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Nanomaterials & Self-Organization

Let us think about the future clean energy systems. For large-scale electric power generation by solar cells, efficient use of high purity silicon is the key. We are trying to improve the efficiency several-ten times by making highly-crystalline films in one minute instead of bulk substrates. Transparent electrodes are important for both solar cells (yielding electricity from light) and display & lighting devices (generating lights from electricity). We try to replace rare-metal-based oxide semiconductors with carbon nanotubes or graphene. Nanotube-silicon hybrids are promising to realize Li ion batteries of larger capacities for (hybrid) electric vehicles. In this way, nanotechnology can bring innovations widely even with abundant carbon and silicon elements, and contributes to sustainable technological society.

But nanomaterials can never be made in macro-scale if we artificially manipulate atoms/molecules one-by-one. Self-organization, i.e. spontaneous formation of materials from numerous atoms/molecules, is the key. We are trying to understand the processes of chemical reactions of atoms/molecules, formation of nanostructures, and evolution of higher-order structures fundamentally. Based on the fundamental understandings with flexible thinking and idea, we are proposing and developing novel processes for nanomaterials and their devices.

Carbon Nanotubes

Carbon nanotubes (CNTs) are a unique 1D nanomaterial as thin as ~nm and as long as ~mm. They have good electrical conductivity, high tensile strength, thermal and chemical stability similarly with inorganic materials, and have small mass, flexibility, and compatibility with printing process similarly with organic materials. Thus, many applications have been proposed for them. On the other hand, as their price (higher than gold) shows, their fabrication process is still under development and their practical applications are very much limited. Chemistry & engineering should lead the innovations for their production and manufacturing. We have developed rapid growth process of millimeter-long single-wall CNTs and are trying to realize their practical production. Please click here for details. We are developing mass-production processes of CNTs by utilizing three-dimensional space of reactors, and direct fabrication of various devices by growing CNTs on device substrates. We have also started the synthesis of boron nitride nanotubes (BNNTs) having similar structure as CNTs and insulative property. Jianghua LANG (PD): Stable and continuous synthesis of carbon nanotubes by floating catalyst CVD with fluid mixing control. Pengfei CHEN (D3): Activation of alkane for CVD synthesis of CNTs. Wataru KITAHARA (M2): Morphology control of vertically aligned CNT films afor small X-ray tubes with enhanced life. Shun TANAKA (M1): Development of a safe and low-damage dry purification method for CNTs. Yuki NAOTSUKA (M1): Stable and continuous synthesis of carbon nanotubes by floating catalyst CVD with enhanced decomposition of catalyst sources Daiki KITAJIMA (B4): Coating of carbon nanotube with boron nitride for lithium-ion battery application.

Rapid SWCNT growth Larger Movie. Continuous production by fluidized bed: Movie

Functional Films

In many devices made of solids, the interface between solids often governs performance. As the performance of electrical and electronic devices increases dramatically, the density of energy input into the device increases, and how to dissipate the heat generated is an important issue. On the other hand, LEDs and sensors are mounted on various devices such as automobiles, and their anti-fog and anti-snow protection is also becoming important. Various types of thin films are required to connect solid interfaces and add functionality to surfaces. Strong chemical bonds create stiffness as well as heat resistance and chemical stability in ordinary bulk materials. On the other hand, CNTs and BNNTs are thin, one-dimensional materials with diameters of a few nm that have flexibility with strong and stable chemical bonds. They also have a large specific surface area and van der Waals interactions between nanotubes, which intertwine with each other in a sponge-like free-standing film. The material with unique features of softness, thermal stability, and thermal conductivity can be produced, and is expected to have diverse applications in solar cells, in-vehicle devices, and semiconductor device manufacturing. Evaporation of solids in an inert gas such as Ar allows the synthesis of solid particulates with a clean surface, and these particulate films easily sinter and return to the bulk. We have created novel materials with high thermal stability once bonded while bonding at low temperatures. Yoshihiro TAKAHASHI (M2): Low thermal resistance and high heat resistance interfacial bonding between solids. Ryosuke NAKAJIMA (M2): Stable p/n-doping of carbon nanotubes Naoumi HASUMI (M2): Development of CNT transparent heater by spray coating and liquid surface transfer. Koyo ANDO (B4): Synthesis of CNTs by floating catalyst CVD method and development of transparent thin films. Sakurako TACHIBANA (B4): Low-damage high-yield dispersion and filtration of CNTs to develop transparent thin films. Kentaro NAKA (B4): Creation of metal aerogel films by gas evaporation and particle deposition for interface bonding.

1-min-epitaxy and lift-off of Si films for solar cells

Rechargeable batteries

Energy devices must be produced at low cost and installed at large scale in order to contribute to the sustainable energy and environmental systems. We are developing next-generation, high energy and power density rechargeable batteries via rapid, high-yield fabrication process using low-cost sources. Self-supporting, sponge-like films of single-wall and few-wall CNTs can be easily obtained by dispersion and filtration. For example, 0.1 mm-thick paper of our few-wall CNTs by fluidized-bed CVD is as light as 0.3 mg/cm3 and 3 mg/cm2, has a 80-90% porosity and 100 S/cm electrical conductivity. Differently from the conventional electrodes fabricated by coating active materials on heavy current collectors of Cu or Al foils with binder and conductive fillers, we are developing light-weight, high-capacity electrodes by capturing various active materials in the CNT papers. Especially, Si has a huge theoretical capacity 10-times as large as the current graphite anode, however is suffering from the degradation due to the volumetric change during charge-discharge cycles. Vapor deposition is a common method in basic research in preparing thin films slowly and carefully under ultrahigh vacuum. But it enables rapid, low-cost fabrication of aluminum thin films for gas barriers in snack packaging in industry. We elevate the vapor pressure of the evaporation source by heating it to a temperature much higher than the melting point, deposit the vapor on substrates at lower temperature, and realize several micrometer-thick porous films quickly in 1 minute. We are applying this method also for various metals to realize high-performance battery electrodes via simple, low-cost processes.

