基于电化学方法研究以铜和银为电极的对苯二甲酸单分子结电导

doi:10.3866/PKU.WHXB201410223

Abstract

Abstract:

The single-molecule junction conductance of terephthalic acid binding to Cu andAg electrodes was measured by an electrochemical jump-to-contact scanning tunneling microscopy break junction (ECSTM-BJ) approach. The Cu andAg electrodes were formed in-situ, via electrodeposition froma solution. The conductance histograms of the single-molecule junctions formed via the binding of terephthalic acid to the Cu and Ag electrodes showed a well-defined shape, in the absence of any data selection. The single-molecule junction conductance values for the terephthalic acid binding to the Cu electrode were 11.5 nS (high conductance) and 4 nS (lowconductance), while the high and lowconductance values for theAg electrode were 10.3 and 3.8 nS, respectively. The high conductance values were typically approximately three times larger than the low conductance values, for both the Cu and the Ag electrodes. The conductance (G) value for the terephthalic acid followed the order of G_Cu>G_Ag, which indicated the different electronic coupling efficiencies between the molecule and electrodes. In contrast with the single set conductance value measured for alkanedicarboxylic acid using the same approach, two set conductance values were found for the terephthalic acid junctions with the Cu and Ag electrodes. These results illustrated the important role of the backbone of the chain in conductance measurements. The present work demonstrated the influence of the electrode and the molecular structure on the single-molecule junction conductance.

Key words: Scanning tunneling microscopy break junction, Single-molecule junction conductance, Electron transport, Cu, Ag

HAN Di, HONG Ze-Wen, LI Dong-Fang, ZHENG Ju-Fang, WANG Ya-Hao, ZHOU Xiao-Shun. Single-Molecule Junction Conductance of Terephthalic Acid Contacting Ag and Cu Electrodes Measured by an Electrochemical Method[J]. Acta Phys. -Chim. Sin. 2015, 31(1), 105-110. doi: 10.3866/PKU.WHXB201410223

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Single-Molecule Junction Conductance of Terephthalic Acid Contacting Ag and Cu Electrodes Measured by an Electrochemical Method

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