H2S Gas Sensing Properties of CuO Nanotubes

CuO nanotubes are synthesized using TeO2 nanorod templates for application to H2S gas sensors. TeO2 nanorod templates were synthesized by using the VS method through thermal evaporation. Scanning electron microscopy, transmission electron microscopy and X-ray diffraction showed that the synthesized nanotubes were monoclinic-structured polycrystalline CuO with diameter and wall thickness of approximately 100 similar to 300 nm and 5 similar to 10 nm, respectively. The CuO nanotube sensor showed responses of 136 similar to 325% for the H2S concentration of 0.1 similar to 5 ppm at room temperature. These response values are approximately twice as high as that of the CuO nanowire sensor for the same concentrations of H2S gas. Along with the investigation of the performance of the sensors, the mechanisms of H2S gas sensing of the CuO nanotubes are also discussed in this study.