2016 Fiscal Year Annual Research Report
Synthesis of small diameter single-walled carbon nanotubes and their application in Si heterojunction solar cells
| Project/Area Number |
15K17984
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| Research Institution | The University of Tokyo |
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Principal Investigator |
項 栄 東京大学, 大学院工学系研究科(工学部), 助教 (20740096)
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Keywords | single-walled CNT / catalyst / Co-W / chirality / solar cell |
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| Outline of Annual Research Achievements |
Synthesis of single walled carbon nanotubes (SWNTs) with well-defined atom arrangements is widely recognized in the past decades as the largest challenge in SWNTs community, and has become the bottleneck for the application of SWNTs in many fields, e.g. in nano-electronics and solar cells. A lot of efforts have been made recently years in Selective growth of semiconducting or metallic SWNTs, as well as the chirality specific growth. In second year of this project, we achieved a selective synthesis of (12, 6) with enrichment of 50%-70% by chemical vapor deposition (CVD) using sputtered Co-W as catalyst. These SWNTs are grown more uniformly on the entire substrate and are synthesized at much milder conditions than previous reports.
Meanwhile, in-plane transmission electron microscope (TEM) study suggests an intermediate structure of Co6W6C, which is strongly associated with the selective growth. However, we found most of W atoms disappear after a 5 min CVD growth, implying that anchoring W may be important in this mysterious Co-W system.(Nanoscale, (2016), 8, 14523-14529.)
A more detailed exploration on the catalyst structure during growth reveals a time-dependent evolution of Co-W structure. One meta-stable Co structure, which does not exist in phase diagram, is clearly identified.
These progresses in controlled growth and new understanding on the growth mechanism will be help to advance the application of SWNTs.
Future work will be focused on how to increase the purity and yield of growth, and how to assemble these SWNTs in solar cells.
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[Journal Article] , Chirality specific and spatially uniform synthesis of single-walled carbon nanotubes from sputtered Co-W bimetallic catalyst2016
Author(s)
H. An, A. Kumamoto, H. Takezaki, S. Ohyama, Y. Qian, T. Inoue, Y. Ikuhara, S. Chiashi, R. Xiang*, S. Maruyama*
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Journal Title
Nanoscale
Volume: 8
Pages: 14523-14529
DOI
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] Load Dependent Frictional Response of Vertically Aligned Single-Walled Carbon Nanotube Films,2016
Author(s)
A. Westover, J. Choi, K. Cui, T. Ishikawa, T. Inoue, R. Xiang, S. Chiashi, T. Kato, S. Maruyama*, C. Pint*,
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Journal Title
Scripta Mater.
Volume: 125
Pages: 63-67
DOI
Peer Reviewed / Int'l Joint Research
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[Journal Article] Epitaxial nucleation of CVD bilayer graphene on copper2016
Author(s)
Y. Song, J. Zhuang, M. Song, S. Yin, Y. Cheng, X. Zhang, M. Wang, R. Xiang, Y. Xia, S. Maruyama, P. Zhao*, F. Ding, H. Wang,
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Journal Title
Nanoscale
Volume: 8
Pages: 20001-20007.
DOI
Peer Reviewed / Int'l Joint Research
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[Journal Article] Room Temperature-processed Inverted Organic Solar Cells using High Working-Pressure-Sputtered ZnO film,2016
Author(s)
I. Jeon, Y. Qian, S. Nakao, D. Ogawa, R. Xiang, T. Inoue, S. Chiashi, T. Hasegawa, S. Maruyama*, Y. Matsuo*,
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Journal Title
J. Mater. Chem. A
Volume: 4
Pages: 18763-18768.
DOI
Peer Reviewed / Int'l Joint Research
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[Presentation] In-Plane TEM Imaging of Bimetallic Catalyst for SWNT Growth2016
Author(s)
Rong Xiang, Akihito Kumamoto, Hua An, Taiki Inoue, Shohei Chiashi, Yuichi Ikuhara, Shigeo Maruyama
Organizer
The 51st The Fullerenes-Nanotubes-Graphene General Symposium
Place of Presentation
Hokkaido citizens actives center (Sapporo, Hokkaido, Japan)
Year and Date
2016-09-07 – 2016-09-09
Int'l Joint Research
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