D layered materials. One of the main challenges to their integration in novel device architectures is the scalable growth of high quality films, which requires control over the domain size and thickness. The use of catalytic growth techniques has become the preferred route towards tailored synthesis. We demonstrate the growth of large (~0.3 mm side length) h-BN domains via low-pressure chemical vapor deposition (LPCVD) on Fe films. Using complementary selected area electron diffraction (SAED), dark field transmission electron microscopy (DF-TEM) and atomic force microscopy (AFM) we show that the large h-BN domains are monolayers and single crystals. We also demonstrate that an increase in precursor flux leads to a rise in the nucleation density, which can be exploited to achieve full coverage of the Fe catalyst with a uniform and continuous polycrystalline h-BN film. We perform a combination of in-situ X-ray diffraction (XRD) and ex-situ secondary ion mass spectrometry (SIMS) to elucidate the role of the catalyst on the growth of h-BN thin films, and illustrate that interlayer diffusion during annealing plays a central role in controlling the h-BN morphology. Tuning of the diffusion barrier thickness allows us to exclusively nucleate monolayer domains with very low nucleation densities.
	Simple and loss-free fabrication of carbon nanotube films for flexible electronics Hiroyuki Shirae Ph.D student in Noda Group, Department of Applied Chemistry, Waseda University
	Selective precipitation of few/multi-layer graphene on/around h-BN on SiO2 from metal-carbon films Kohtaro Yamaguchi Master course student in Noda Group, Department of Applied Chemistry, Waseda University

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Benji Maruyama博士 & 本間芳和教授 & Yuan Chen准教授
カーボンナノチューブ成長技術講演会 (June 26, 2015)

