Journal
JOURNAL OF NANOPARTICLE RESEARCH
Volume 13, Issue 10, Pages 5571-5581Publisher
SPRINGER
DOI: 10.1007/s11051-011-0550-5
Keywords
Graphene oxide; Silver nanoparticles; N,N-dimethylformamide; Surface-enhanced Raman scattering
Categories
Funding
- National Science Foundation of China [20804014, 50825301, 51073050]
- Chinese Ministry of Education [210131]
- Hubei Provincial Department of Science Technology [2009CDA021, 2010CDB04606]
- Wuhan Science & Technology Bureau of China [201050231088]
- CAMT at the University of Sydney
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Silver nanoparticles (Ag NPs) have been homogeneously deposited onto graphene oxide (GO) nanosheets by an optimal method, in which N,N-dimethylformamide (DMF) as a co-dispersant of GO and reductant of sliver ions is added to an aqueous suspension of GO and AgNO3. GO nanosheets are uniformly covered by Ag NPs with a narrow size distribution and inter-particle gap. Raman signals of GO are greatly enhanced after deposition owing to the charge transfer interaction of GO with Ag NPs. The GO/Ag composite can be further utilized as an effective surface-enhanced Raman scattering (SERS) active substrate. Several new Raman bands and frequency shifts are clearly observed in using 4-aminothiophenol (4-ATP) as a Raman probe on GO/Ag compared to the normal Raman spectrum of solid 4-ATP. The Raman enhancement arises from a major electromagnetic effect and a minor chemical effect.
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