作者
V Fatemi, M Kamenetska, JB Neaton, L Venkataraman
发表日期
2011/5/11
期刊
Nano letters
卷号
11
期号
5
页码范围
1988-1992
出版商
American Chemical Society
简介
The conductance of individual 1,4-benzenediamine (BDA)–Au molecular junctions is measured in different solvent environments using a scanning tunneling microscope based point-contact technique. Solvents are found to increase the conductance of these molecular junctions by as much as 50%. Using first principles calculations, we explain this increase by showing that a shift in the Au contact work function is induced by solvents binding to undercoordinated Au sites around the junction. Increasing the Au contact work function reduces the separation between the Au Fermi energy and the highest occupied molecular orbital of BDA in the junction, increasing the measured conductance. We demonstrate that the solvent-induced shift in conductance depends on the affinity of the solvent to Au binding sites and also on the induced dipole (relative to BDA) upon adsorption. Via this mechanism, molecular junction level …
学术搜索中的文章
V Fatemi, M Kamenetska, JB Neaton, L Venkataraman - Nano letters, 2011