Surface-enhanced raman scattering study on graphene-coated metallic nanostructure substrates

Qingzhen Hao, Bei Wang, Jeremy A. Bossard, Brian Kiraly, Yong Zeng, I. Kao Chiang, Lasse Jensen, Douglas H. Werner, Tony Jun Huang

Research output: Contribution to journalArticle

86 Scopus citations

Abstract

Graphene, which has a linear electronic band structure, is widely considered as a semimetal. In the present study, we combine graphene with conventional metallic surface-enhanced Raman scattering (SERS) substrates to achieve a higher sensitivity of SERS detection. We synthesize high-quality, single-layer graphene sheets by chemical vapor deposition (CVD) and transfer them from copper foils to gold nanostructures, that is, nanoparticle or nanohole arrays. SERS measurements are carried out on methylene blue (MB) molecules. The combined graphene nanostructure substrates show about a 3-fold or 9-fold enhancement in the Raman signal of MB, compared with the bare nanohole or nanoparticle substrates, respectively. The difference in the enhancement factors is explained by the different morphologies of graphene on the two substrates with the aid of numerical simulations. Our study indicates that applying graphene to SERS substrates can be an effective way to improve the sensitivity of conventional metallic SERS substrates.

Original languageEnglish (US)
Pages (from-to)7249-7254
Number of pages6
JournalJournal of Physical Chemistry C
Volume116
Issue number13
DOIs
StatePublished - Apr 5 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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