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Issue 38, 2018
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Carbon-contacted single molecule electrical junctions

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Abstract

A fully metal-free molecular junction (MJ) has been built by using an electrochemically etched carbon fibre STM tip as the top electrode and graphene as the bottom electrode. The corresponding conductance values for 1,n-alkanediamine and 1,n-alkanedithiol (n = 2, 4, 6, 8 and 10) have been measured using the STM-I(s) technique. The tunnelling decay constant of the alkanediamine and alkanedithiol junctions with these carbon contacts is much lower than the corresponding metal contacted junctions of 0.24 and 0.38 per –CH2 unit, but the junction conductance with these carbon contacts is also lower. The carbon fibre tip can be considered a good candidate as an electrode. Compared with a gold tip, the carbon fibre tip leads to correspondingly lower molecular junction conductance.

Graphical abstract: Carbon-contacted single molecule electrical junctions

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Publication details

The article was received on 06 May 2018, accepted on 21 Jun 2018 and first published on 21 Jun 2018


Article type: Paper
DOI: 10.1039/C8CP02877J
Phys. Chem. Chem. Phys., 2018,20, 24553-24560

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    Carbon-contacted single molecule electrical junctions

    C. He, Q. Zhang, S. Tao, C. Zhao, C. Zhao, W. Su, Y. J. Dappe, R. J. Nichols and L. Yang, Phys. Chem. Chem. Phys., 2018, 20, 24553
    DOI: 10.1039/C8CP02877J

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