Abstract
Au/<TEX>$SnO_2$</TEX> core-shell structure nanoparticles (NPs) were synthesized by microwave hydrothermal method, and the effect of working temperature on sensitivity of Au/<TEX>$SnO_2$</TEX> core-shell NPs for CO gas was investigated. The <TEX>$SnO_2$</TEX> shell layer was consisted of <TEX>$SnO_2$</TEX> primary particles with 4.5 nm diameter. The response of Au/<TEX>$SnO_2$</TEX> core-shell NPs for CO gas was maximized at the working temperature of <TEX>$350^{\circ}C$</TEX> while the sensitivity increased with decreasing the working temperature due to the low grain size effect of <TEX>$SnO_2$</TEX> NPs on the response of CO gas.
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