Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 438, Issue -, Pages 29-38Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2014.09.068
Keywords
Graphene; Silver nanoparticles; Nanocomposites; Liquid-liquid interfaces; SERS substrates
Categories
Funding
- CNPq
- CAPES
- INCT-Nanocarbono (CNPq)
- LME-UFPR
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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.
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