Properties of ZnO/TiO2 hetero-structures thin films grown by sol-gel with various zinc acetate dehydrated concentration

Abstract

Abstract We have investigated the structural and optical properties of ZnO/TiO 2 hetero-structures thin film with various zinc acetate dehydrates concentration (0.5 M, 1.0 M, 1.5 M, and 2.0 M) grown by sol-gel method. Zinc oxide sol-gel were prepared by dissolving zinc acetate dehydrates as precursor into an ethanol. The solutions were added with triethanolamine as a stabilizer. For preparing the TiO 2 sol-gel, titanium tetraisoproxide (TTIP) was used as precursor and it was dissolved into the ethanol and added with an acetic acid as stabilizer. A glass substrates were cleaned with acetone prior to the thin films was coated on it. The first layer was ZnO thin film and then followed by TiO 2 were deposited into the glass substrates. The ZnO/TiO 2 hetero-structures thin films were inserted into furnace for undertaking the heat thermal at the temperatures of 500 0 C for 60 minutes. X-ray diffraction was used to characterize the structural properties of ZnO/TiO 2 . The optical properties ZnO/TiO 2 were characterized using the optical UV-Vis spectrophotometer measurement. Based on the X-RD results, the peak is clearly observed for ZnO thin films in the plane of (100), (002), and (101), indicating that ZnO in the crystalline phase, while TiO 2 is in the amorphous phase. The optical band gap of the ZnO/TiO 2 hetero-structures thin films for 1.0 M and 1.5 M is 3.150 eV, and 3.153 eV, respectively.

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