CNTs｜Preferential Synthesis of (6,4) Carbon Nanotubes through Catalyst Surface State Control
By introducing a high vacuum annealing process just before Plasma CVD to control the catalyst surface state, we have achieved, for the first time worldwide, the preferential synthesis of (6,4)-chirality carbon nanotubes, which has been challenging using any other methods. The (6,4) chirality is known for its high quantum efficiency compared to other nanotubes, making it promising for applications in optoelectronic devices. Furthermore, we explained the mechanism of the preferential synthesis of (6,4) chirality by considering the binding energy between nanotubes and the catalyst in the catalyst surface state. We believe this provides crucial insights for future chirality control. Scientific Reports, Vol. 7, No. 11149, pp. 1- 9, 2017.9.11.
https://www.tohoku.ac.jp/japanese/newimg/pressimg/tohokuuniv-press20170911_03web.pdf
CNTs｜Preferential Growth of (6,5) Carbon Nanotubes via Au Catalyst Plasma CVD
We discovered that incorporating low-catalytic activity Au catalysts into Plasma CVD allows for the preferential synthesis of (6,5)-chirality carbon nanotubes. Journal of the American Chemical Society, Vol. 132, No. 28, pp. 9570-9572, Jun. 2010.
CNTs｜Synthesis of Single-Walled Carbon Nanotubes with Narrow Chirality Distribution using Time-Controlled Plasma CVD
We utilized the capability of Plasma CVD to control synthesis time on a second-by-second basis to observe the synthesis-time evolution of the chirality distribution of carbon nanotubes. This revealed a clear chirality dependence in the incubation time before nucleation begins. By precisely controlling the synthesis time, we achieved the synthesis of monolayer carbon nanotubes with a narrow chirality distribution. ACS Nano, Vol. 4, No.12, pp 7395-7400, Nov. 2010.
CNTs｜Synthesis of Single-Walled Carbon Nanotubes via Plasma CVD
We have successfully synthesized monolayer carbon nanotubes using plasma-enhanced chemical vapor deposition (Plasma CVD) for the first time in the world. By minimizing the energy of ions incident on the catalyst and employing zeolite as the catalyst support material, we demonstrated, for the first time, the synthesis of monolayer carbon nanotubes using Plasma CVD, a process for which confirmation was previously limited to thermal CVD.
Chemical Physics Letters, Vol. 381, No. 3-4, pp. 422-426, 2003
Journal of the American Chemical Society, Vol. 130, No.25, pp.8101-8107, May. 2008.
