Electromechanical and conductance switching properties of single oligothiophene molecules.
Electromechanical and conductance switching properties of single oligothiophene molecules.
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DOI：
10.1021/nl050860j
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发表时间：
2005-06
期刊：
影响因子：
10.8
通讯作者：
Bingqian Xu;Xiulan Li;X. Xiao;H. Sakaguchi;Yuyuan Tian
中科院分区：
文献类型：
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作者：
Bingqian Xu;Xiulan Li;X. Xiao;H. Sakaguchi;Yuyuan Tian
我们研究了三个和四个噻吩环重复单元共价连接到两个金电极上的单一低聚硫吩类化合物的电子输运和机电性能。研究发现，四个重复单元分子比三个重复单元分子具有更强的导电性。这种不寻常的长度依赖关系是由于分子的不同电子态造成的。通过使用电化学门氧化和还原分子，这两个分子都可以在高导电性和低导电性之间进行可逆切换。分子的电导在拉伸时下降，这归因于力诱导的HOMO-LUMO能隙的增加。
We have studied the electron transport and electromechanical properties of single oligothiophenes with three and four thiophene repeating units covalently linked to two Au electrodes. The four-repeating unit molecule is found to be more conductive than the three-repeating unit molecule. This unusual length dependence is due to the different electronic states of the molecules. Both molecules can be switched reversibly between a high and low conducting state by oxidizing and reducing the molecules using an electrochemical gate. The conductance of the molecules decreases upon stretching, which is attributed to a force-induced increase in the HOMO-LUMO gap.