The influence of Ag particle size on ethanol sensing of films composed of size-selected nanoparticles with independently controlled size and concentration of Ag is reported in the present study. The study shows that Ag nanoparticles are acting as catalyst for chemical sensitization through a spillover effect. The catalyst particles are observed to be more active on decreasing their size, resulting into an improved sensor response. A response time of for ethanol has been achieved. Detection of ethanol in air has been demonstrated using this well-defined technique.
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