کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5373122 | 1504200 | 2016 | 5 صفحه PDF | دانلود رایگان |
We have studied the effects of stretching and compression on the electronic properties of 7-alkanedithiol covalently linked to two Au electrodes. Results show a progressive increase in conductivity upon molecule compression and decrease with molecule stretching. The notable conductance increase at high compression is attributed to a significant modification of HOMO and LUMO orbitals of the junction, which enhances electron delocalization and promotes tunneling across the junction. More important, the current switching ratios between the various stages of compressed/extended geometries almost maintain the constant values on the bias region from 0Â V to 2Â V. In other word, the mechanically-induced conductance enhancement and weakening are stable within a large bias voltage range.
Journal: Chemical Physics - Volume 467, 1 March 2016, Pages 21-25