Fabrication of a room-temperature NO2 gas sensor based on WO3 films and WO3/MWCNT nanocomposite films by combining polyol process with metal organic decomposition method

▶ In this study, we fabricated a room-temperature NO2 gas sensor based on WO3/MWCNT nanocomposite film by combining polyol process with metal organic decomposition method. ▶ The response of the WO3/MWCNT nanocomposite film to NO2 gas increased dramatically when a few MWCNTs were added to the WO3 film. ▶ New electrical paths and depletion layers formed in the WO3/MWCNT nanocomposite film were used to explain the high sensitivity of WO3/MWCNT nanocomposite film.