1-min deposition of porous Si films for Li ion batteries

• Tomotaro MAE (Lecturer): Development and environmental impact assessment of high energy density Li secondary battery.
• S. NATARAJAN (PD): Upcycling of spent lithium ion batteries.
• Yihua TANG (PD): Creation of carbon scaffolds with spatially controlled sodiophilicity for sodium metal batteries.
• Ben HUANG (D3): Research on pre-lithiation and performance improvement of SiO anode materials for lithium ion batteries.
• Yukako OGINO (M2): Development of direct recycling technology of Co-free lithium ion battery cathode.
• Eun KO (M2): Structural control of CNT-based 3D current collector and its application to lithium polysulfide cathode.
• Chun Wen CHUNG (M1): Developmenet of SiO||S full cell using 3D current collector of CNTs.
• Masaya KAWAGUCHI (M1): Fluidized bed synthesis of long CNTs, CNT structure control and lithium-ion battery applications.
• Nobuhiro KURODA (M1): Development of direct recycling technology of NCM powders from spent lithium ion batteries.
• Junyi LIU (M1): Development of simple technology for separation and activation of NCM cathode material from spent lithium ion batteries.
• Aldo Gregarious DIONDIHON (B4): Development of direct recycling technology of NCA cathode of lithium ion battery.
• Soma ARAI (B4): Development of porous carbon-carbon nanotube composite materials by chemical vapor deposition for lithium ion battery anode.

Hydrogen Energy

(Hydrogen-Thermal)

• Keisuke YOSHIDA (D3/Reseach Associate): Design and demonstration of hydrogen-storage tank using MgH2-CNT composite material.
• Hajar abdullah yasir AL ABRI (M2): Energy-efficient catalytic production of hydrogen from ammonia.
• Ryota ZUKERAN (M2): Development of AB5-based hydrogen storage alloy-polymer resin structure for high-speed hydrogen absorption and desorption.
• Shota SATO (B4): Development of a simple synthesis process for catalyst-doped Mg hydrogen storage materials.
• Saori HAYASHI (B4): Establishment of a process for the preparation of Mg-CNT composite films with high cycle durability.
• Otoaki MAYANAGI (B4): High density H2 storage by LaNi5+MOF composite.

(Hydrogen-Electrochemical)

• Shunsuke OBANA (M2): Highly efficient hydrogen production via water electrolysis using layered double hydroxide catalysts and CNT three-dimensional electrodes
• Luke MURAKAMI (M2): Revealing cathodic reaction mechanism and enhancing current efficiency of liquid ammonia electrolysis
• Sara EBINA (M1): Development of anode and integrated cell for aqueous ammonia electrolysis.
• Hiroki RI (M1): Methanol oxidation using layered double hydroxide catalyst for hydrogen production via low-voltage water electrolysis.
• Riku WATANABE (M1): Direct urea synthesis by electrolysis from N2 and carbonate solution.
• Kanako UTADA (B4): Development of an anode catalyst for hydrogen production by electrolysis of liquid ammonia.

CO2-absorbing concrete

Assessment of Emerging Technologies

Previous Ph. D. Theses

• Tomotaro MAE "Development and green-house gas emission assessment of Li secondary battery using silicon monoxide-carbon nanotube self-supporting film anode," Waseda University (2024).
• Kentaro KANEKO "Development of battery architecture based on conducting and insulating nanotubes that enhances energy density and thermal stability," Waseda University (2023).
• Xiaoxu HUANG "Scale up and performance enhancement of carbon nanotube/silicon heterojunction solar cell using molybdenum oxide layer," Waseda University (2021).
• Rongbin XIE "Simple fabrication of silicon solar cells based on the heterojunction with carbon nanotubes," Waseda University (2020).
• Keisuke HORI, "LixSi-S battery with high energy densities based on three dimensional current collectors of carbon nanotubes," Waseda University (2020).
• Hiroyuki SHIRAE, "Fast, High-Yield Fabrication Processes of Low-Resistivity, Flexible Carbon Nanotube Films," Waseda University (2018).
• Ricardo QUINTERO RESTREPO, "Development of lightweight electrochemical capacitor electrodes based on a three dimensional carbon capturing capacitive particles," Univ. Tokyo (2015).
• Zhongming CHEN, "Development of production methods of submillimeter-long carbon nanotubes," Univ. Tokyo (2014).
• Kei HASEGAWA, "Millimeter-scale growth of single-walled carbon nanotubes on substrates," Univ. Tokyo (2011).
• Hisashi SUGIME, "Clarification of catalytic growth mechanism of single-walled carbon nanotubes and control of their synthesis," Univ. Tokyo (2010).
• Kazunori KAKEHI, "Growth of single- and multi-walled carbon nanotubes catalyzed by sputter-deposited metal nanoparticles," Univ. Tokyo (2008).

