Abstract
Copper oxide thin films were grown via a nebulizer spray pyrolysis technique using five different solvents. The XRD patterns revealed that the CuO films prepared with alcoholic solvents are more crystalline andRaman analysis confirmed the crystalline quality of the films. The sample was prepared with an ethanolic solvent, producing a hierarchical, fiber-like morphology. EDAX spectra confirmed the presence of copper and oxygen in CuO films. XPS analysis showed a significant reduction of oxygen species in ethanol compared to water as a solvent. The film deposited with an ethanolic solution showed the lowest bandgap of 1.7 eV. PL spectra showed strong emission at 628 nm. Lifetime studies suggest that the enhancement in the decay lifetime of CuO films can be advantageous for optoelectronic applications. CuO thin films deposited with alcoholic solvents exhibited lower resistance values. VOC detection was employed by the CuO-based gas sensors. i.e., acetone, ethanol, and toluene.
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