| 초록 |
H2S is the toxic and flammable gas, produced in many plants, mines and industries. H2S gas is especially fetal to human body, thus it is important for the H2S detection at low concentration. In this study, the open space CuO nanowires structure was facilely fabricated by the deposition of a copper metal layer on single wall carbon nanotubes (SWCNTs) template following oxidation. SWCNTs template was deposited on the Al2O3 substrate by the arc-discharge method. The Cu nanowires on the SWCNTs templates were oxidized with varying temperatures (400 to 800 ℃) for 2 hours. The morphology and properties of CuO nanowires are characterized by FESEM, Raman spectroscopy, XPS, X-Ray diffraction (XRD), and current-voltage measurements. The H2S gas sensing properties were carried out at different operating temperatures using dry air as carrier gas. The CuO nanowires structure oxidized at 800 ℃ showed the best sensitivity at low operating temperature of 150 ℃. The optimum operating temperature was shifted from 300 ℃ to 150 ℃ when the oxidation temperature increased. It is interpreted that the sensing mechanism is different between lower and higher oxidation temperature. |
