# Carbon-contacted single molecule electrical junctions

4 GMT - Groupe Modélisation et Théorie
IRAMIS - Institut Rayonnement Matière de Saclay, SPEC - UMR3680 - Service de physique de l'état condensé
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 –CH_2 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
Document type :
Journal articles
Domain :

https://hal-cea.archives-ouvertes.fr/cea-01935453
Contributor : Dominique Girard <>
Submitted on : Tuesday, November 27, 2018 - 4:16:36 PM
Last modification on : Friday, March 5, 2021 - 3:07:12 PM

### Citation

Chunhui He, Qian Zhang, Shuhui Tao, Cezhou Zhao, Chun Zhao, et al.. Carbon-contacted single molecule electrical junctions. Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2018, 20 (38), pp.24553 - 24560. ⟨10.1039/C8CP02877J⟩. ⟨cea-01935453⟩

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