Reactivity of monolayer chemical vapor deposited graphene imperfections studied using scanning electrochemical microscopy

Cen Tan, Joaquín Rodríguez-López, Joshua J. Parks, Nicole L. Ritzert, Daniel C. Ralph, Héctor D. Abruña

Research output: Contribution to journalArticlepeer-review

Abstract

Imperfections that disrupt the sp 2 conjugation of graphene can alter its electrical, chemical, and mechanical properties. Here we report on the examination of monolayer chemical vapor deposited graphene imperfections using scanning electrochemical microscopy in the feedback mode. It was found that the sites with a large concentration of defects are approximately 1 order of magnitude more reactive, compared to more pristine graphene surfaces, toward electrochemical reactions. Furthermore, we successfully passivated the activity of graphene defects by carefully controlling the electropolymerization conditions of o-phenylenediamine. With further electropolymerization, a thin film of the polymer was formed, and it was found to be insulating in nature toward heterogeneous electron transfer processes. The use of spatially resolved scanning electrochemical microscopy for detecting the presence and the "healing" of defects on graphene provides a strategy for in situ characterization and control of this attractive surface, enabling optimization of its properties for application in electronics, sensing, and electrocatalysis.

Original languageEnglish (US)
Pages (from-to)3070-3079
Number of pages10
JournalACS Nano
Volume6
Issue number4
DOIs
StatePublished - Apr 24 2012
Externally publishedYes

Keywords

  • defects
  • electrochemistry
  • graphene
  • o-phenylenediamine
  • scanning electrochemical microscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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