Graphene as a Promising Electrode for Low-Current Attenuation in Nonsymmetric Molecular Junctions - Archive ouverte HAL Access content directly
Journal Articles Nano Letters Year : 2016

Graphene as a Promising Electrode for Low-Current Attenuation in Nonsymmetric Molecular Junctions

(1, 2) , (3) , (2, 1) , (2) , (4) , (5, 6) , (5) , (1) , (2, 1)
1
2
3
4
5
6

Abstract

We have measured the single-molecule conductance of 1,$\it n$-alkanedithiol molecular bridges ($\it n$ = 4, 6, 8, 10, 12) on a graphene substrate using scanning tunneling microscopy (STM)-formed electrical junctions. The conductance values of this homologous series ranged from 2.3 nS ($\it n$= 12) to 53 nS ($\it n$= 4), with a decay constant β$_n$ of 0.40 per methylene (−CH$_2$) group. This result is explained by a combination of density functional theory (DFT) and Keldysh− Green function calculations. The obtained decay, which is much lower than the one obtained for symmetric gold junctions, is related to the weak coupling at the molecule−graphene interface and the electronic structure of graphene. As a consequence, we show that using graphene nonsymmetric junctions and appropriate anchoring groups may lead to a much-lower decay constant and more-conductive molecular junctions at longer lengths.

Dates and versions

cea-01490890 , version 1 (16-03-2017)

Identifiers

Cite

Qian Zhang, Li Liu, Shuhui Tao, Congyi Wang, Cezhou Zhao, et al.. Graphene as a Promising Electrode for Low-Current Attenuation in Nonsymmetric Molecular Junctions. Nano Letters, 2016, 16, pp.6534 - 6540. ⟨10.1021/acs.nanolett.6b03180⟩. ⟨cea-01490890⟩
147 View
0 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More