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Presently, composite ceramics of SnO2 and noble metals being prepared and investigated for sensing oxidizing NO2 at room-temperature. While dramatic increases in resistance had been observed both for 1 wt% Pt-SnO2 and 5 wt% Au-SnO2 composite nanoceramics after becoming exposed to NO2 at room temperature, the biggest escalation in resistance ended up being seen for 1 wt% Pt-5 wt% -Au-SnO2 composite nanoceramics among the three composites. The reaction to 0.5 ppm NO2--20%
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