Side-Group Effect on Electron Transport of Single Molecular Junctions
AbstractIn this article, we have investigated the influence of the nitro side-group on the single molecular conductance of pyridine-based molecules by scanning tunneling microscopy break junction. Single molecular conductance of 4,4′-bipyridine (BPY), 3-nitro-4-(pyridin-4-yl)pyridine (BPY-N), and 3-nitro-4-(3-nitropyridin-4-yl)pyridine (BPY-2N) were measured by contact with Au electrodes. For the BPY molecular junction, two sets of conductance were found with values around 10−3.1 G0 (high G) and 10−3.7 G0 (low G). The addition of nitro side-group(s) onto the pyridine ring resulted in lower conductance of 10−3.8 G0 for BPY-N and 10−3.9 G0 for BPY-2N, respectively, which can be attributed to the twist angle of two pyridine rings. Moreover, the steric hindrance of nitro group(s) also affects the contacting configuration of electrode-molecule-electrode. As a consequence, only one set of conductance value was observed for BPY-N and BPY-2N. Our work clearly shows the important role of side-groups on the electron transport of single-molecule junctions. View Full-Text
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Huang, M.-L.; Zhang, F.; Wang, C.; Zheng, J.-F.; Mao, H.-L.; Xie, H.-J.; Shao, Y.; Zhou, X.-S.; Liu, J.-X.; Zhuang, J.-L. Side-Group Effect on Electron Transport of Single Molecular Junctions. Micromachines 2018, 9, 234.
Huang M-L, Zhang F, Wang C, Zheng J-F, Mao H-L, Xie H-J, Shao Y, Zhou X-S, Liu J-X, Zhuang J-L. Side-Group Effect on Electron Transport of Single Molecular Junctions. Micromachines. 2018; 9(5):234.Chicago/Turabian Style
Huang, Miao-Ling; Zhang, Fan; Wang, Chen; Zheng, Ju-Fang; Mao, Hui-Ling; Xie, Hu-Jun; Shao, Yong; Zhou, Xiao-Shun; Liu, Jin-Xuan; Zhuang, Jin-Liang. 2018. "Side-Group Effect on Electron Transport of Single Molecular Junctions." Micromachines 9, no. 5: 234.
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