Nano-Ag-SiO2 composite films with Ag nanoparticles embedded in SiO2 were prepared by sol-gel method via hydrolyze reactions. The thermal stabilization of nano-Ag-SiO2 film was investigated by the absorbance spectrum of localized surface plasmon resonance (SPR) of Ag nanoparticles. The nano-Ag-SiO2 film was further characterized by thermogravimety-differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersire spectrometer(EDS). The results show that the SPR peaks of Ag nanoparticles in the films appear and strengthen after annealeding, then weaken and finally disappear when the annealing temperature increases from 200 to 900°C, with the maximum absorbance at the annealing temperature of 500 and 600°C. The film annealed at 500°C has a good thermal stability, wherein SiO2 in the nanocomposites is amorphous. Ag nanoparticles get diffusing and volatilizing with increasing the temperature to 700°C and the annealing time increases, at the same time, SiO2 particles transform into crystalloid from noncrystal.
|ジャーナル||Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment|
|出版ステータス||Published - 2011 6月|
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