期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 17, 期 8, 页码 2381-2387出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201002027
关键词
gold; graphene; Raman spectroscopy; surface chemistry
资金
- MEST of Korea [R31-2008-000-20012-0]
- KICOS through MEST [2009-00591]
Surface-enhanced Raman scattering (SERS) of graphene on a SiO2(300 nm)/Si substrate was investigated by depositing Au nanoparticles using thermal evaporation. This provided a maximum enhancement of 120 times for single-layer graphene at 633 nm excitation. SERS spectra and scan images of single-layer and few-layer graphene were acquired. Single-layer graphene provides much larger SERS enhancement compared to few-layer graphene, while in single-layer graphene the enhancement of the G band was larger than that of the 2D band. Furthermore, the D bands were identified in the SERS spectra; these bands were not observed in a normal Raman spectrum without Au deposition. Appearance of the D band is ascribed to the considerable SERS enhancement and not to an Au deposition-induced defect. Lastly, SERS enhancement of graphene on a transparent glass substrate was compared with that on the SiO2(300 nm)/Si substrate to exclude enhancement by multiple reflections between the Si substrate and deposited Au nanoparticles. The contribution of multiple reflections to total enhancement on the SiO2(300 nm)/Si substrate was 1.6 times out of average SERS enhancement factor, 71 times.
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