Abstract
Hexamethylenetetramine (HMT)-mediated rutile and polycrystalline TiO2 films are directly grown on a glass substrate by a simple chemical wet deposition method at ambient temperature. After confirming the crystallinity, phase-purity and surface morphology, as-grown TiO2 films were explored for a variety of target gases including nitrogen dioxide, methanol, ethanol and ammonia at different temperatures for confirming the sensor application potential. The TiO2 film shows a maximum response of 43% to 100ppm NO2@180°C with fast response time of 16s. In addition, the TiO2 sensor film has potential to detect concentration of NO2 as low as 10ppm.
[Display omitted]
•Facial synthesis strategy for the formation polycrystalline TiO2 films.•XRD and Raman analysis confirms the rutile phase of TiO2.•TiO2 films were highly sensitive and selective towards NO2 gas@180°C.•TiO2 film is able to detect as low as 10ppm NO2 concentration.