Abstract

We investigated the optical absorption spectra of Ag-, Cu-, and Au-mesoporous SiO2 systems, respectively, after the samples were heated in dry air and in wet air. As expected, dry air at high temperature leads to the surface plasmon resonance (SPR) disappearance of Ag-SiO2 and Cu-SiO2 and a slight SPR increase of Au-SiO2. However, a small amount of water vapor in air induces a strong SPR appearance for both Ag- and Au-containing samples, indicating that water vapor plays an abnormal reduction effect on both Ag and Au species in mesoporous SiO2, despite the fact that it usually plays an oxidation role on Pt-group metals, but it cannot induce the SPR appearance for the Cu-containing sample under the same condition.

© 2012 Optical Society of America

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