Abstract
Reversible transformation of silver oxide and metallic nanoparticles inside a relatively porous silica film has been established. Annealing of Ag-doped films in oxidizing (air) atmosphere at 450 °C yielded colorless films containing AgO x . These films were turned yellow when heated in H 2–N 2 (reducing atmosphere) due to the formation of Ag nanoparticles. This yellow coloration (due to nano Ag 0) and bleaching (conversion of Ag 0 → Ag +) are reversible. Optical and photoluminescence spectra are well consistent with this coloration and bleaching. The soaking test of the air-annealed film in Na 2S 2O 3 solution supports the presence of Ag +. Grazing incidence X-ray diffraction and transmission electron microscopy studies reveal the formation of Ag-oxides and Ag nanoparticles in the oxidized and reduced films, respectively.
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