Ethanol Gas Sensing Properties of In 2 O 3 Nanowires Coated with Co 3 O 4 Nanoparticles

nanowires were coated with nanoparticles to investigate the improvement of ethanol gas sensing performance compared with as-synthesized nanowires. Scanning electron microscopy showed that the nanowires synthesized by VLS mechanism had diameters and lengths of approximately 50-100 nm and a few micrometers, respectively. nanoparticles produced by hydrothermal method was in the size range of a few to a few tens nm. As-synthesized and nanoparticles coated nanowires sensors exhibited responses of 1.96% and 4.57%, respectively for the ethanol gas concentration of 200 ppm at . The underlying mechanism for the improved responses of nanoparticles coated nanowires sensors is discussed.