Optical Properties of ZnO, TiO₂ and ZnO:TiO₂ Composite Films

Abstract:

We report a fabrication and characterization of ZnO, TiO₂ and ZnO:TiO₂ composite thin films. The films were prepared on glass substrates by using the dip coating sol-gel method. ZnO was synthesized by using Zinc acetate dehydrated, glacial acetic acid and ethanol. Meanwhile, TiO₂ was prepared by using titanium isopropoxide, acetic acid, isopropyl alcohol and methanol. The single sols were mixed with fixed molarity of 0.2 mol to obtain ZnO:TiO₂ composite films. The optical properties of metal oxide, such as transmittance, absorbance and band gap were determined using UV-Vis spectrometer. FTIR was used to determine the chemical bonds of the materials. ZnO has the highest transmittance spectra (91%), followed by TiO₂ (70%) and ZnO:TiO₂ (35%) composite films. The absorbance edge shifted to the longer wavelength for ZnO:TiO₂ composite film. The energy band gap of ZnO, TiO₂ and ZnO: TiO₂ composite were 3.8 eV, 3.6 eV and 3.5 eV, respectively.

• Periodical: Nano Hybrids and Composites (Volume 31)
• Pages: 25-33
• DOI: https://doi.org/10.4028/www.scientific.net/NHC.31.25
• Online since: February 2021
• Authors: Affa Rozana Abdul Rashid*, Hani Khaliesah Tazri
• Keywords: Composite ZnO:TiO₂, Sol-Gel Method, TiO₂, ZnO

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