... candidate for acetone detection at about room temperature. Design/methodology/approach ZnO nanoparticles doped with CuO were prepared by sol-gel method, and the structure and morphology were characterized via X-ray diffraction, scanning electron microscope, energy dispersive spectroscopy and Brunauer...

.... Design/methodology/approach The ethylene sensor has been fabricated using TiO₂–WO₃ composite material through the sol-gel method. Findings The sensitivity of the sensor obtained using the pre-calibrated ethylene is found to be 46.2 per cent at 200 ppm ethylene concentration...