Journal
MATERIALS
Volume 11, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/ma11071199
Keywords
graphene oxide; graphene; surface-enhanced Raman scattering (SERS); oxygen-containing groups; chemical enhancement; sp(2) carbon domain
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Funding
- National Natural Science Foundation of China [51602192]
- Talent Program of Shanghai University of Engineering Science
- Foundation of Shanghai Young Teachers in Universities or Colleges [ZZgcd14011]
- Shanghai University of Engineering Science Innovation Fund for Graduate Students [17KY0510]
- Science Foundation of Jiangsu Province Special Equipment Safety Supervision Inspection Institute grant [KJ(Y)2017014]
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Graphene and its derivatives have been demonstrated to be good surface-enhanced Raman scattering (SERS) substrates. However, the literature offers some contrasting views on the SERS effect of graphene-based materials. Thus, understanding the mechanism of the SERS enhancement of graphene is essential for exploring its application as a SERS substrate. In this study, graphene oxide (GO) and chemically reduced graphene oxide (CRGO) films with different morphologies and structures were prepared and applied as SERS substrates to detect Raman dye molecules. The observed enhancement factors can be as large as 10 similar to 10(3). The mechanism of SERS enhancement is discussed. It is shown that the SERS effect was independent of the adsorption of dye molecules and the surface morphologies of graphene-based films. Raman shifts are observed and are almost the same on different graphene-based films, indicating the existence of charge transfer between dye molecules and substrates. The Raman enhancement factors and sensitivities of dye molecules on different films are consistently within the I-G/I-D ratios of graphene-based substrates, indicating that the dramatically enhanced Raman spectra on graphene-based films are strongly dependent on the average size of sp(2) carbon domain.
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