Tunable Optical and Sensing Properties of CdO and CdO-In2O3 thin Films for NH3 Detection
J. Environ. Nanotechnol., Volume 13, No 4 (2024) pp. 546-552
Abstract
The composition, surface properties, optical characteristics, and sensing capabilities of the films were analyzed using XRD, AFM, and UV-Vis spectroscopy techniques. An average crystallite size of 76-93 nanometers was confirmed by x-ray diffraction studies of CdO and In2O3 composite nano films phases. The addition of In2O3 increased the energy band gap from 3.2 to 3.6 eV according to UV-Vis absorption spectrum, which is expected due to changes in crystallite size. AFM analysis of the thin films indicated homogeneous surfaces, and average particle size in the nanoscale range of 51.5 nm, depending on the mixing ratio. At an NH3 gas concentration of 46 ppm, the composite films of CdO and In2O3 showed the highest sensitivity to NH3 gas (91.4%) at room temperature.
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