日時	6/26(金) 13:15-16:15
場所	54号館 2F 201教室
来訪者	Dr. Benji Maruyama, Senior Materials Research Engineer, Materials and Manufacturing Directorate, Air Force Research Laboratory, USA 本間 芳和 教授, 東京理科大学 理学部第一部 物理学科 Dr. Yuan Chen, Associate Professor of Chemical and Biomolecular Engineering, School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore
13:15-	Autonomous experimentation applied to carbon nanotube synthesis Benji Maruyama1, Daylond Hooper 1,2, Michael Krein3, Jason Poleski3, Rick Barto3, Fred Webber2 and Pavel Nikolaev1,2 1 Air Force Research Laboratory, Materials and Manufacturing Directorate, RXAS, WPAFB, Ohio 45433, USA. 2 UES Inc., Dayton, Ohio 45432, USA. 3 Lockheed Martin Advanced Technology Laboratories, Cherry Hill, NJ 08002, USA Carbon nanotubes have an exciting array of applications which span mechanical, electrical, thermal and chemical/sensing. However, full exploitation is slowed by a lack of control over synthesis. Despite the two decades since the explosion of work in the area, progress in controlled production of nanotubes is impeded by our lack of understanding of the fundamental mechanisms of nucleation and growth. Our group has endeavored to develop a method that addresses the critical bottlenecks impeding the speed of research by taking advantage of advances in robotics, artificial intelligence, data sciences and in-situ/in-operando characterization. Our Autonomous Research System, ARES, is capable of designing, executing and evaluating its own CNT growth experiments. Artificial intelligence module based on random tree / genetic algorithm statistical approach analyses experimentally obtained kinetic parameters (rate, time constant, etc.) and proposes new experiments to achieve user-defined objective. These are then executed by ARES automatically and without human intervention, and fed back into the AI module to ensure machine learning. Recent experiments utilized maximum growth rate as an objective. The normalized difference between the objective and experimentally observed growth rates behaves in a fashion similar to what is typically seen in the control systems, with experimentally observed growth rate oscillating around the target. The convergence can be expressed via cumulative root mean square (RMS) of the rate difference. RMS increases initially (divergence), followed by consistent decrease after ~50 experiments, indicating convergence. That is, after some unsuccessful experimentation, ARES was better able to supply experimental conditions that achieved the objective growth rate. We take this as a clear demonstration of autonomous AI learning: convergence on the objective via closed-loop iterative experimentation without human intervention.
14:15-	Single-walled carbon nanotubes growth from nano-carbon seeds Huafeng Wang, Chisato Yamada, and Yoshikazu Homma Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan Single-walled carbon nanotubes (SWCNTs) are efficiently synthesized by chemical vapor deposition (CVD) using metal nanoparticle catalysts. However, metal nanoparticles are thermally instable and suffer from ripening during the CVD process, which is one of the causes of limited catalyst lifetime. Another route of SWCNT synthesis is use of nano-carbon seeds such as fullerene fragments and nanotube segments, and promoting SWCNT growth epitaxially from the seeds. Although the yield and growth rate are still low, the new route has the possibility of continuous growth maintaining the chirality of the seed. Therefore, investigation for optimizing the SWCNT growth from nano-carbon seeds is particularly important. We comprehensively studied the growth of SWCNTs from nano-carbon seeds including fullerene and short nanotubes. Various parameters such as the pretreatment condition, substrates and carbon sources are investigated and their influences on the growth of SWCNT were thoroughly evaluated. By varying these parameters, the pretreatment as well as the growth conditions suitable for hot-wall and cold-wall CVD were established, and the re-growth of nanotubes from nanotube seeds was realized in these two systems. According to our experimental observation, the pretreatment is proven to be an indispensable process used to activate the nano-carbon seed. The growth window is narrow, and the efficiency of re-growth is largely determined by various conditions. On the basis of those experimental results, the process and mechanism of SWCNT re-growth are discussed.
15:15-	Tailoring Carbon Nanomaterials for Emerging Applications Yuan Chen Chemical and Biomolecular Engineering School of Chemical and Biomedical Engineering Nanyang Technological University N1.2-B1-16, 62 Nanyang Drive, Singapore 637459 Carbon nanotubes, graphene, fullerenes, and mesoporous carbon structures are a new class of carbon materials that hold promises in revolutionizing our life owing to their extraordinary electronic, thermal and mechanical properties. These properties rely on their unique nanoscale structures. My research interests focus on designing and developing chemical processes to (1) synthesize carbon materials with well-defined nanostructures, (2) assemble carbon nanomaterials into functional macroscale structures, and (3) utilize these novel carbon structures for electronics, sustainable energy and environmental applications. Three research topics will be discussed in my talk. First, we demonstrated the feasibility of manipulating the chirality and metallicity of single walled carbon nanotubes (SWCNTs) through catalytic chemical vapor deposition. In particular, sulfur doped cobalt catalysts were developed to selectively grow large-diameter semiconducting (9,8) SWCNTs of 1.17 nm in diameter, which have potential applications in emerging macroelectronics and optoelectronics for future telecommunication. Second, we created novel nanocarbon composites with tailored structures for energy storage and electrocatalysts. We used capillary columns as hydrothermal reactors to assemble graphene and SWCNTs into a unique multiscale hierarchical structured hybrid fiber, which has one of the highest volumetric capacitance among all reported porous carbon materials. The hybrid carbon fibers were employed to construct fiber supercapacitors as energy storage solutions for emerging miniaturized electronics and smart fabrics/textiles. Last, we showed that metallicity, dispersibility, and size governs the antibacterial activity of SWCNTs and graphene, which provide useful insights for developing strategies that can increase their biomedical and environmental application potentials, such as membranes for water treatment, while minimizing their environmental and health risks.

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Singapore PolytechniqueとのInformalセミナー(Dec. 2, 2014)

日時	12/2(火) 14:00-17:00
場所	62W号館1F大会議室
来訪者	Mr. Lance LIM Wei Seong, Chief Technology Officier, Singapore Polytechnic Dr. YIN Xi Jiang, Dr. SU Liap Tat, Dr. LI Ping, and Dr. LI Chunxiang, Advanced Materials Technology Center, Department for Technology, Innovation and Enterprise, Singapore Polytechnic
Dr. LI Ping	Singapore Polytechnic, Techonology Groups, およびAdanced Materials Technology Centerの紹介 先進塗布技術、特に電磁シールド技術の講演
野田研	野田: カーボンおよびシリコンベースナノ材料の実用的合成法と応用の研究概略紹介 白江: フレキシブルエレクトロニクスに向けたカーボンナノチューブのロスフリー分散・印刷 岸田: SiO2基板上へのグラフェンの直接形成 山崎: 太陽電池応用を目指した大粒径結晶シリコン膜の高速形成

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Esko I. Kauppinen教授 (Nov. 18, 2014)

