Preparing large-scale WO3 nanowire-like structure for high sensitivity NH3 gas sensor through a simple route

► Simple preparation of large-scale WO3 nanowires gas sensors. ► Good performance of WO3 nanowires gas sensor was obtained. ► Nanocrystallines boundary is the dominant parameter controlling the sensing mechanism. ► WO3 nanowires have high response to NH3 gas.