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High-Efficiency Photo-Generated Charges of ZnO/TiO2 Heterojunction Thin Films for Photocatalytic and Antibacterial Performance

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Forming heterostructures based on hybrid photocatalysts has been considered as one of the most effective techniques for improving the photocatalytic efficacy of semiconductor photocatalysts. To address this issue, this article describes ZnO/TiO2 heterojunction thin films that were produced via the direct current reaction magnetron sputtering technique and with varying thickness of TiO2 coating. The structural, morphological, and optical features were thoroughly characterized by X-ray diffraction, scanning electron microscope, photoluminescence, and ultra-violet-visible transmission spectra. The photocatalytic and antibacterial ability were assessed by the photo-degradation of methyl orange (MO) aqueous solution and count method of E. coli bacteria. The results demonstrated that the photocatalytic and antimicrobial efficacy of the ZnO/TiO2 heterojunction was found to vary depending on the morphology of the TiO2 layer. In addition, their photocatalytic (91% MO degradation within 150 min) and antimicrobial efficacy (92.7% antibacterial efficiency within 90 min) were higher than the efficiency of either material alone. This could can be ascribed to the photogenerated charge carrier efficiency and hierarchical nanostructure with a large surface area. The mechanism for the improved photocatalytic performance has been discussed in detail.
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Keywords: Photocatalytic Activity; Two-Dimensional; ZnO/TiO2; p–n Heterojunction

Document Type: Research Article

Affiliations: 1: University of Science, District 5, Ho Chi Minh City, 700000, Vietnam 2: Dong Thap University, Ward 6, Cao Lanh City, Dong Thap Province, 870000, Vietnam 3: Department of Energy Science, Sungkyunkwan University (SKKU), Suwon, Kyunggi, 440-746, Korea 4: FM&D Laboratory, Institute of Fundamental and Applied Sciences, Duy Tan University (DTU), Ho Chi Minh City, 70000, Vietnam 5: College of Information and Communication Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea

Publication date: April 1, 2020

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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