Abstract
Copper oxide (CuO) gas sensors have been designed via nebulizer spray pyrolysis onto the glass substrate using different cationic precursors. XRD analysis confirmed that the prepared CuO films with monoclinic structure and the porous morphology was observed for copper acetate precursor solution from SEM analysis. EDAX and XPS analysis revealed a near stoichiometric ratio of copper and oxygen in the films. The temperature-dependent resistivity measurements were measured using the four-probe technique. The optical band gap was calculated from 1.5 eV to 1.9 eV and the photoluminescence emission peak was recorded at 628 nm. From the TRPL analysis, the A: CuO film attained a maximum average lifetime (τavg) of 0.495 ns. The porous structure of the A: CuO sensor operating at room temperature exhibits high sensitivity, fast response and recovery speed for acetone, ethanol and toluene gas detection (16 s/47 s, 9 s/12 s and 6 s/38 s).
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