Resonant Charge Transport in Conjugated Molecular Wires beyond 10 nm Range

Using a scanning tunneling microscope, we measured high-bias conductance of single polyporphyrin molecular wires with lengths from 1.3 to 13 nm. We observed several remarkable transport characteristics, including multiple sharp conductance peaks, conductances as high as 20 nS in wires with lengths o...

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Published inJournal of the American Chemical Society Vol. 138; no. 35; pp. 11140 - 11143
Main Authors Kuang, Guowen, Chen, Shi-Zhang, Wang, Weihua, Lin, Tao, Chen, Keqiu, Shang, Xuesong, Liu, Pei Nian, Lin, Nian
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 07.09.2016
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Summary:Using a scanning tunneling microscope, we measured high-bias conductance of single polyporphyrin molecular wires with lengths from 1.3 to 13 nm. We observed several remarkable transport characteristics, including multiple sharp conductance peaks, conductances as high as 20 nS in wires with lengths of >10 nm, and nearly length-independent conductance (attenuation <0.001 Å–1). We carried out first-principles simulations on myriad metal–molecule–metal junctions. The simulations revealed that the measured conductance is coherent resonant transport via a delocalized molecular orbital.
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ISSN:0002-7863
1520-5126
DOI:10.1021/jacs.6b07416