Little Lime Hydrangea Nanostructure of WO3 films for Gas Sensor and Antibacterial Applications

Abstract

In this study, electron beam evaporation was used to prepare nanostructured tungsten trioxide (WO₃) thin films on glass substrates at room temperature and subsequently annealed at different temperatures. The microstructure of the WO₃ films changed from nanoflakes to a little lime hydrangea structure upon variation of the annealing temperature. The surface roughness of the films increased from 14.2 nm (as deposited) to 28.5 nm (673K annealed WO₃). The WO₃ sensor possesses excellent selectivity towards hydrogen gas. The antibacterial activity was experimentally studied using Pseudomonas aeruginosa and this result shows excellent antibacterial activity in annealed WO₃ films.