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Effect of different solvents on ZnO thin films for gas sensing application by nebulizer spray pyrolysis method

Applied Physics A: Materials Science and Processing, ISSN: 1432-0630, Vol: 130, Issue: 9
2024
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Zinc oxide (ZnO) thin films were successfully deposited on glass substrates via the Nebulizer Spray Pyrolysis (NSP) method using various solvents like methanol, ethanol, and deionized (DI) water. The samples underwent subsequent characterization techniques such as X-ray diffraction (XRD), Atomic Force Microscopy (AFM), Energy-dispersive X-ray (EDX), UV-Vis Spectroscopy, Photoluminescence (PL), CIE 1931 Chromaticity, with subsequent calculation of gas detection efficiencies. XRD study confirmed the hexagonal structure of ZnO. Identical and uniformly distributed particles were present on the surface of the thin film, according to AFM analysis. The band gap values ranged from 3.39 to 3.28 eV for the methanol, ethanol, and DI water solvents. The Photoluminescence (PL) intensity of the immobilized zinc oxide thin films was observed at three distinct wavelengths: 416 nm, 480 nm, and 524 nm, confirming the presence of defects in the oxygen-depleted regions. The sensing properties of ZnO thin films to gaseous ammonia were studied, among which the ZnO thin film prepared with DI water exhibited higher sensitivity of 55% at 150 ppm of ammonia (NH) gas at room temperature determining the suitability of the material for commercial gas sensing.

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