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Hu, Jinlian,Lee, Woong,Cai, Weiping,Tong, Liuniu,Zeng, Haibo IOP Pub 2007 Nanotechnology Vol.18 No.18
<P>Evolution of the various optical spectra of Ag nanoparticles dispersed in mesoporous SiO<SUB>2</SUB> after heating alternately in H<SUB>2</SUB> and air atmospheres has been investigated. It has been observed that, in accordance with alternate heat treatment in H<SUB>2</SUB> and air, surface plasmon resonance (SPR) absorption of the Ag/mesoporous SiO<SUB>2</SUB> nanostructure alternately appeared and disappeared and its Raman scattering spectra reversibly increased and decreased. In contrast, its photoluminescence (PL) spectra alternately disappeared and appeared, whereas the infrared (IR) spectra did not change. Such novel optical sensitivities of silver nanoparticles are discussed on the basis of the changes in chemical states of silver induced by the interaction of silver nanoparticles with the atmospheres and the hosting medium. It is suggested that the chemical state of silver in mesoporous SiO<SUB>2</SUB> changes reversibly between Ag and the Ag<SUP>+</SUP> ion by the redox process. </P>