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

利用基于电化学跳跃接触的扫描隧道显微镜裂结法（ECSTM-BJ）,通过现场形成金属电极,对以Cu和Ag为电极的对苯二甲酸单分子结电导进行了测量.研究结果表明：利用该方法对所有数据直接线性统计即可得到很好结果;两种电极下都存在两套高和低电导值,其中以Cu为电极的单分子结电导高低值分别为11.5和4.0 n S,而以Ag为电极的单分子结电导分别为10.3和3.8 n S,高值都约为低值的3倍,且以Cu为电极的单分子结电导要略大于以Ag为电极的电导,可归结于电极和分子的耦合不同造成的.与同样条件下测量得到的烷基链羧酸单分子结电导只存在一套值相比,对苯二甲酸表现出两套电导值,反应了分子内主链对分子结电...

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Published in物理化学学报 Vol. 31; no. 1; pp. 105 - 110
Main Author 韩迪 洪泽文 李东方 郑菊芳 王亚浩 周小顺
Format Journal Article
LanguageChinese
Published 浙江师范大学物理化学研究所，浙江省固体表面反应化学重点实验室，浙江 金华 321004 2015
Subjects
单分子结电导
扫描隧道显微镜裂结法
电子输运
铜
银
扫描隧道显微镜裂结法
Cu
银
Ag
电子输运
单分子结电导
铜
Electron transport
Single-molecule junction conductance
Scanning tunneling microscopy break junction
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ISSN1000-6818
DOI10.3866/PKU.WHXB201410223

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Summary:利用基于电化学跳跃接触的扫描隧道显微镜裂结法（ECSTM-BJ）,通过现场形成金属电极,对以Cu和Ag为电极的对苯二甲酸单分子结电导进行了测量.研究结果表明：利用该方法对所有数据直接线性统计即可得到很好结果;两种电极下都存在两套高和低电导值,其中以Cu为电极的单分子结电导高低值分别为11.5和4.0 n S,而以Ag为电极的单分子结电导分别为10.3和3.8 n S,高值都约为低值的3倍,且以Cu为电极的单分子结电导要略大于以Ag为电极的电导,可归结于电极和分子的耦合不同造成的.与同样条件下测量得到的烷基链羧酸单分子结电导只存在一套值相比,对苯二甲酸表现出两套电导值,反应了分子内主链对分子结电导的影响.
Bibliography:11-1892/06
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 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 GCu〉GAg, which indicated the differe
ISSN:1000-6818
DOI:10.3866/PKU.WHXB201410223