Physics – Condensed Matter – Materials Science
Scientific paper
2010-11-03
Appl. Phys. Lett. 97, 163111 (2010)
Physics
Condensed Matter
Materials Science
11 pages, 4 figures
Scientific paper
In this paper, we report our study on gold (Au) films with different thicknesses deposited on single layer graphene (SLG) as surface enhanced Raman scattering (SERS) substrates for the characterization of rhodamine (R6G) molecules. We find that an Au film with a thickness of ~7 nm deposited on SLG is an ideal substrate for SERS, giving the strongest Raman signals for the molecules and the weakest photoluminescence (PL) background. While Au films effectively enhance both the Raman and PL signals of molecules, SLG effectively quenches the PL signals from the Au film and molecules. The former is due to the electromagnetic mechanism involved while the latter is due to the strong resonance energy transfer from Au to SLG. Hence, the combination of Au films and SLG can be widely used in the characterization of low concentration molecules with relatively weak Raman signals.
Hao Yufeng
Hu Hailong
Ni Zhenhua
Shen Ze Xiang
Thong John TL
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