Highly reactive 0D ZnS nanospheres and nanoparticles for formaldehyde gas-sensing properties

Wurtzite zero dimensional ZnS nanospheres and random-shaped nanoparticles successfully synthesized via a low temperature hydrothermal route. The formation of nanostructures is attributed due to PVP and thiourea and discussed in details. The as-prepared nanostructures were characterized by XRD, EDS, SEM and HRTEM. Based on experimental results, a plausible growth mechanism is also proposed along with crystal structure of ZnS. The gas-sensing properties of as-prepared ZnS products are tested using efficient substrate sensors via an intelligent gas testing system. Both at room and 100-400 degrees C temperature, high response and selectivity towards formaldehyde than other gases is observed. Comparative studies of ZnS nanostructures for different concentrations of formaldehyde gas and definite sensor-stability for different gases is studied, as well. (C) 2016 Elsevier B.V. All rights reserved.