Conductance and SERS Measurement of Benzenedithiol Molecules Bridging Between Au Electrodes
Conductance and SERS Measurement of Benzenedithiol Molecules Bridging Between Au Electrodes
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DOI：
10.1021/jp3112638
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发表时间：
2013-01
影响因子：
3.7
通讯作者：
Ryuji Matsuhita;M. Horikawa;Y. Naitoh;Hisao Nakamura;M. Kiguchi
中科院分区：
文献类型：
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作者：
Ryuji Matsuhita;M. Horikawa;Y. Naitoh;Hisao Nakamura;M. Kiguchi
我们测量了室温下桥连在Au纳米间隙电极上的苯二硫醇分子的电导和表面增强拉曼散射（Sers）光谱，研究了分子结的电学和光学性质。基于单能级隧穿模型，考虑到费米分布函数在有限温度下的模糊，研究了分子结的电流-电压特性，给出了跨金属电极的分子数目、导电轨道与费米能级之间的能量差、分子-金属耦合强度等信息.电导测量证实了分子与Au电极之间的相互作用。由于分子与金属电极之间的相互作用，我们可以观察到分子结的Sers光谱特征。表面增强拉曼光谱（Sers）测量表明，分子筛的SH模消失，部分内振动模发生红移，证实了分子筛的分子结构。
We have measured electric conductance and surface enhanced Raman scattering (SERS) spectra for the benzenedithiol molecules bridging between Au nano gap electrodes at room temperature to investigate the electric and optical properties of the molecular junction. The current–voltage characteristic of the molecular junction was investigated based on the single level tunneling model considering that the Fermi distribution function got smeared out for finite temperature, which provided the information on the number of molecules bridging metal electrodes, energy difference between conduction orbital and Fermi level, strength of the molecule-metal coupling. The conductance measurements confirmed the interaction between molecule and Au electrodes. Due to the interaction between molecule and metal electrodes, we could observe the SERS spectra characteristic of the molecular junction. The SERS measurement showed the disappearance of the SH modes and red shift of some internal vibration modes, which confirmed the mo...