OPE molecular junction as a hydrogen gas sensor |
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Institution: | School of Physics and Optoelectronics Engineering, Ludong University, Yantai 264025, People''s Republic of China |
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Abstract: | Oligo(phenylene ethynylene) (OPE) molecular junction has been suggested as a H2 molecule sensor based on calculations using the first principles of density–functional theory and non-equilibrium Green's function. The electronic transport properties of the OPE molecule between two Au electrodes with or without adsorbed H2 molecules are investigated. Results show that the adsorbed H2 molecule significantly changes the characteristics of the current–voltage curve of the OPE molecular junction. The pure OPE molecular junction exhibits a significant negative differential resistance, but this kind of phenomenon will disappear or weaken after hydrogen molecules are adsorbed. The conductance of the junction also obviously decreases in the bias range of −0.4, 0.4] V after adsorbing H2 molecules. These effects can be used to design a H2 molecule sensor. |
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Keywords: | Gas sensor Molecular junction Negative differential resistance Density–functional theory Non-equilibrium Green's function |
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