Fabrication of a low-concentration H2S gas sensor using CuO nanorods decorated with Fe2O3 nanoparticles

The detection of H2S gas at low concentrations for the diagnosis of halitosis is examined. The H2S sensor is composed of CuO nanorods decorated with Fe2O3 nanoparticles. Diagnostic sensors must be able to detect gases in low concentrations. Therefore, to produce a highly sensitive device, CuO nanorods were decorated with metal oxide semiconductor nanoparticles, which doubled the sensitivity. In addition, the selectivity of the sensor improved in comparison with that of the bare CuO nanorod sensor. Here we report the fabrication and testing of a hybrid-structured gas sensor for detecting H2S gas at low concentrations. Furthermore, we report the mechanism by which the sensitivity of the composite sensor is improved.