講演会日時	11/18(火) 16:00-17:30
場所	52号館 3F 301教室
演題	Studies on SWNT bundling for high performance flexible and transparent thin film devices (高性能フレキシブル透明薄膜デバイスに向けた単層カーボンナノチューブのバンドル形成の研究)
講演者	Esko I. Kauppinen教授 Professor, Department of Applied Physics, Aalto University School of Science, Finland
概要	We report recent studies on the synthesis of high quality single-wall carbon nanotubes (SWCNTs) with a ferrocene-based floating catalyst CVD reactor and show that SWCNT networks consisting of highly individualized SWCNTs exhibit substantially improved transparent conductive film (TCF) performance, when compared to previous work with bundled SWCNT TCFs [1]. For these experiments, SWCNT concentration was controllably reduced, leading to reduced bundling probability and formation networks consisting of dominantly individual SWCNTs with mean diameter of 1.1 nm and a narrow helicity distribution near armchair edge, as observed with HR-TEM and electron diffraction techniques. The individual SWCNT networks exhibit excellent performance as transparent conductors with micro-grid patterns [2] showing sheet resistances as low as 67 Ohm/sq. at 97 % transmittance after rapid nitric acid doping. In addition, we performed a comprehensive statistical analysis of morphology, size and chemical compositions of a large number of catalyst nanoparticles, including both catalytically active and inactive ones, by means of aberration-corrected high-resolution transmission electron microscopy. The average diameter of active nanoparticles (~3.3 nm) is over three times larger than that of SWNTs (~1.1 nm), and more than 50 % of the particles are active i.e. grow the tube. In addition, we used our novel FC-CVD reactor based on spark discharge catalyst generation to experimentally study the effect of bundling on the performance of transparent conducting film (TCF) and thin film transistors (TFT). The synthesis of SWCNTs relies on generation of iron catalyst particles in the diameter range of 4±3 nm with precisely tunable concentration into nitrogen carrier gas with a spark generator, allowing to grow individual and high-quality SWCNTs from CO with well-defined diameter and length distributions. By controlling the gas phase residence time of the as formed SWCNTs prior depositing the network, we controlled the nanotube bundling. The TCFs fabricated of individual SWCNTs have intrinsically higher conductivity to transparency ratio compared to those fabricated of larger bundles. Similarly, network TFTs of individual SWCNTs exhibit higher uniformity in terms of both mobility and ON/OFF ratio compared to larger bundles, with ON/Off ratio up to 108 and mobilities above 100 cm2 V-1s-1, demonstrating the importance of individualization of SWNCTs. [1] A. Kaskela, A. G. Nasibulin, M. Y. Timmermans, B. Aitchison, A. Papadimitratos, Y. Tian, Z. Zhu, H. Jiang, D. P. Brown, A. Zakhidov, and E. I. Kauppinen, “Aerosol-Synthesized SWCNT Networks with Tunable Conductivity and Transparency by a Dry Transfer Technique,” Nano Lett., vol. 10, no. 11, pp. 4349?4355, Nov. 2010. [2] N. Fukaya, D. Y. Kim, S. Kishimoto, S. Noda, and Y. Ohno, "One-Step Sub-10 um Patterning of Carbon-Nanotube Thin Films for Transparent Conductor Applications", ACS Nano vol. 8, pp. 3285-293, April 2014.

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Dr. Thomas W.H. Oates from Germany (Jun. 3, 2013)

講演会日時	6/3(月) 16:00-17:30
場所	54号館BF B02号室
演題	Characterizing plasmonic metamaterials and thin films using spectroscopic ellipsometry (分光偏光解析法によるプラズモン・メタマテリアルと薄膜の評価)
講演者	Dr. Thomas W.H. Oates Forschungsbereich Material- und Grenzflachenanalytik Leibniz-Institut fur Analytische Wissenschaften - ISAS-Berlin, Germany (Staff Scientist, Material and Surface Science Division, Leibniz Institute for Analytical Sciences)
概要	The strong plasmonic resonances observed in nanoscale noble metal structures provide a base for fabricating designer optical components known as metamaterials. Recent advances in modelling and fabrication methods have demonstrated novel materials with unusual properties such as artificial optical magnetism and negative refractive index. However optical characterization of these materials is complicated by their structural dimensions being between the regimes of homogenous bulk materials and diffractive structures such as photonic crystals. This makes the interpretation of reflection and transmission measurements open to debate when assigning traditional optical properties such as refractive index and circular dichroism. I will present measured polarized reflection (ellipsometric) spectra of split ring resonators and fishnet metamaterials and identify the origin of the observed resonances. I will then discuss the advantages and limitations of describing these materials using bulk homogenous material parameters.

