Fabrication and Characterization of Graphene-Ag Nanoparticles Composites

doi:10.3724/SP.J.1077.2012.00089

Abstract

Abstract:

Graphene-Ag nanoparticles composites were prepared by one step in situ synthesis method, using nontoxic green glucose as reducer. Graphite oxide and ammoniacal silver ions were reduced at the same time without stabilizing agent under mild reaction conditions of aqueous solution. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscope, scanning electronic microscope (SEM), and transmission electronic electron microscope (TEM) were used to characterize the resulting composites. The results of analysis indicate that graphite oxide and ammoniacal silver ions are reduced by glucose simultaneously. Ag nanoparticles (AgNPs) uniformly distribute in the graphene sheets, and most of AgNPs show twin boundary. The quantity of silver nitrate influences the size and range of sizes of the AgNPs. The range of sizes of AgNPs on the graphene sheets centralizes at 25 nm under a suitable concentration of silver ions. The intensities of the Raman signals of graphene in the composites increase 7 fold by the loaded AgNPs.

Key words: graphene, Ag nanoparticles, composites, Raman spectrum

CLC Number:

TB33

YU Mei, LIU Peng-Rui, SUN Yu-Jing, LIU Jian-Hua, AN Jun-Wei, LI Song-Mei. Fabrication and Characterization of Graphene-Ag Nanoparticles Composites[J]. Journal of Inorganic Materials, 2012, 27(1): 89-94.

Figures/Tables 7

Fig. 1 XRD patterns of graphite (a) and GO (b)

Fig. 2 XRD patterns of graphene and graphene-Ag nanoparticles composites

Fig. 3 FT-IR spectra of samples (a) GO, (b) GNs and (c) GNs-Ag-2

Fig. 4 Raman spectra of samples (a) GO, (b) GNs and (c) GNs-Ag-2

Table 1 The ratio of D and G band in Raman spectra

Sample	GO	GNs	GNs-Ag-2
I_D/G	0.82	0.92	0.96

Fig. 5 SEM images of graphene and graphene-Ag nanoparticles composites (a) GNs; (b) GNs-Ag-1; (c) GNs-Ag-2; (d) GNs-Ag-3

Fig. 6 TEM and HRTEM images of graphene-Ag nanoparticles composites GNs-Ag-2

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