Thin and transparent films of graphene/silver nanoparticles obtained at liquid-liquid interfaces: Preparation, characterization and application as SERS substrates

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:438

Article

Mehl, Hiany¹  Oliveira, Marcela Mohallem²  Gorgatti Zarbin, Aldo Jose² 

[1] Univ Fed Parana UFPR, Dept Quim, Curitiba, Parana, Brazil

[2] Univ Tecnol Fed Parana UTFPR, Dept Acad Quim & Biol, Curitiba, Parana, Brazil

关键词: Graphene;    Silver nanoparticles;    Nanocomposites;    Liquid-liquid interfaces;    SERS substrates;   

DOI  :  10.1016/j.jcis.2014.09.068

来源: Elsevier

【 摘 要 】

We report here the synthesis and characterization of transparent and homogeneous thin films of reduced graphene oxide/silver nanoparticles (rGO/AgNPs) nanocomposites, starting from graphene oxide (GO) or reduced graphene oxide (rGO), directly obtained at a water/toluene liquid-liquid interface. Different films (obtained by varying the Ag/rGO or Ag/GO ratio) were prepared, deposited over glass or plastic substrates, and characterized by X-ray diffraction, UV-Vis and Raman spectroscopy, thermal analysis, transmission and scanning electron microscopy. Samples were evaluated as substrates for surface-enhanced Raman spectroscopy (SERS), using dilute solutions (1 x 10(-7) mol L-1) of a common probe molecule, 4-aminothiophenol (4-ATP). These materials exhibit significant high-quality SERS activity, and enhanced modes could be observed for 4-ATP, which suggested that charge transfer occurred between the Ag nanoparticles and 4-ATP molecules. (C) 2014 Elsevier Inc. All rights reserved.

【 授权许可】

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