Abstract
The authors report on gas sensing properties ofSnO2 hollow spheres with diverse microstructures, which are synthesized through controlled precipitationof Sn(OH)4 layers on carbon sphere templates, followed by heat treatment at differenttemperatures. Hollow spheres derived at 973 K consist of monolayerSnO2 grains, which lead to a huge activated surface area. The sensitivity of sensors based onSnO2 monolayer hollow spheres is up to 51 at 100 ppm ethanol, which is much higher than that oftwo other samples. We attribute this enhancement mostly to the enhanced depletion effectarising from the increased exposed surface. Our results suggest a direction forimproving the performance of gas sensors by using monolayer porous hollow spheres.
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