【摘要】 利用导电探针原子力显微镜(CP-AFM)构成金属电极/垸基硫醇饱和分子的自组装单分子膜/金属电极的三层结构,研究了该类分子结的电荷输运。利用该结构测量了该分子结的Ⅰ—Ⅴ特性。实验结果表明分子结电导随分子长度的增长指数衰减,并且证实隧穿为饱和分子结中的主要电荷传输机制。同时,实验结果表明该分子结存在明显的整流效应,对该饱和分子结的整流特性进行了理论分析。更多还原

【Abstract】 In this paper,charge transportation in molecular junctions were investigated with a sandwich structure which consists of metal film/saturated alkanethiol self-assembled monolayers(SAM)/Au coa- ted conducting-probe atomic force microscopy(CP-AFM)tip.Ⅰ-Ⅴcharacteristics of molecular junc- tions were measured.The experiment results showed that the molecular conductance decreases exponen- tially with molecule length,and tunneling was confirmed as the dominant transport mechanism in the sat- urated molecules.Rectification effect was also observed in this sandwich structure and theoretical analysis for this kind of rectification effect was given as well.更多还原