物理化学学报Issue(1)：105-110,6.DOI:10.3866/PKU.WHXB201410223
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
Single-Molecule Junction Conductance of Terephthalic Acid Contacting Ag and Cu Electrodes Measured by an Electrochemical Method
摘要
Abstract
The single-molecule junction conductance of terephthalic acid binding to Cu and Ag electrodes was measured by an electrochemical jump-to-contact scanning tunneling microscopy break junction (ECSTM-BJ) approach. The Cu and Ag electrodes were formed in-situ, via electrodeposition from a 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 (low conductance), while the high and low conductance values for the Ag electrode were 10.3 and 3.8 nS, respectively. The high conductance values were typical y 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 fol owed the order of GCu>GAg, 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.关键词
扫描隧道显微镜裂结法/单分子结电导/电子输运/铜/银Key words
Scanning tunneling microscopy break junction/Single-molecule junction conductance/Electron transport/Cu/Ag分类
化学化工引用本文复制引用
韩迪,洪泽文,李东方,郑菊芳,王亚浩,周小顺..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[J].物理化学学报,2015,(1):105-110,6.基金项目
The project was supported by the National Natural Science Foundation of China (21003110,21273204) and Planned Science and Technology Project of Zhejiang Province, China (2014C37102).国家自然科学基金(21003110,21273204)和浙江省科技厅(2014C37102)资助项目 （21003110,21273204）
