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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. (3D Synthesis) Mochen LI (PD): Fluidized-bed synthesis of long CNTs. Xiaoxu HUANG (D1): Synthesis of high-quality CNTs by floating catalyst CVD and application to CNT-Si heterojunction solar cells. Katsuya NAMIKI (M2): Continuous production of single-wall CNTs and their fibers by floating catalyst CVD method. Yohei MAEDA (M2): Development of gas-phase continuous production process of carbon nanoparticle-nanotube hybrids. Risa MAEDA (M2): Quick wet preparation of catalysts on ceramic powders and fluidized-bed synthesis of long CNTs. Masahiro YOSHIDA (M2): In situ dry preparation of catalysts on ceramic powders and fluidized-bed synthesis of long CNTs. Kaisheng FENG (M1): Continuous gas-phase synthesis of CNTs by floating supported catalyst. Zihao ZHANG (M1): Enhanced production of single-wall CNTs and their yarns by floating catalyst CVD method. Ryoya OTAHARA (B4): Gas-phase synthesis of CNTs by high-density floating catalyst. Bozhi CHEN (B4): Fluidized-bed synthesis of small-diameter carbon nanotubes using flame-synthesized nanopowder catalyst. (2D Synthesis & Applications) Michiko EDO (M2): Combinatorial screening of binary metal catalyst for chirality controlled synthesis of CNTs. Sae KITAGAWA (M2): Fabrication of self-organized CNT spike arrays for electron emitter application. Toshihiro SATO (M2): Understanding and engineering of catalytic growth of long CNTs on substrates. Mayu ASAKA (M1): On-aluminum synthesis, morphology control, and heat-transfer application of CNTs. Rei NAKAGAWA (M1): Catalysts and mechanisms for vertically aligned growth of long CNTs. Mengju YANG (M1): On-substrate synthesis of millimeter-tall, large-diameter single-wall CNTs. Tomohiro SEI (B4): Synthesis of long BNNTs. Hiromu TAKAHASHI (B4): Synthesis of long BNNTs. Pengfei CHEN (B4): Activation of alkane for CVD synthesis of CNTs.

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

Soft Films and Solar Cells

Strong chemical bonds make bulk materials stable and mechanically hard. Whereas CNTs and BNNTs, one dimensional materials with strong chemical bonds and a-few-nm diameters, are stable yet mechanically soft. They easily form self-supporting, sponge-like films owing to the large specific surface areas, strong van der Waals interaction, and high aspect ratio for interwoven structure. When we integrate materials into devices, it is important how to make connections between materials. Our goal is to connect the interfaces as we like using these soft nanomaterials. By the way, promoting the use of natural/renewable energy is essential to realize sustainable society. Japan has once been the leader for the solar cell technology and industry, however, we are now behind the world innovating this field. It is now widely recognized that renewable energy such as solar and wind powers are cheaper than nuclear and fire powers, there still remain vast areas with no electric power supply. Whether shall we install and use coal power plant or levelized renewable energy? The future will be much different. Various types of solar cells have been extensively researched, but the bulk crystalline silicon solar cells still account for >90% owing to their balanced cost, performance, reliability, and stability. Aiming at further cost reduction, we are developing a rapid vapor deposition process of highly crystalline Si films at >10 times larger area than the conventional Si substrates in 1 minute. We are also working on a simple cell fabrication process coating the Si film with CNTs and/or organic conductors. And we started technology assessment of their environmental, energy, and economical aspects. Rongbin XIE (D1): Simple fabrication of silicon solar cells based on heterojunction with carbon nanomaterials. Naoya ISHIJIMA (M2): Rapid vapor deposition of crystalline Si films and simple fabrication of flexible solar cells by coating Si with CNTs. Kei OHASHI (M2): Investigation of catalyst metals for direct synthesis of graphene on SiO2 substrates by etching-precipitation method. Yuki KANAZAWA (M1): Filling polymer sheet with high-density, vertically-aligned carbon fibers for thermal interface materials. Satoru KAWAKAMI (LD1/M1): Hybridization of nanofibers with metal particles for anisotropic conductive films. Mizuki MORI (B4): Novel synthesis method of free-standing graphene films. Minami SUTO (B4): Rapid fabrication of large-grain Si films for solar cells. Hideaki TANAKA (B4): Removing metals from CNTs and BNNTs by dry process. Seven MUNAKATA (B4): Creation of metal aerogel by in-gas evaporation for connection of solid interfaces.

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

Electrochemical materials and processes for energy

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. Hydrogen is expected as a clean secondary energy, which does not emit CO2 upon usage. Renewable energy is getting cheaper drastically, and large-scale production of CO2-free hydrogen is expected in future. However, breakthrough still is needed in its storage and transportation for their efficient use for production of energy and chemicals. Various technologies such as hydrogen storage alloys and hydrogen carriers have been researched, in which the chemical conversion of hydrogen via interfacial reaction is important. We are developing new materials by hybridization of hydrogen storage alloys and electrocatalysts with carbon nanotubes, and apparatuses and processes based on those materials. (Batteries) Keisuke HORI (D2): Development of high-capacity lithium secondary batteries by capturing high-capacity cathode and anode materials in CNT sponge films. Go YAMAGATA (M2): CNT-based hybrid electrodes of transition metal oxides for cathodes of Li ion batteries. Tatsuya TOMINAGA (M2): On-foil growth, structure control, and battery application of vertically-aligned CNTs. Yuta HASHIZUME (M2): Rapid vapor deposition of self-supporting Si/metal/Si films and their application to lithium secondary battery anodes. Kentaro KANEKO (M1): Creation of nanotube-based separator and cathode/separater/anode unit for secondary batteries. Tomotaro MAE (B4): Fast synthesis of Si nanoparticles and development of Si-CNT hybrid anode for lithium secondary battery. Yuichi YOSHIE (B4): Peformance improvement of CNT-based Li-S battery. (Electrochemistry) Yusuke KOHASE (M1): Nanoparticle catalyst supported on CNT sponge films for electrolysis of aqueous ammonia for hydrogen recovery. Natsuho AKAGI (B4): Electrolysis of liquid ammonia for hydrogen recovery. Miho OKITSU (B4): Simple yet highly-sensitive, CNT-based sensor. Kosuke KAJIWARA (B4): Alloy-CNT composite for efficient hydrogen storage. Takafumi KUSAKABE (B4): High-capacity electrochemical capacitor based on Ni(OH)2-CNT hybrid films. Neel PATIL (B4): Energy-efficient catalytic production of hydrogen from ammonia.

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

Previous Ph. D. Theses

• 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

• 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

• 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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