期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 512, 期 -, 页码 93-100出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2016.10.028
关键词
Electrostatic self-assembly method; Au NPs@GO films; Surface-enhanced Raman scattering; R6G molecules
资金
- National Science Foundation of China [51572114]
- Fundamental Research Funds for the Central Universities [30920140122003]
- Senior Talent Foundation of Jiangsu University [15JDG078]
- Students research project in Jiangsu University [14A335]
The paper reports a simple electrostatic self-assembly method to fabricate the gold nanoparticles/graphene oxide (Au NPs@GO) films which present superior SERS activity. The Au NPs@GO films with different layers construction and surface compositions (with Au NPs or GO as the outer layer) are obtained simply by changing the self-assembly cycles. Results indicate that the film with two assembly cycles (F-2 film) exhibits the best SERS activity towards R6G molecules compared with that of one assembly cycle (F-1 film) and three assembly cycles (F-3 film) due to the high loadings of the absorbed Au NPs exposed on the surface of the film. Meanwhile, the Raman enhancement effect of the F-2 film with the outer layer of Au NPs is better than that of the outer layer covering with GO sheets (F-2-GO) possibly owing to the optimal synergetic effect of Au NPs and GO. Furthermore, our fabricated Au NPs@GO films present favorable reproducibility and high stability, which are significant for the practical application of these SERS substrates. (C) 2016 Elsevier B.V. All rights reserved.
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