Previous Master Theses

• Misako OHASHI, "Development of fabrication technology of single crystal Si films by porous layer formation, rapid Si epitaxy and lift-off on/from single crystal Si wafers," Waseda University (2024).
• Junya OKA, "Production of silicon-activated carbon composite materials by chemical vapor deposition for negative electrode of lithium-ion battery," Waseda University (2024).
• Takazumi KAIDA, "Coating of Carbon Nanotubes with Boron Nitride for Application to Lithium-Ion Batteries," Waseda University (2024).
• Yurin KANAI, "Rapid formation of silver aerogel films by gas-evaporation and metal-ceramic interfacial bonding," Waseda University (2024).
• Takuma GOTO, "Development of damage-less dry-purification of carbon nanotubes using Br2 and FeCl3 vapors," Waseda University (2024).
• Kaito NAKAMAE, "Development and stable operation of high energy density Li-S batteries based on lithium polysulfide and carbon nanotubes," Waseda University (2024).
• Tomoki HAMASAWA, "Improvement of H2 absorption/desorption cycling stability of catalyst-loaded MgH2 by composition with carbon materials," Waseda University (2024).
• Sumire MIYAKOSHI, "Development of Ru-supported carbon nanotube film electrodes and electrolysis of liquid ammonia for hydrogen production," Waseda University (2024).
• Sota EBISU, "Synthesis of boron nitride nantoubes using boric acid as a boron source," Waseda University (2023).
• Yumi OSHIMA, "Development of anisotropic conductive film with sponge structure using cellulose nanofibers and silver particles," Waseda University (2023).
• Kana KUTSUNUGI, "Development of Ir-loaded carbon nanotube electrode for hydrogen production by ammonia electrolysis in aqueous solution," Waseda University (2023).
• Hiroki SAKURAI, "Development of simple fabrication and recycling technologies for metal oxide cathodes of lithium-ion batteries," Waseda University (2023).
• Itsuki CHIKAARASHI, "Continuous gas-phase synthesis and collection of single-wall carbon nanotubes via rapid heating of catalyst source," Waseda University (2023).
• Ki CHOU, "Life cycle assessment of lithium sulfur batteries and investigation of cycle stability improvement using carbon nanotubes," Waseda University (2023).
• Riko TOYAHARA, "Synthesis of long carbon nanotubes with controlled layer number by fluidized bed using catalyst prepared by chemical vapor deposition," Waseda University (2023).
• Shiori NAKAMURA, "Development of template-assisted fabrication method of self-supporting boron nitride nanotube thin films," Waseda University (2023).
• Yuua URATA, "Continuous production of nanoparticle-nanotube hybrid carbon material via high-temperature pyrolysis of acetylene," Waseda University (2022).
• Tetsuro SAWADA, "Synthesis of boron nitride nanotube by chemical vapor deposition from atomized boric acid solution," Waseda University (2022).
• Hiroto SHIRAKAWA, "Mist-deposition of catalyst for fluidized-bed production of carbon nanotubes," Waseda University (2022).
• Taiki NAGAMATSU, "Functionalization of carbon nanotube films for water electrolysis and conductive film," Waseda University (2022).
• Emina HARA, "Development and performance/stability evaluation of transparent heater based on polymer-acid-doped carbon nanotube," Waseda University (2022).
• Kotaro YASUI, "Fabrication and hierarchal structure control of carbon nanotube field electron emitters for X-ray tubes," Waseda University (2022).
• Shohei YAMAOKA, "Investigation of microstructure and chemical state of Nb oxide catalyst for hydrogen absorption property of Mg," Waseda University (2022).
• Naoki YAMAMOTO, "Utilizing vertically aligned carbon nanotube films for anode active material and cathode current collector of lithium ion batteries," Waseda University (2022).
• Kento YOKOI, "Thermal interface materials with high thermal stability/electrical insulation via orientation control of carbon nanotube/hexagonal boron nitride," Waseda University (2022).
• Keisuke YOSHIDA, "Development of heat supply and hydrogen absorption/desorption process by hydrogen flow to porous MgH2 sheet," Waseda University (2022).
• Neel PATIL, "Thermolysis of ammonia via resistive heating of double coiled filament for energy efficient hydrogen production," Waseda University (2021).
• Rei NAKAGAWA, "Understanding the effects of sulfur addition on the catalytic growth of carbon nanotubes," Waseda University (2021).
• Natsuho AKAGI, "Systematic investigation of anode catalysts in liquid ammonia electrolysis for hydrogen production," Waseda University (2021).
• Ryoya OTAHARA, "Flame synthesis of floating catalysts and gas-phase synthesis of carbon nanotubes," Waseda University (2021).
• Miho OKITSU, "Development of film-type sensors using carbon nanotubes and their simple fabrication process," Waseda University (2021).
• Kosuke KAJIWARA, "Fabrication of MgH2-catalyst-carbon nanotube composite and evaluation of its hydrogen storage performance," Waseda University (2021).
• Minami SUTO, "Development and assessment of production technology of crystalline silicon films toward solar cells of lower cost and environmental impacts," Waseda University (2021).
• Hiromu TAKAHASHI, "Synthesis of boron nitride nanotubes by chemical vapor deposition with controlled supply of boron source," Waseda University (2021).
• Hideaki TANAKA, "Development of dry-purification process of carbon nanotubes using halaide that stays solid at normal temperature and pressure," Waseda University (2021).
• Bozhi CHEN, "Synthesis of single-wall carbon nanotubes with small diameter and high crystallinity using Ni-Al-O nanopowder," Waseda University (2021).
