| 研究実績の概要 |
Single-walled carbon nanotubes (SWCNTs) are the most promising candidate for the energy-efficient nanotransistors. However, there is a fundamental challenge to control the chirality, which intrinsically determines the SWCNTs to be metallic or semiconducting. In this project, it is proposed to “engineer” the chirality of individual SWCNTs. There are three goals: The first goal is to reveal the chirality transition mechanism. The second goal is to control the metal-to-semiconductor transition. The third goal is to fabricate nanotransistors by using the chirality-transformed semiconducting nanotubes as the channels.
Progresses have been made to transform the SWCNT chirality and to fabricate nanotube transistors. Using in situ transmission electron microscopy (TEM), we applied heating and mechanical strain to transform the local chirality to fabricate nanotube transistor. Quantum transport at room temperature was demonstrated for the fabricated nanotube transistors with a channel length as short as 2.8 nanometers. In addition, the temperature distribution of the Joule heated nanotube was investigated by in situ TEM electron energy-loss plasmon spectroscopy at nanometer resolution. Temperatures of over 2000 K were measured at the locally hot spot before the plastic deformation of the nanotube.
The research results have been published in top journals such as Science, Science Advances, ACS Nano, Carbon, and Nano Research.
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