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Abstract
Novel spindle-like In2O3 porous polyhedra are successfully fabricated by a facile solution route at room temperature combined with a subsequent thermal treatment. Such unique architectures are developed for formaldehyde (HCHO) gas detection. Morphology and structure characterizations confirm that the as-prepared nanoparticles-assembled In2O3 polyhedra are composed of two hexagonal pyramids in the form of bottom overlap and present hierarchical porous structure with novel spindle-like morphology. The gas sensors based on spindle-like In2O3 polyhedra exhibit high sensitivity to 20ppm HCHO with very fast response time (1s), recovery time (2s), good selectivity and well stability. The excellent gas sensing properties are predominantly attributed to the unique spindle-like shape and highly porous structure, thus facilitating gas adsorption/desorption and enhancing surface reaction.
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