Signature vibrational bands for defects in CVD single-layer graphene by surface-enhanced Raman spectroscopy

Dallas L. Matz, Hossein Sojoudi, Samuel Graham, Jeanne E. Pemberton

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

We report the observation of signature vibrational bands in the frequency region between 900 and 1600 cm-1 for defects in single-layer graphene (SLG) using surface Raman spectroscopy in ultrahigh vacuum. Vapor deposition of Ag leads to the formation of surface nanoparticles that migrate to defects in the SLG, leading to surface-enhanced Raman scattering (SERS) of the graphene G and 2D bands as well as new vibrational modes ascribed to native defects. Many of the new spectral bands of these native defects are similar, although not identical, to those predicted previously for -C2 defects. These new bands are observed in addition to bands more commonly observed for defective graphene that are attributed to the D, G∗, D+G, and 2D' modes. The defects observed in these SLG films are not believed to result from the Ag deposition process but are postulated to be formed during the graphene CVD growth process. These defects are then made visible by postdeposition of Ag due to SERS.

Original languageEnglish (US)
Pages (from-to)964-969
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume6
Issue number6
DOIs
StatePublished - Mar 19 2015

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Keywords

  • defects
  • single-layer graphene
  • surface-enhanced Raman scattering

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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