ZnO hierarchical 3D-flower like architectures and their gas sensing properties at room temperature

3D-flower like morphology was successfully synthesized by simple hydrothermal method without using any capping agents and surfactants. FE-SEM and TEM showed flower-like morphology composed of numerous sheets with decorated nanoparticles. Nanosheets assembled petal of the flower with an average thickness of similar to 10 nm. Ammonia (NH3) gas sensing analysis revealed that ZnO nanoflower (synthesized with a zinc nitrate and NaOH precursor ratio of 0.1:0.15) showed higher gas response compared with other ZnO nanoflowers synthesized using different precursor ratio. ZnO nanoflower possessed good response (45 s) and recovery time (17 s) at room temperature. (C) 2018 Elsevier B.V. All rights reserved.