Nanostructured ZnO Films Prepared by Modified Thermal Oxidation of Zinc Film Deposited on Mesh Substrate

Authors

  • Thongchai Phantadaporn คณะวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยธรรมศาสตร์ (ศูนย์รังสิต)
  • Kamon Aiempanakit

Abstract

Zinc oxide (ZnO) nanostructures were prepared by electrochemical deposition on a stainless steel mesh substrate (SSM) at a potential difference of 4 volts. Oxidation temperatures of 300, 500, and 700°C for 1 hour were used to modify the crystal structure and morphology of the ZnO films. The morphological and structural properties of the ZnO films were analyzed with a field emission scanning electron microscope (FE-SEM) and x-ray diffractometer (XRD), respectively. The results indicated that the ZnO films exhibited the crystal structure of hexagonal wurtzite. The crystallinity and crystalline size improved with increasing oxidation temperature. The highest crystalline size of ZnO was about 29.82 nm for an oxidation temperature of 700°C. The ZnO films showed morphology of nanosheet structure with a hydrophobic surface of water contact angle about 148.2° ± 1.3°. All ZnO films were tested for their photocatalytic properties with degradation of methylene blue (MB) solution for various ultraviolet (UV) irradiation time. The results showed that oxidation temperature significantly affected both the crystal structure and photocatalytic activity of ZnO films. The ZnO films prepared at a temperature of 700°C exhibited the best degradation of MB solution of about 75.23%. Keywords: ZnO, thermal oxidation, nanostructure, photocatalytic activity    

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2022-05-18

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บทความวิจัยจาก The 38th International Conference of the Microscopy Society of Thailand