Abstract
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∼300 nm and 5∼10 nm, respectively. The CuO nanotube sensor showed responses of 136∼325% for the H₂S concentration of 0.1∼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.
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