Abstract
Evolution of the various optical spectra of Ag nanoparticles dispersed in mesoporousSiO2 after heatingalternately in H2 and air atmospheres has been investigated. It has been observed that, in accordance with alternate heattreatment in H2 and air, surface plasmon resonance (SPR) absorption of the Ag/mesoporousSiO2 nanostructure alternately appeared and disappeared and its Raman scattering spectrareversibly increased and decreased. In contrast, its photoluminescence (PL) spectra alternatelydisappeared and appeared, whereas the infrared (IR) spectra did not change. Such noveloptical sensitivities of silver nanoparticles are discussed on the basis of the changes in chemicalstates of silver induced by the interaction of silver nanoparticles with the atmospheres andthe hosting medium. It is suggested that the chemical state of silver in mesoporousSiO2 changes reversiblybetween Ag and the Ag+ ion by the redox process.
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