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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Distance Dependence of Electron Tunneling through Self-Assembled Monolayers Measured by Conducting Probe Atomic Force Microscopy: Unsaturated versus Saturated Molecular Junctions
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Distance Dependence of Electron Tunneling through Self-Assembled Monolayers Measured by Conducting Probe Atomic Force Microscopy: Unsaturated versus Saturated Molecular Junctions

机译：电子隧穿通过自组装单分子层通过导电探针原子力显微镜测量的距离依赖性：不饱和与饱和分子连接

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Electron tunneling through self-assembled monolayers (SAMs) composed of either unsaturated or saturated molecules was investigated using conducting probe atomic force microscopy (CP-AFM). SAMs of unsaturated oligophenylene thiolates or saturated alkanethiolates were assembled on Au substrates and contacted with a Au-coated AFM tip at constant applied load. The current-voltage (I-V) characteristics of both types of SAMs were linear over ±0.3 V. Resistance (R) increased exponentially with molecular length (s) in both cases according to the expected relationship, R = R-0 exp(βs), but the rate of increase, as quantified by the structure-dependent factor β, was much less for the unsaturated SAMs than for the saturated alkanethiolate SAMs. Average β values were 0.42 ± 0.07 A~(-1) for the oligophenylene thiolate SAMs and 0.94 ± 0.06 A~(-1) for the alkanethiolate SAMs. Extrapolation of semilog plots of resistance versus molecular length to zero length yielded an estimate of the metal-molecule contact resistance, which was 10~4 Ω for a 50 nm radius Au-coated tip in contact with either the oligophenylene thiolates or alkanethiolates. This study establishes that CP-AFM can be used to probe transport in molecular junctions as a function of molecular dimensions and structure
机译：使用导电探针原子力显微镜（CP-AFM）研究了通过不饱和或饱和分子组成的自组装单层（SAM）的电子隧穿。将不饱和低聚亚苯基硫醇盐或饱和链烷硫醇盐的SAMs组装在Au基底上，并在恒定施加载荷下使其与Au涂层的AFM尖端接触。两种类型SAM的电流-电压（IV）特性在±0.3 V以上呈线性关系。两种情况下，电阻（R）随分子长度（s）呈指数增长，这取决于预期关系，R = R-0 exp（βs） ，但是，由结构依赖性因子β量化的增加速率，对于不饱和SAM来说要比饱和链烷硫醇SAM少得多。低聚亚苯基硫醇盐SAMs的平均β值为0.42±0.07 A〜（-1），而链烷硫醇盐SAMs的平均β值为0.94±0.06 A〜（-1）。将电阻对分子长度的半对数图外推到零长度可得出金属-分子接触电阻的估计值，该半径为50 nm半径的Au涂层尖端与硫代低苯硫醇盐或链烷硫醇盐接触时为10〜4Ω。这项研究建立了CP-AFM可以用来探测分子连接中作为分子尺寸和结构的函数的运输

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