Issue 7, 2022

Doping of graphene via adlayer formation of electrochemically reduced dibenzyl viologen

Abstract

In this contribution we demonstrate doping of graphene by uncharged dibenzyl viologen (DBV0). Deposited electrochemically on chemical vapor deposited (CVD) graphene on SiO2, DBV0 forms a water-insoluble self-assembled molecular network, in contrast to water-soluble monocationic DBV˙+. The phase formation at the molecular scale is revealed by scanning tunneling microscopy (STM) and atomic force microscopy (AFM). The doping efficiency is characterized by a combination of Raman spectroscopy and Kelvin probe force microscopy (KPFM). The Raman mapping of the G-band of the DBV0 adlayer on top of CVD graphene on SiO2 shows an apparent red shift compared to the unmodified analogue indicating an n-doping effect. This observation is in line with the KPFM results of which the measured contact potential difference (CPD) displays a positive shift compared to that of the pristine graphene.

Graphical abstract: Doping of graphene via adlayer formation of electrochemically reduced dibenzyl viologen

Supplementary files

Article information

Article type
Paper
Submitted
06 Jūl. 2021
Accepted
19 Sept. 2021
First published
29 Sept. 2021

J. Mater. Chem. C, 2022,10, 2696-2702

Doping of graphene via adlayer formation of electrochemically reduced dibenzyl viologen

T. M. T. Huynh, T. H. Phan, R. Phillipson, A. Volodine and S. De Feyter, J. Mater. Chem. C, 2022, 10, 2696 DOI: 10.1039/D1TC03142B

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