Theoretical Studies on Electronic Transport Properties of 2,5-Dimercapto-Pyridazin Molecular Junctions: Influence of $CO$ and $H_2O$ Molecules
Year: 2015
Author: Ying-Feng Zhang, Xiao-Hua Yi, Zheng Zhang, Jun-Xia Sun, Zong-Liang Li
Journal of Atomic and Molecular Sciences, Vol. 6 (2015), Iss. 4 : pp. 263–271
Abstract
Based on first-principles calculations, the electrode force acted on 2,5-dimercapto-pyridazin molecular device is studied. The pressing effects of $CO$ and $H_2O$ molecules on the 2,5-dimercapto-pyridazin molecular junctions are also studied at B3LYP level to simulate the effects of little ambient molecules on the functional molecular junctions. The electronic transport properties of 2,5-dimercapto-pyridazin molecular junction with the pressing of $CO$ and $H_2O$ molecules are studied by employing elastic scattering Green's function method. The numerical results show that the 2,5-dimercapto-pyridazin can be squeezed out of the electrode gap when the electrode distance is compressed to 1.02 nm. It needs about 1.5 nN stretching force to break down the 2,5-dimercapto-pyridazin molecular junction, which agrees with the experiment probes very well. The 2,5-dimercapto-pyridazin molecule is bent by the pressing of $CO$ or $H_2O$ molecule, and is pushed to the edge of Au (111) triangles with the terminal S atoms first to the bridge and then to the top positions of Au (111) triangles, until at last one terminal S atom is pushed out of Au (111) triangle. The pressing of $CO$ and $H_2O$ molecules to the molecular junctions will enhance the couplings between molecule and electrodes, which further enhances nonresonant transmission of the molecular junctions.
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Journal Article Details
Publisher Name: Global Science Press
Language: English
DOI: https://doi.org/10.4208/jams.092015.101015a
Journal of Atomic and Molecular Sciences, Vol. 6 (2015), Iss. 4 : pp. 263–271
Published online: 2015-01
AMS Subject Headings: Global Science Press
Copyright: COPYRIGHT: © Global Science Press
Pages: 9
Keywords: molecular device 2