In this article, a novel flower-like WO3-In2O3 hollow heterostructure was successfully constructed by using an in situ etching method. The morphology characteristics revealed that the In2O3 nanoparticles with average sizes of 50 nm were evenly grown at the mesoporous WO3 hollow microsphere composed with self-assembly WO3 nanoplates (WO3 NPs). In order to evaluate advancements of well-designed heterojunction architecture, the gas sensing properties of varying sensors fabricated by pristine WO3, flower-like WO3 hollow sphere, and flower-like WO3-In2O3 hollow heterojunction to acetone gas were sy...