• Tomotaro MAE, "Development of Li thin film negative electrode supported by carbon nanotubes for rechargeable battery with high stability and energy density," Waseda University (2021).
• Sebun MUNAKATA, "Creation of silver aerogel films by gas-evaporation and particle deposition for interface bonding," Waseda University (2021).
• Yuichi YOSHIE, "Development of thin film positive electrode of lithium polysulfide supported by carbon nanotubes and high energy density lithium-sulfur battery," Waseda University (2021).
• Pengfei CHEN, "Activation of alkane for synthesis of carbon nanotubes by chemical vapor deposition," Waseda University (2021).
• Mengju YANG, "Understanding and controlling the pyrolysis of C3H8 for uniform synthesis of vertically-aligned single-wall Carbon nanotube. vWaseda University (2020).
• Zihao ZHANG, "Enhanced gas-phase synthesis of single-wall carbon nanotubes in large yield with methane as feedstock," Waseda University (2020).
• Mayu ASAKA, "Direct synthesis of carbon nanotube arrays on aluminum substrates for heat-transfer applications," Waseda University (2020).
• Yuki KANAZAWA, "Thermal interface material of carbon fibers densely and vertically filled polymer resin sheet," Waseda University(2020).
• Kentaro KANEKO, "Secondary battery with high energy density and high thermal stability based on conductive and insulative nanotubes," Waseda University(2020).
• Yusuke KOHASE, "Electrolysis of ammonia using metal-supported carbon nanotube film electrode for hydrogen production," Waseda University(2020).
• Kaisheng FENG, "Continuous gas-phase synthesis of carbon nanotubes using floating-supported catalyst," Waseda University(2020).
• Go YAMAGATA, "Development of lithium ion batteries compatible with fast charge/discharge using three-dimensional current collectors of carbon nanotubes," Waseda University (2019).
• Naoya ISHIJIMA, "Fabrication of large-grain polycrystalline Si films by rapid vapor deposition method and silicon solar cells by coating of conductive polymers," Waseda University (2019).
• Michiko EDO, "Synthesis of carbon nanotubes with controlled structure and investigation on catalysis mechanisms," Waseda University (2019).
• Kei OHASHI, "Conversion of metal thin films to graphene via reaction with chloroform on insulator substrates," Waseda University (2019).
• Sae KITAGAWA, "Fast fabrication process and morphology-control of electron emitters of carbon nanotubes for X-ray tubes," Waseda University (2019).
• Toshihiro SATO, "Understanding and engineering of catalytic growth of long CNTs on substrates," Waseda University (2019).
• Tatsuya TOMINAGA, "Development of carbon nanotube-Al foil composite and its application to energy devices," Waseda University (2019).
• Katsuya NAMIKI, "Continuous production of single-wall carbon nanotubes by floating catalyst chemical vapor deposition - Analysis of reaction and flow fields and improvement of catalyst formation," Waseda University (2019).
• Yuta HASHIZUME, "Fabrication of silicon-carbon nanotube self-supporting films and their performance as LiB anode," Waseda University (2019).
• Yohei MAEDA, "Development of continuous gas-hase production method of acetylene-black-carbon nanotube hybrids," Waseda University (2019).
• Risa MAEDA, "Fast solution-based catalyst deposition on beads and fluidized-bed production of carbon nanotubes," Waseda University (2019).
• Masahiro YOSHIDA, "In situ dry-deposition of catalyst on ceramic powder and fluidized-bed production of long carbon nanotubes," Waseda University (2019).
• Shohei OKADA, "Flame synthesis of single-wall carbon nanotubes: Improving quanlity and quality via feed and reaction-field control," Waseda University (2018).
• Sohki KUZUHARA, "Asymmetric electrochemical capacitor of MnO2 and activated carbon electrodes based on self-supporting carbon nanotube films," Waseda University (2018).
• Shunji KOBAYASHI, "Creation of metal nanoparticle-caarbon nanotube hybrids for thermal interface materials," Waseda University (2018).
• Yukuya NAGAI, "Developing synthetic process of graphene with saved time and resources," Waseda University (2018).
• Kohki HAMADA, "Developing dry-purification process of carbon nanotubes," Waseda University (2018).
• Makoto FUJITA, "On-substrate fabrication of large-grain, polycrystalline silicon films by rapid vapor deposition: Assessing technology and developing separation technology" Waseda University (2018).
• Yoichiro HONDA, "Developing lithium ion battery anode of self-supporting composite film of lithium titanate and carbon nanotube," Waseda University (2018).
• Shigeki AOI, "Integrated films of Si-based active materials, carbon nanotubes, and Cu current collector by rapid vapor deposition for Li secondary batteries," Waseda University (2017).
• Sachie AKIBA, "Direct formation and structural control of multi-layer graphene films on SiO2 substrates by "etching-precipitation" method," Waseda University (2017).
• Naiao XU, "Fabrication and structure control of graphene oxide-carbon nanotube hybrid films for electrochemical capacitor electrodes," Waseda University (2017).
• Takayuki KOWASE, "A-few-second synthesis of silicon nanoparticles by gas evaporation and capturing them in carbon nanotube matrices for lithium secondary battery anodes," Waseda University (2017).
• Mami TAKABATAKE, "Growth of carbon nanotube pillars on substrate and their application to anisotropic conductive films," Waseda University (2017).
• Soichiro HACHIYA, "Fluidized-bed synthesis of long carbon nanotubes at high-yield from concentrated ethylene source," Waseda University (2017).
• Keisuke HORI, "Carbon nanotube sponge-based sulfur cathodes for lithium-sulfur batteries," Waseda University (2017).
