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Nanomaterials & Self-Organization
Nanotechnology brings innovations to the society
widely in energy/environment, information/communication, etc.,
by adding novel functions to materials by controlling their structures
at nanometer-scale. We are trying to establish the base of materials nanotechnology.
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 so that we are trying to
improve the efficiency several-ten times by making single-crystalline thin films.
Transparent electrodes are important for both solar cells (yielding electricity from light)
and displays & lightings (generating lights from electricity),
and we try to replace metal oxide semiconductors using rare-elements 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 if we use abundant carbon and silicon elements only,
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 fundamentally understand the processes of chemical reactions of atoms/molecules,
formation of nanostructures, and evolution of higher-order structures.
Based on the fundamental understandings with flexible thinking and idea,
we are proposing and developing novel processes for nanomaterials and their devices.
Carbon Nanotubes
Single-wall carbon nanotubes (SWCNTs) are a unique 1D nanomaterial quite thin ~nm and long ~mm.
Extensive research made in physics/science fields clarified
many unique properties and potential applications for them.
On the other hand, as their price (more expensive 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 SWCNTs
and are trying to realize their practical production.
We are also working on their applications, such to flexible electronics, solar cells,
secondary batteries/capacitors, etc.
Please click here for details.
- Ricardo QUINTERO RESTREPO (D3): Developing carbon-nanomaterials for supercapacitors.
- Zhongming CHEN (D2): Fluidized-bed production of CNTs and their application to secondary batteries.
- Nu-Ri NA(D2): Low temperature synthesis of dense CNT pillars, targeting at wiring in ULSI.
- Hiroyuki SHIRAE (M1): Formation of patterned CNT networks for flexible devices.
- Mai Yamaguchi (M1): Flame synthesis of single-wall CNTs.
- Ittetsu OHBA(B4): Gas-phase synthesis of carbon nanotubes via novel catalyst preparation method.
- Kosuke KAWABATA(B4): Fluidized-bed synthesis of long single-wall carbon nanotubes
- Masaaki KURIYA(B4): 1-second preparation of catalysts and 1-second growth of carbon nanotubes on carbon.
- Yusuke SUGINO(B4): Gas-phase synthesis of carbon nanotubes via novel catalyst preparation method.
- Noriyoshi NAKAMURA(B4): Coupling PVD and CVD methods for a novel synthesis method of single-wall carbon nanotubes.
- Misato NARUBAYASHI(B4): Application of self-standing CNT films to electrodes of capacitors and flexible devices.
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Rapid SWCNT growth
Larger Movie.
Continuous production by fluidized bed: Movie
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Graphene
Graphene is a unique 2D nanomaterial of a single atomic layer
having excellent conducting, transparent, and mechanical properties.
But their practical production method has not been developed yet.
We are developing new processes;
directly depositing graphene on substrates in order for its electronic device applications,
and producing high quality graphene at low cost in order for its applications to solar cells and touch panels.
- Masaki KOSAKA (M2): Direct fabrication of metal-free graphene on substrates
and structural control of graphene.
- Asahi OHKAWA (RS): Transfer of CVD-graphene in order for the repeated use of catalyst metals.
- Yuri KISHIDA(B4): Direct formation of graphene on substrates via "etching-precipitation" method.
- Kohtaro YAMAGUCHI(B4): Synthesis of graphene with controlled grain boundaries via "face-to-face" CVD method.
- Yu YOSHIHARA(B4): Creation of CNT-graphene hybrid materials for wiring applications.
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Silicon
Silicon is the base for the information society.
At the same time, it contributes to the renewable energy by realizing most solar cells.
Furthermore, it has a highest theoretical capacity as an anode for lithium ion batteries.
Carbon nanotubes and graphene are also expected to make a breakthrough for energy device performance.
Targeting at the contribution to the large-scale introduction of clean energy devices,
we are trying to realize large-scale and low cost production of high-performance materials
using abundant elements of carbon and silicon.
- Jungho LEE (D3): Rapid vapor deposition of porous Si films
and their application to lithium ion batteries.
- Nan FANG (M1): Rapid vapor deposition of Si alloys
and their application to lithium ion batteries.
- Yuhei YAMASAKI(B4): Rapid vapor deposition of silicon on carbon nanotube networks for solar cells
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1-min-epitaxy and lift-off of Si films for solar cells
1-min deposition of porous Si films for Li ion batteries
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Previous Ph. D. Theses
- 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
- 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
- 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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