Design and control of electron transport properties of single molecules
Design and control of electron transport properties of single molecules
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单分子电子传输特性的设计与控制
DOI：
10.1073/pnas.0903131106
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发表时间：
2009-09-08
影响因子：
11.1
通讯作者：
Hou, Jianguo
中科院分区：
文献类型：
--
作者：
Pan, Shuan;Fu, Qiang;Hou, Jianguo
我们在这个联合实验和理论研究中演示了如何通过执行一系列精心设计和良好控制的单分子化学过程来改变吸附在Cu（100）表面上的单个三聚氰胺分子的电子传输行为。结果发现，与脱氢反应，三聚氰胺分子成为牢固地结合到铜表面，并作为一个正常的导体控制的弹性电子隧穿。电流诱导的氢互变异构化过程导致不对称的三聚氰胺互变异构体，这又导致显著的整流效应。此外，通过开启非弹性多电子散射过程，可以以可调频率触发不对称互变异构体的两种构型之间的N-H键的机械振荡。总的来说，这种设计的分子在很宽的外部电压范围内同时表现出整流和开关功能。
We demonstrate in this joint experimental and theoretical study how one can alter electron transport behavior of a single melamine molecule adsorbed on a Cu (100) surface by performing a sequence of elegantly devised and well-controlled single molecular chemical processes. It is found that with a dehydrogenation reaction, the melamine molecule becomes firmly bonded onto the Cu surface and acts as a normal conductor controlled by elastic electron tunneling. A current-induced hydrogen tautomerization process results in an asymmetric melamine tautomer, which in turn leads to a significant rectifying effect. Furthermore, by switching on inelastic multielectron scattering processes, mechanical oscillations of an N-H bond between two configurations of the asymmetric tautomer can be triggered with tuneable frequency. Collectively, this designed molecule exhibits rectifying and switching functions simultaneously over a wide range of external voltage.