【作者】 陈芳； 毛金川； 洪泽文； 郑菊芳； 牛振江； 周小顺；

【Author】 Fang chen;Jin-Chuan Mao;Ze-Wen Hong;Ju-Fang Zheng;Zhen-Jiang Niu;Xiao-Shun Zhou;Key Laboratory of the Ministry of Education for Advanced Catalysis Materials,Institute of Physical Chemistry,Zhejiang Normal University;

【机构】 先进催化材料教育部重点实验室浙江师范大学物理化学研究所；

【摘要】 影响分子结电导因素有很多,如温度、分子结的长度,锚定基团,金属电极等^[1]。分子结的电导可通过改变金属的费米能级和分子前线轨道的能级差来实现,如通过电化学方法改变金属的电极电位来控制。本文中,我们以Cu为电极,采用跳跃接触的电化学扫描隧道显微镜裂结法（ECSTM-BJ）^[2]来测量对苯二甲酸的电导值。图1为当电极电位从45 mV变化到5mV（Cu丝为参比）时,对苯二甲酸的电导变化。我们发现,随着电极电位的降低,对苯二甲酸的电导值变小,说明在该过程中分子结是HOMO主导的电子传输过程。更多还原

【Abstract】 There are many factors can affect the single molecule conductance, such as temperature, molecular length, molecular structure, anchoring groups and so on. However, the single molecular conductance can also be changed by varying the energy gap between electrode Fermi level and the front energy lever of molecule. In this work, we controlled the conductance of single terephalic acid contacting to Cu electrodes by using the electrochemical jump-to-contact scanning tunneling microscopy break junction approach(ECSTM-BJ). Fig.1 shows the conductance of terephalic acid decreases with the decreasing the electrode potential, which indicates the electron transport is dominated by the HOMO through current junction.更多还原