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http://dx.doi.org/10.5012/bkcs.2010.31.04.999

Effect of Gold Substrates on the Raman Spectra of Graphene  

Kim, Na-Young (Department of Chemistry, Sungkyunkwan University)
Oh, Min-Kyung (Department of Chemistry, Sungkyunkwan University)
Park, Sung-Ho (Department of Chemistry, Sungkyunkwan University)
Kim, Seong-Kyu (Department of Chemistry, Sungkyunkwan University)
Hong, Byung-Hee (Department of Chemistry, Sungkyunkwan University)
Publication Information
Bulletin of the Korean Chemical Society / v.31, no.4, 2010 , pp. 999-1003 More about this Journal
Abstract
Raman spectra of a single layer graphene sheet placed in different gold substrates were obtained and are discussed in the context of surface enhanced Raman scattering (SERS). The gold substrates were composed of a combination of a thermally deposited gold film and a close-packed gold nanosphere layer. The SERS effects were negligible when the excitation wavelength was 514 nm, while the Raman signals were enhanced 3-to 50-fold when the excitation wavelength was 633 nm. The large SERS enhancement accompanied a spectral distortion with appearance of several unidentifiable peaks, as well as enhancement of a broadened D peak. These phenomena are interpreted as the local field enhancement in the nanostructure of the gold substrates. The difference in the enhancement factors among the various gold substrates is explained with a model in which the spatial distribution and polarization of the local field and the orientation of the inserted graphene sheet are considered important.
Keywords
Graphene; Raman; Gold; Nanoparticles; Surface Enhanced Raman Scattering;
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