期刊
NANOSCALE
卷 7, 期 26, 页码 11291-11299出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nr00944h
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资金
- National Natural Science Foundation of China [51472204, 51221001, 51302102]
- Key Scientific and Technological Team from Shanxi Province
- NWPU
- Natural Science Foundation of State Key Laboratory of Solidification Processing [2014KA040098C040098]
- General Research Fund [HKU711813]
- Collaborative Research Fund [C7045-14E]
- RGC-NSFC grant from the Research Grants Council of Hong Kong Special Administrative Region, China [N_HKU709/12]
A simple, low-cost, all-copper sandwich system has been obtained through directly depositing Cu nanoparticles (NPs) onto a graphene sheet, which has already been grown on a Cu foil (Cu-NGF). The new design inherits two key advantages: (1) the materials of the NGF coupling system are composed of only cheaper Cu instead of Au and Ag, (2) direct fabrication of the system without transferring graphene will greatly lower the fabrication cost. More importantly, the Cu-NFG system shows a high sensitivity in surface-enhanced Raman scattering (SERS) with the highest enhancement factor (EF, over 1.89 x 10(7)) reported to date in Cu plasmonic systems. Experimental and theoretical results reveal that the strong EF is mainly because of the strong near-field coupling between Cu NPs and Cu films at the optimal angle of incidence, opening up a new route for Cu materials in SERS applications.
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