Abstract
The optical evolution for monolithic mesoporous silica soaked inAg+ ion solution (0.01–0.06 M) and annealed in air or water vapour is investigated. Heat treatment in airresults in the absence of the surface plasmon resonance (SPR) peak of Ag nanoparticles. However,water vapour annealing induces a strong Ag SPR peak, exhibiting a strong reduction effect onAg+ ions and an enhancement effect on the SPR absorption. The enhancement and weakeningof the SPR can be controlled through annealing in water vapour and air alternately.This finding indicates the possibility that Ag nanoparticles dispersed in silicamay be useful in optical sensors for humid environment use at high temperature.
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