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Dr. Placidus Amama from USA (Dec. 4, 2012)

講演会日時	12/4(火) 13:00-14:30
場所	54号館2F203号室
演題	Advances in Rational Catalyst Design for Controlled CVD Growth of Carbon Nanotube Carpets (CVD法によるカーボンナノチューブカーペットの制御合成のための触媒の合理的設計の進歩)
講演者	Dr. Placidus Amama, Reseach Scientist University of Dayton Research Institute (UDRI) & Air Force Research Laboratory (AFRL), USA
概要	There has been growing interest in densely packed, vertically aligned single-walled carbon nanotube (SWCNT) carpets because of their suitability in a growing number of important technological applications. Among the existing methods for the growth of SWCNT carpets, catalytic chemical vapor deposition (CVD) appears to be the most suitable. Using an alumina/Fe catalyst and a suitable carbon feedstock, SWCNT carpets of millimeter-scale heights can be grown via water-assisted CVD. However, for efficient and controlled growth of SWCNT carpets to be achieved, there are several challenges that need to be addressed, such as unexpected or early growth termination of carpets that limits yield, difficulty in performing carpet growth on metallic or non-alumina supporting layers, and the lack of proper understanding of the growth mechanisms of carpets including many important aspects of support-metal interactions. In my talk, I will discuss the secret role of water during carpet growth and show how the growth termination process can be explained on the basis of Ostwald ripening and subsurface diffusion of the catalyst. Further, I will discuss the relationship between the 3D evolution of Fe catalyst supported on different alumina types and the catalyst behavior (activity and lifetime). Finally, new strategies for improving the activity and lifetime of Fe catalysts during carpet growth will be discussed.

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Dr. Toma Susi from Finland (Oct. 25, 2012)

講演会日時	10/25(木) 10:00-11:00
場所	65号館2F応化会議室(214号室)
演題	Floating catalyst synthesis of SWCNT thin films for transparent electrode applications （浮遊触媒法による透明電極用単層カーボンナノチューブ薄膜の合成）
講演者	Dr. Toma Susi, Reseach Associate Toma Susi, Kimmo Mustonen, Antti Kaskela, Joonas Parjanne, Albert G. Nasibulin, Esko I. Kauppinen NanoMaterials Group, Department of Applied Physics, Aalto University School of Science, Finland *toma.susiaalto.fi
概要	The floating catalyst CVD-based deposition process developed at Aalto during the past few years is very advantageous for nanotube thin film fabrication [1]. By eliminating liquid processing prior to deposition altogether it decreases the process duration and process-induced damaging of the nanotubes, and avoids the problem of persistent surfactant residues. Using ferrocene as the catalyst source and carbon monoxide as the carbon precursor, these SWCNT networks can be chemically doped to reach a sheet resistance of as low as 84 Ω/ at 90% optical transmittance [2]. Alternatively, we have produced catalyst particles using a hot wire generator, and studied the optoelectronic performance of the SWCNT thin films with respect to the properties of both individual nanotubes and their bundles [3]. We found that bundle lengths determined the thin-film performance, as would be expected for highly resistive bundle?bundle junctions. This can be described by a simple resistor network model [4]. Although the bundle diameters play a secondary role by simply affecting the absorption, we found no evidence that contact resistances were affected by the diameters. Our very recent conducting AFM measurements provide direct support for this, contrary to previous reports [5]. Finally, I'll describe our recent efforts directed at replacing carbon monoxide with acetylene as the carbon precursor in an attempt to increase the growth rate and produce longer SWCNT bundles. [1] A. Kaskela et al., Nano Lett. 10 (2010) 4349-4355, doi:10.1021/nl101680s [2] A.G. Nasibulin et al., ACS Nano 5 (2011) 3214-3221, doi:10.1021/nn200338r [3] K. Mustonen et al., just accepted to Beilstein Journal of Nanotechnology [4] T. Susi et al., Chem. Mater. 23 (2011) 2201-2208, doi:10.1021/cm200111b [5] P.N. Nirmalraj et al., Nano Lett., 9 (2009) 3890-3895, doi:10.1021/nl9020914

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