Doping of graphene via adlayer formation of electrochemically reduced dibenzyl viologen

In this contribution we demonstrate doping of graphene by uncharged dibenzyl viologen (DBV 0 ). Deposited electrochemically on chemical vapor deposited (CVD) graphene on SiO 2 , DBV 0 forms a water-insoluble self-assembled molecular network, in contrast to water-soluble monocationic DBV˙ + . The pha...

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Published inJournal of materials chemistry. C, Materials for optical and electronic devices Vol. 10; no. 7; pp. 2696 - 2702
Main Authors Huynh, Thi Mien Trung, Phan, Thanh Hai, Phillipson, Roald, Volodine, Alexander, De Feyter, Steven
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 17.02.2022
Subjects
Atomic force microscopy
Chemical vapor deposition
Contact potentials
Doping
Doppler effect
Graphene
Microscopy
Raman spectroscopy
Red shift
Scanning tunneling microscopy
Self-assembly
Silicon dioxide
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Summary:In this contribution we demonstrate doping of graphene by uncharged dibenzyl viologen (DBV 0 ). Deposited electrochemically on chemical vapor deposited (CVD) graphene on SiO 2 , DBV 0 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 DBV 0 adlayer on top of CVD graphene on SiO 2 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.
ISSN:2050-7526
2050-7534
DOI:10.1039/D1TC03142B