Ionic Liquids As a Medium for STM-Based Single Molecule Conductance Determination: An Exploration Employing Alkanedithiols
Ionic Liquids As a Medium for STM-Based Single Molecule Conductance Determination: An Exploration Employing Alkanedithiols
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DOI：
10.1021/jp206241d
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发表时间：
2011-09
影响因子：
3.7
通讯作者：
Nicola J. Kay;R. Nichols;S. Higgins;W. Haiss;Gita Sedghi;W. Schwarzacher;B. Mao
中科院分区：
文献类型：
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作者：
Nicola J. Kay;R. Nichols;S. Higgins;W. Haiss;Gita Sedghi;W. Schwarzacher;B. Mao
采用扫描隧道显微镜（STM）测量了室温离子液体（RTIL） 1-丁基-3-甲基咪唑三氟甲磺酸盐（BMIOTf）中同源系列α，ω-烷二醇的单分子电导。选择烷二醇体系是因为它是一个众所周知的单分子电导评估模型系统，因此允许我们评估离子液体作为此类测定的介质。基于stm的测量是在RTIL中在环境控制条件下进行的，排除了水和氧气。在RTIL中测量的低(A)和中(B)电导组的电导值与之前在不同环境（包括空气和有机溶剂）中测量的电导值相比非常好。对于RTILs中较短的烷二硫醇，已经观察到电导的异常长度依赖性，这与先前在空气中测量的类似观察结果进行了比较。这些测量是在生物模型上进行的…
A scanning tunnelling microscope (STM) has been used to measure the single-molecule conductance of a homologous series of α,ω-alkanedithiols in the room-temperature ionic liquid (RTIL) 1-butyl-3-methylimidazolium trifluoromethanesulfonate (BMIOTf). The alkanedithiol system is chosen because it is a well-known model system for single-molecule conductance evaluation, hence allowing us to evaluate ionic liquids as a medium for such determinations. The STM-based measurements have been made in the RTIL under environmentally controlled conditions with the exclusion of water and oxygen. Conductance values measured in the RTIL for the low (A) and medium (B) conductance groups compare very well with those previously made in different environments including air and organic solvents. Anomalous length dependence of the conductance has been observed for the shorter alkanedithiols in RTILs, and this is compared with similar previous observations for measurements in air. These measurements made on the model alkanedithio...