Controllable synthesis of hierarchical assembled porous ZnO microspheres for acetone gas sensor

Three dimensional hierarchical ZnO micro-Inanostructures with controlled morphology and dimensionality are successfully synthesized through a facile aqueous solution route. The results of morphology, structure and microstructure of the 3D ZnO microspheres show that the microspheres are composed of interconnected nanosheets/nanorods with the uniform size of 1-2 mu m. Gas sensors based on hierarchically ZnO microspheres show high sensitivity for acetone as well as quick response and recovery time due to the high surface-to-volume ratio. The results show that the prepared 3D hierarchically ZnO microsphere demonstrated excellent sensor properties in terms of higher sensitivity and very fast response because of the unique structures. (C) 2015 Elsevier B.V. All rights reserved.