• Eri MURAMOTO, "Process and cell structure for practical production of carbon nanotube-silicon solar cells," Waseda University (2017).
• Ryo YAMADA, "Thermal interface materials of vertically aligned carbon fibers embedded densely in polymer matrix," Waseda University (2017).
• Ittetsu OHBA, "Suspending supported catalysts in the gas-phase and continuous production of carbon nanotubes," Waseda University (2016).
• Kosuke KAWABATA, "Gas-phase deposition of catalyst on fine ceramic powders and fluidized-bed production of carbon nanotubes," Waseda University (2016).
• Yuri KISHIDA, "Direct formation of graphene on SiO₂ substrates by dissolving carbon in Co films and etching Co by Cl₂," Waseda University (2016).
• Masaaki KURIYA, "Development of seamless gas-phase production process of acetylene black-carbon nanotube hybrids," Waseda University (2016).
• Yusuke SUGINO, "Formation of floating-supported catalysts in the gas-phase and continuous production of carbon nanotubes," Waseda University (2016).
• Noriyoshi NAKAMURA, "Catalyst particle formation by rapid heating and cooling of ferrocene and gas-phase continuous production of carbon nanotubes," Waseda University (2016).
• Misato NARUBAYASHI, "Development of electrochemical capacitor electrodes by hybridizing self-supporting films of carbon nanotubes with MnO₂ particles," Waseda University (2016).
• Kohtaro YAMAGUCHI, "Interface and seed control of solid-phase growth of graphene and gas-phase growth of carbon nanotubes," Waseda University (2016).
• Yuhei YAMASAKI, "Fabrication of large-grain crystalline Si thin films by rapid vapor deposition with in situ melt-crystallization," Waseda University (2016).
• Yu YOSHIHARA, "Fabrication and control of carbon nanotube structures via gas- and liquid-phase processes," Waseda University (2016).
• Asahi OHKAWA, "Development of practical CVD synthesis and transfer processes of graphene," Waseda University (2015).
• Hiroyuki SHIRAE, "Loss-free fabrication process of highly-conductive, flexible CNT films," Waseda University (2015).
• Nan FANG, "Rapid vapor deposition and electrochemical evaluation of porous Si films on flexible current collectors for Li secondary battery anodes," Waseda University (2015).
• Mai YAMAGUCHI, "Flame synthesis of single-wall carbon nanotube and control over the temperature field and reactions," Waseda University (2015).
• Masaki KOSAKA, "Direct fabrication of metal-free graphene on substrates and its structural control," Univ. Tokyo (2014).
• Yusuke KON, "Development of fluidized-bed process for synthesis of single-wall carbon nanotubes," Univ. Tokyo (2013).
• Kosuke HIROTA, "Fabrication of large-diameter crystalline silicon thin films for solar-cells by rapid vapor deposition method," Univ. Tokyo (2013).
• Tatsuya MASUDA, "Control of crystal growth of graphene via chemical vapor deposition using copper catalysts in face-to-face layout," Univ. Tokyo (2013).
• Jun OHSHIMA, "Flame synthesis of single-wall carbon nanotubes," Univ. Tokyo (2011).
• Yoshikuni SATO, "Gas-phase synthesis of single-wall carbon nanotubes and their structure control," Univ. Tokyo (2011).
• Nu-Ri NA, "Low temperature growth of vertically aligned dense carbon nanotube arrays on substrates," Univ. Tokyo (2011).
• Kotaro SEKIGUCHI, "Instant implementation of carbon nanotube field emitters by pulse-current heating CVD," Univ. Tokyo (2011).
• Soichiro TAKANO, "Direct fabrication of metal-free graphene films on substrates," Univ. Tokyo (2011).
• Kyu-Ha LEE, "Fabrication of dense FePt nanorod arrays by separation of sputtered polycrystalline films at their grain boundaries," Univ. Tokyo (2011).
• Heunku KANG, "Fabrication of graphene from amorphous carbon by metal-induced crystallization and crystal growth mechanism," Univ. Tokyo (2011).
• Suarpa KETPREECHASAWAT, "Self-organized networks of carbon nanotubes and their transparent conducting properties (2010).
• Sang Wook PARK, "Sustainable centimeter-scale growth of carbon nanotubes," Univ. Tokyo (2010).
• Yoko ISHITSUKA, "Gas-phase synthesis of single-walled carbon nanotubes by gas-suspended catalysts and their growth mechanism," Univ. Tokyo (2010).
• Yukie TSUJI, "Structural control of polycrystalline cobalt silicide thin films," Univ. Tokyo (2010).
• Keisuke NOMURA, "Development of catalysts for low temperature growth of carbon nanotubes," Univ. Tokyo (2010).
• Takashi SHIRAI, "Low temperature growth of carbon nanotubes and their dense growth by thin-film catalysts (2009).
• F. Kanyiri MUNGAI, "Rapid epitaxial growth and lift-off process for fabrication of single-crystalline silicon thin films for solar cells," Univ. Tokyo (2009).
• Shingo MOROKUMA, "Development of Si thin film anode for Li ion secondary battery," Univ. Tokyo (2009).
• Ryuhei ITO, "Separate control of the gas-phase and catalytic reactions in catalytic CVD synthesis of carbon nanotubes," Univ. Tokyo (2008).
• Satoshi TAKASHIMA, "Understanding of Cu deposition mechanism under chlorine atmosphere and development of via-filling process," Univ. Tokyo (2008).
• Kei HASEGAWA, "Rapid growth of single-walled carbon nanotubes on substrate by thermal CVD method," Univ. Tokyo (2008).
• Hiroshi OHSHIMA, "Synthesis and characterization of amorphous silica film showing phase transition from semiconductor to insulator," Univ. Tokyo (2007).
• Yuichi KUWAHARA, "Fabrication of crystalline silicon thin films for solar cells by epitaxial lift-off method (2007).
• Hisashi SUGIME, "Combinatorial screening of catalysts and basics and control of single-walled carbon nanotube growth," Univ. Tokyo (2007).
• Azusa MORISHITA, "Grain boundary control of sputtered, magnetic FePt nanocrystalline thin films," Univ. Tokyo (2007).

