Li Xiuting, Batchelor-McAuley Christopher, Shao Lidong, Sokolov Stanislav V, Young Neil P, Compton Richard G
Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University , Oxford OX1 3QZ, United Kingdom.
Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power , 2103 Pingliang Road, Shanghai 200090, P. R. China.
J Phys Chem Lett. 2017 Jan 19;8(2):507-511. doi: 10.1021/acs.jpclett.6b02899. Epub 2017 Jan 11.
A new methodology is developed to enable the measurement of the resistance across individual carbon nanotube-electrode contacts. Carbon nanotubes (CNTs) are suspended in the solution phase and occasionally contact the electrified interface, some of which bridge a micron-sized gap between two microbands of an interdigitated gold electrode. A potential difference is applied between the contacts and the magnitude of the current increase after the arrival of the CNT gives a measure of the resistance associated with the single CNT-gold contact. These experiments reveal the presence of a high contact resistance (∼50 MΩ), which significantly dominates the charge-transfer process. Further measurements on ensembles of CNTs made using a dilute layer of CNTs affixed to the interdigitated electrode surface and measured in the absence of solvent showed responses consistent with the same high value of contact resistance.
一种新的方法被开发出来，用于测量单个碳纳米管 - 电极接触点的电阻。碳纳米管（CNTs）悬浮在溶液相中，偶尔与带电界面接触，其中一些碳纳米管会跨越叉指金电极两个微带之间的微米级间隙。在接触点之间施加电位差，碳纳米管到达后电流增加的幅度给出了与单个碳纳米管 - 金接触相关的电阻测量值。这些实验揭示了存在高接触电阻（约50 MΩ），这在电荷转移过程中占主导地位。使用附着在叉指电极表面的稀碳纳米管层并在无溶剂情况下进行测量的碳纳米管集合体的进一步测量显示，响应与相同的高接触电阻值一致。
