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Both response and selectivity are key issues for a gas sensing material. Here, we presented a porous Ag/Ag2O–SnO2 composite with excellent sensing performance towards hydrogen. The optimal weight ratio of Ag to SnO2 was 3wt% in the Ag/Ag2O–SnO2 composite, which gave the highest response of 40–200ppm hydrogen at 170°C. And what is more, it was nearly insensitive to carbon monoxide and methane at this...
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