Previous Bachelor Theses

• Nobuhiro KURODA "Development of direct recycling technology of NCM powders from spent lithium ion batteries," Waseda University (2024).
• Sara EBINA, "Investigation of the fabrication process of Ir-supported carbon nanotube film electrode for ammonia electrolysis in aqueous solution for hydrogen production," Waseda University (2024).
• Masaya KAWAGUCHI, "Development of high-temperature operating Li metal rechargeable battery using multiple types of carbon nanotubes as three-dimensional current collectors," Waseda University (2024).
• Shun TANAKA, "Development of a dry purification method of carbon nanotubes using I2 vapor," Waseda University (2024).
• Karin TERASHIMA, "Low-damage dispersion of boron nitride nanotubes and fabrication of transparent self-supporting thin films," Waseda University (2024).
• Yuki NAOTSUKA, "Stable and continuous synthesis of carbon nanotubes by floating catalyst CVD with enhanced decomposition of catalyst sources," Waseda University (2024).
• Daisuke MOTOHASHI, "In-situ measurement of CO2 absorption in a CO2-absorbing cement admixture using a flow reactor," Waseda University (2024).
• Yui MORIOKA, "Preparation of Mg nanoparticle hydrogen storage materials by arc discharge and simple catalyst deposition method using NbCl5," Waseda University (2024).
• Hiroki RI, "Water-methanol co-electrolysis using layered double hydroxide catalysts for efficient hydrogen production," Waseda University (2024).
• Junyi LIU, "Simple separation and regeneration technology for spent lithium-ion battery NCM cathode materials," Waseda University (2024).
• Riku WATANABE, "Synthesis of nitrogen-containing organic compounds by electrolysis using aqueous carbonate solutions for CO2 fixation," Waseda University (2024).
• Kazuo OHNO, "Investigation of simple catalyst addition process to Mg nanoparticle hydrogen storage materials," Waseda University (2023).
• Yukako OGINO, "Development of composite films of boron nitride nanotubes and solid electrolytes for all solid-state batteries," Waseda University (2023).
• Shunsuke OBANA, "Development of layered double hydroxide catalysts for highly efficient hydrogen production in water electrolysis," Waseda University (2023).
• Wataru KITAHARA, "Pattern and uniformity control of vertically aligned carbon nanotubes and performance improvement of field electron emitters," Waseda University (2023).
• Eun KO, "Development of composite films of aligned carbon nanotubes and vapor-deposited aluminum and their application to lithium sulfur batteries," Waseda University (2023).
• Ryota ZUKERAN, "Development of LaNi5-resin composite for fast absorption and desorption of hydrogen and evaluation of heat conduction properties," Waseda University (2023).
• Misuzu TAKASE, "Analysis of CO2 absorption rate of CO2-absorbing concrete admixture," Waseda University (2023).
• Yoshihiro TAKAHASHI, "Development of thermally stable thermal interface materials using thermosetting resin," Waseda University (2023).
• Ryosuke NAKAJIMA, "Investigation of stable n-doping of carbon nanotubes using anion exchange resin," Waseda University (2023).
• Naoumi HASUMI, "Dispersion and liquid surface transfer of carbon nanotubes for transparent heaters," Waseda University (2023).
• Luke MURAKAMI, "Effect of cathodic side reaction on current efficiency of hydrogen generation in liquid ammonia electrolysis," Waseda University (2023).
• Hajar abdullah yasir AL ABRI, "Thermolysis of Ammonia Via Resistive Heating with Reduced Heat Loss and Improved Gas Contact for Energy-Efficient Hydrogen Production," Waseda University (2022).
• Vincentius WILSON, "In-depth analysis of the carbonation of -C2S for the new ecological concrete that reduces CO2 emission below zero level," Waseda University (2022).
• Misako OHASHI, "Fabrication of single-crystalline silicon films at low environmental burden and their solar cell applications," Waseda University (2022).
• Junya OKA, "Synthesis of freestanding films of highly crystalline graphene using molten metal catalysts," Waseda University (2022).
• Takazumi KAIDA, "Controlled supply of boron oxide vapor via reaction of solid boron with water vapor for synthesis of boron nitride nanotubes by chemical vapor deposition," Waseda University (2022).
• Yurin KANAI, "Creation of Ag aerogel films by gas evaporation and particle deposition for interface bonding," Waseda University (2022).
• Takao KOZAKA, "Development and characterization of LaNi5-polymer resin structures for high-rate hydrogen absorption and desorption," Waseda University (2022).
• Takuma GOTO, "Development of a low-damage purification method for carbon nanotubes using FeCl3 vapor," Waseda University (2022).
• Kaito NAKAMAE, "Development of high energy density Li-S batteries by loading active materials and salts onto carbon nanotube films," Waseda University (2022).
• Tomoki HAMASAWA, "Improvement of hydrogen absorption and desorption cycling stability of catalyst-doped MgH2 by carbon materials," Waseda University (2022).
• Sumire MIYAKOSHI, "Liquid ammonia electrolysis on Ru nanoparticle-supported carbon nanotube film electrodes for highly efficient hydrogen production," Waseda University (2022).
• Sota EBISU, "Synthesis of boron nitride nanotubes with boron-source mist for floating catalyst chemical vapor deposition," Waseda University (2021).
• Yumi OSHIMA, "Fabrication of anisotropic conductive film with sponge structure by compositing silver particles and cellulose nanofibers," Waseda University (2021).
• Kana KUTSUNUGI, "Investigation of binary catalysts for reducing overvoltage in aqueous ammonia electrolysis for hydrogen production," Waseda University (2021).
• Hiroki SAKURAI, "Composite of metal oxides and carbon nanotubes for lithium-ion battery positive electrode," Waseda University (2021).
• Ryuichi SASAKI, "Relationship between current efficiency and side reactions on cathode in liquid ammonia electrolysis for hydrogen production," Waseda University (2021).
• Itsuki CHIKAARASHI, "Continuous gas-phase synthesis and recovery of highly crystalline single-wall carbon nanotubes by rapid heating of catalyst feedstock," Waseda University (2021).
• Ki CHOU, "Development of carbon nanotube-based active materials for lithium-ion battery anodes, Waseda University (2021).
• Riko TOYAHARA, "Supporting catalysts by chemical vapor deposition for layer number control and high-yield synthesis of carbon nanotubes by fluidized bed," Waseda University (2021).
• Shinichiro NAKAGAWA, "Fabrication of hydrogen storage alloy LaNi5-polymer resin composite for high-rate hydrogen storage and release," Waseda University (2021).
• Shiori NAKAMURA, "Direct synthesis of graphene on insulating substrates using chloroform," Waseda University (2021).
• Tomoya WAKOU, "Partial delithiation of LixSi-CNT negative electrode to enhance life of lithium secondary batteries," Waseda University (2021).
• Takafumi KUSAKABE, "Innovative cascaded life cycle strategies to reduce the environmental impact of lithium-ion battery (LIB)," Waseda University (2020).
• Tetsuro SAWADA, "Synthesis of boron nitride nanotubes by chemical vapor deposition using boric acid," Waseda University(2020).
• Yuua URATA, "Continuous synthesis of carbon nanoparticle-nanotube composite by high-temperature pyrolysis of acetylene," Waseda University(2020).
• Hiroto SHIRAKAWA, "Catalyst deposition using mist of metal nitrate solution for fluidized-bed synthesis of long carbon nanotubes," Waseda University(2020).
• Arin TATSUKAWA, "Feeding of metalorganic vapors, depositing catalyst, and synthesizing long carbon nanotubes by fluidized bed," Waseda University(2020).
• Taiki NAGAMATSU, "Development of three-dimensional electrode based on carbon nanotube film for highly efficient alkaline water electrolysis," Waseda University(2020).
• Emina HARA, "Development of heterojunction solar cell by coating organic semiconductor on crystalline silicon films," Waseda University(2020).
• Kotaro YASUI, "Facile fabrication and performance enhancement of carbon nanotube electron emitters for X-ray tubes," Waseda University(2020).
• Shohei YAMAOKA, "Synthesis of Mg nanoparticles and catalysis mechanism of metal oxides for hydrogen storage," Waseda University(2020).
• Shunta YAMAGUCHI, "Fabrication of LaNi5-expanded graphite composite and evaluation of its hydrogen storage performance," Waseda University(2020).
• Naoki YAMAMOTO, "Development of lithium metal negative electrode using self-supporting composite film of hard carbon and carbon nanotube as a matrix," Waseda University(2020).
• Kento YOKOI, "Development of electrically resistive thermal interface materials using platelet particles of boron nitride," Waseda University(2020).
• Keisuke YOSHIDA, "Simulation study of heat supply and hydrogen desorption by flowing hydrogen through metal hydride," Waseda University(2020).
• Neel PATIL "Thermolysis of Ammonia via Resistive Heating of Nickel Catalysts for Energy Efficient Hydrogen Production," Waseda University (2019).

