期刊
ELECTROCHIMICA ACTA
卷 200, 期 -, 页码 268-275出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.03.129
关键词
Molecular junction; MCBJ; Electrochemical deposition; Density functional theory; Non-equilibrium Green's function
资金
- National Basic Research Program of China [2011YQ030124, 2015CB932301, 2015CB932300]
- National Natural Science Foundation of China [21503179, 91427304, 21533006, 21522508, 21321062, 21303114, 21403181, 21173094, 21573086]
- Natural Science Foundation of Fujian Province [2016J05162]
- CNRS UMR 8640 PASTEUR
- LIA CNRS NanoBioCatEchem
We demonstrate an electrochemically assisted mechanically controllable break junction (EC-MCBJ) approach for current-voltage characteristic (I-V curve) measurements of metal/molecule/metal junctions. A series of oligo(phenylene ethynylene) s compounds (OPEs), including those involving electron withdrawing substituent group and different backbone lengths, had been successfully designed, synthesized, and placed onto the fabricated nanogap to form molecular junctions. The observed evolution in the measured conductances of OPEs indicates that there is a dependence of conductance on molecular length and substituent group. Compared with those extracted from conductance histogram construction, the conductances of OPEs measured from I-V curves are considerably lower. Based on the transmission spectra of OPEs that calculated by density functional theory (DFT) combined with nonequilibrium Green's function (NEGF) method, this difference was attributed to our distinct experimental operation, which may give rise to a stacking configuration of two OPE molecules. (C) 2016 Elsevier Ltd. All rights reserved.
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