Thermally Activated Electron Transport in Single Redox Molecules

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• 作者：Xiulan Li ; Joshua Hihath ; Fang Chen ; Takuya Masuda ; Ling Zang ; Nongjian Tao
• 刊名：Journal of the American Chemical Society
• 出版年：2007
• 出版时间：September 19, 2007
• 年：2007
• 卷：129
• 期：37
• 页码：11535 - 11542
• 全文大小：362K
• 年卷期：v.129,no.37(September 19, 2007)
• ISSN：1520-5126

文摘

We have studied electron transport through single redox molecules, perylene tetracarboxylicdiimides, covalently bound to two gold electrodes via different linker groups, as a function of electrochemicalgate voltage and temperature in different solvents. The conductance of these molecules is sensitive to thelinker groups because of different electronic coupling strengths between the molecules and electrodes.The current through each of the molecules can be controlled reversibly over 2-3 orders of magnitude withthe gate and reaches a peak near the redox potential of the molecules. The similarity in the gate effect ofthese molecules indicates that they share the same transport mechanism. The temperature dependencemeasurement indicates that the electron transport is a thermally activated process. Both the gate effectand temperature dependence can be qualitatively described by a two-step sequential electron-transferprocess.