• Hiromu TAKAHASHI, "Source materials and reaction conditions for boron nitride nanotubes by chemical vapor deposition," Waseda University (2018).
• Mizuki MORI, "Novel synthesis method of free-standing graphene films," Waseda University (2019).
• Pengfei CHEN, "Activation of alkane for CVD synthesis of CNTs," Waseda University (2019).
• Natsuho AKAGI, "Searching for anode catalysts for hydrogen production by liquid ammonia electrolysis," Waseda University (2019).
• Ryoya OTAHARA, "Low-temperature, gas-phase synthesis of single-wall carbon nanotubes by high-density floating catalyst," Waseda University (2019).
• Miho OKITSU, "Development of high-sensitivity film-type sensor based on carbon nanotubes by simple processes," Waseda University (2019).
• Kosuke KAJIWARA, "Fabrication of MgH2-carbon nanotube composites and their hydrogen strorage properties," Waseda University (2019).
• Minami SUTO, "Rapid fabrication of large-grain, polycrystalline Si films for solar cell application," Waseda University (2019).
• Tomohiro SEI, "CVD method for synthesis of long boron nitride nanotubes," Waseda University (2019).
• Hideaki TANAKA, "Development of novel dry purification method of carbon nanotubes by removing catalyst metals," Waseda University (2019).
• Bozhi CHEN, "Synthesis of small-diameter, high-crystallinity single-wall carbon nanotubes using Ni-Al-O nanopowder," Waseda University (2019).
• Tomotaro MAE, "Development of high-performance lithium metal anode by nucleation control using metal nanoparticle-supported carbon nanotubes," Waseda University (2019).
• Seven MUNAKATA, "Creation of metal aerogels by gas-evaporation for interface bonding," Waseda University (2019).
• Yuichi YOSHIE, "Developing cathodes for Li-S battery using self-supporting films of MnO2-supported carbon nanotubes," Waseda University (2019).
• Rei NAKAGAWA, "The effects of gadolinium on the synthesis of long vertically aligned carbon nanotubes," Waseda University (2018).

• Mayu ASAKA, "Synthesis of carbon nanotubes on aluminum sheets, fasile morphology control, and heat-transfer application," Waseda University (2018).
• Yuki KANAZAWA, "Filling carbon nanotubes with vertical aligment and high density in polymer resin sheets for thermal interface materials," Waseda University (2018).
• Kentaro KANEKO, "Developing nanotube/nanofiber films of separator and cathode/separator/anode unit for secondary batteries," Waseda University (2018).
• Satoru KAWAKAMI, "Developing anosotropic conductive films via hybridization of nanofibers with metal particles," Waseda University (2018).
• Yusuke KOHASE, "Electrolysis of aqueous ammonia using platinum nanoparticle-carbon nanotube electrodes," Waseda University (2018).
• Kazuya TAKAHASHI, "Direct synthesis of graphene on insulative substrates," Waseda University (2018).
• Kazuya TSUNODA, "Developing hybrid films of disk-like silicon particles and carbon nanotubes for lithium secondary battery," Waseda University (2018).
• Kaisheng FENG, "Gas-phase continuous synthesis of carbon nanotubes using floating-supported catalyst," Waseda University (2018).
• Gaiya OGAWA, "Floating catalyst chemical vapor deposition method for mass production of small-diameter carbon nanotubes," Waseda University (2017).
• Naoya ISHIJIMA, "Fabrication of large-grain polycrystalline Si thin films for CNT-Si heterojunction flexible solar cells," Waseda University (2017).
• Michiko EDO, "Chirality-selective synthesis of single-wall carbon nanotubes by using binary combinatorial method," Waseda University (2017).
• Kei OHASHI, "Direct synthesis of graphene on substrates by etching-precipitation method and evaluation of catalyst metals," Waseda University (2017).
• Sae KITAGAWA, "On-substrate synthesis of carbon nanotubes, morphology control by self-organization, and application to electron emitters," Waseda University (2017).
• Toshihiro SATO, "Stabilizing carbon nanotube synthesis by oxidizing additives: H₂O vs CO₂," Waseda University (2017).
• Tatsuya TOMINAGA, "Development of carbon nanotube-Al foil composite current collectors for electrochemical capacitors," Waseda University (2017).
• Katsuya NAMIKI, "Continuous synthesis of single-wall carbon nanotubes and their fibrous assembly by floating catalyst chemical vapor deposition method," Waseda University (2017).
• Shota MIURA, "Morphology controlled synthesis of carbon nanotube arrays on aluminum substrates for heat-transfer application," Waseda University (2017).
• Yuta HASHIZUME, "Fabrication of self-supporting Si/metal/Si films by rapid vapor deposition for lithium secondary batteries," Waseda University (2017).
• Yohei MAEDA, "Continuous synthesis of acetylene black and carbon nanotube hybrid in gas phase," Waseda University (2017).
• Risa MAEDA, "Wet Preparation of catalysts on beads for fluidized-bed synthesis of carbon nanotubes," Waseda University (2017).
• Masahiro YOSHIDA, "Gas-phase deposition of catalyst on ceramic beads for fluidized-bed synthesis of long carbon nanotubes," Waseda University (2017).
• Masaru YOKOO, "Development of integrated separator-current collector for lithium ion batteries," Waseda University (2017).

