Fabrication of mesoporous In2O3 nanospheres and their ultrasensitive NO2 sensing properties

Ultra-sensitive NO2 sensor based on hierarchical In2O3 nanospheres which are successfully fabricated via facile thermal processes. Such morphology evolution is investigated by the time-dependent experiment. Remarkable features of the mesoporous structure and, large specific area (82.1 m(2)/g) and small sized nanoparticles result in the In2O3 nanospheres a high NO2 sensing efficiency. For the In2O3 based NO2 sensor, temperature of annealing process is an important factor to influence its sensing performance; the rather high sensitivity (360.1, 100 ppb) and low detection limit (1 ppb) are realized at 120 degrees C for the sample that annealed at 500 degrees C. Based on the preferable sensing performance, the novel In2O3 sensor is believed to be promising to be applied for practised NO2 detecting. (C) 2017 Elsevier B.V. All rights reserved.