• Shohei OKADA, "Flame synthesis of carbon nanotubes with controlled gas-mixing," Waseda University (2016).
• Sohki KUZUHARA, "Development of electrode for oxygen reduction by hybridization of carbon nanotubes with zirconium oxide," Waseda University (2016).
• Shunji KOBAYASHI, "Fabrication and structure control of vertically aligned carbon nanotubes on Cu foils for thermal interface materials," Waseda University (2016).
• Yukuya NAGAI, "Synthesis of graphene from Sn-containing organic molecules and carbon monoxide," Waseda University (2016).
• Kohki HAMADA, "Purification of carbon nanotubes by dry-process and formation of hexagonal boron nitride on substrates," Waseda University (2016).
• Makoto FUJITA, "Fabrication of polycrystalline silicon films by vapor deposition of liquid and their separation from growth substrates," Waseda University (2016).
• Yoichiro HONDA, "Fabrication of aluminum-carbon nanotube hybrid foils by rapid vapor deposition and their application to electrodes in electric storage devices," Waseda University (2016).
• Taisuke MINAMIDE, "Fabrication of epitaxial Cu films by rapid vapor deposition and their use for controlled synthesis of graphene," Waseda University (2016).
• Kohei MIYADERA, "Trial of metal-foil-less capacitors based on carbon nanotube current collectors," Waseda University (2016).
• Go YAMAGATA, "Development of hybrid film of carbon nanotubes and lithium iron phosphate for lithium ion battery cathodes," Waseda University (2016).
• Ryo WATANABE, "Development of transfer process of graphene for graphene-silicon solar cells," Waseda University (2016).
• Shigeki AOI, "Rapid vapor deposition of Cu films for Li secondary batteries," Waseda University (2015).
• Sachie AKIBA, "Direct fabrication and structural control of few-layer graphene on substrates by etching-precipitation method," Waseda University (2015).
• Naiao XU, "Hybrid electrodes of graphene oxide with carbon nanotubes for electrochemical capacitors," Waseda University (2015).
• Takayuki KOWASE, "Gas-phase synthesis of silicon nanoparticles by evaporation method and fabrication of thick 3D anodes for Li secondary batteries," Waseda University (2015).
• Mami TAKABATAKE, "Resistivity reduction and mechanism of various carbon materials by Br2-doping," Waseda University (2015).
• Soichiro HACHIYA, "Synthesis of carbon nanotubes on powders by fluidized bed and their total collection by gas flow," Waseda University (2015).
• Keisuke HORI,"CNT-sponge-base cathodes capturing sulfur for Li-S batteries," Waseda University (2015).
• Eri MURAMOTO, "Structure requirements and optimization of solar cells based on crystalline Si coated with CNTs," Waseda University (2015).
• Yusuke MORIKAWA, "Direct fabrication of silicon particle films on current collectors for Li secondary batteries," Waseda University (2015).
• Ryo YAMADA, "Loss-free printing of flexible carbon nanotube films with controlled patterns," Waseda University (2015).
• Ittetsu OHBA, "Creation of aerosol supported catalyst from colloidal solution and gas-phase synthesis of carbon nanotubes," Waseda Univ. (2014).
• Kosuke KAWABATA, "Synthesis of submillimeter-long carbon nanotubes using catalysts by impregnation," Waseda Univ. (2014).
• Yuri KISHIDA, "Direct synthesis of graphene on dielectric substrates from Co-C mixture films by etching-precipitation method," Waseda Univ. (2014).
• Masaaki KURIYA, "Hybrid formation through carbon nanotube growth on acetylene black particles and reaction control in 1-second time scale ," Waseda Univ. (2014).
• Yusuke SUGINO, "Creation of aerosol supported catalyst from catalyst salt solution and gas-phase synthesis of carbon nanotube," Waseda Univ. (2014).
• Noriyoshi NAKAMURA, "Continuous production of carbon nanotubes using arc-discharge and gaseous carbon source," Waseda Univ. (2014).
• Misato NARUBAYASHI, "Fabrication of hybrid electrodes of self-supporting carbon nanotube films with MnO2 particles for electrochemical capacitors," Waseda Univ. (2014).
• Kohtaro YAMAGUCHI, "Fabrication and structure control of graphene thin films by gas-phase and solid-phase processes," Waseda Univ. (2014).
• Yuhei YAMASAKI, "Fabrication method of crystalline silicon thin films for flexible solar cells ," Waseda Univ. (2014).
• Yu YOSHIHARA, "Fabrication of Cu-C hybrid films by sputter-deposition and evaluation of their conductivity and current-carrying capacity," Waseda Univ. (2014).
• Asahi OHKAWA, "Transfer of graphene synthesized by CVD on catalysts and repeated use of the catalysts," Waseda Univ. (2013).
• Hiroyuki SHIRAE, "Facile fabrication of flexible wirings and transparent electrodes of carbon nanotubes," Waseda Univ. (2013).
• Nan FANG, "Rapid vapor deposition of silicon-based porous films for anodes of lithium ion batteries," Waseda Univ. (2013).
• Mai YAMAGUCHI, "Flame synthesis of single-wall carbon nanotubes," Waseda Univ. (2013).
• Kosuke HIROTA, "Fabrication of single-crystalline silicon thin films for solar cells by rapid vapor deposition and epitaxial lift-off methods," Univ. Tokyo (2011).
• Tatsuya MASUDA, "Fabrication and structural control of graphene by chemical vapor deposition using Cu thin film catalysts," Univ. Tokyo (2011).
• Yoshikuni SATO, "Gas-phase synthesis of single-walled carbon nanotube seeds," Univ. Tokyo (2010).
• Kotaro SEKIGUCHI, "Instant implementation of carbon nanotube field emitters by pulse-current heating (2009).
• Soichiro TAKANO, "Developing a selective filling method of micro-pores," Univ. Tokyo (2009).
• Yukie TSUJI, "Understanding and controlling crystal growth of cobalt silicide thin films for electronic devices (2008).
• Keisuke NOMURA, "Low temperature growth of carbon nanotubes by function-shared catalysts," Univ. Tokyo (2008).
• Shingo MOROKUMA, "Structural change of catalyst nanoparticles during carbon nanotube growth," Univ. Tokyo (2007).

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