Structural,optical, and H2 gas sensing analyses of Cr doped CuO thin films grown by ultrasonic spray pyrolysis |
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| Affiliation: | 1. Vocational School, Department of Electric and Energy, Ağrı İbrahim Çeçen University, Ağrı-Turkey;2. Kazım Karabekir Education Faculty, Department of Science Education, Atatürk University, Erzurum-Turkey;3. Hınıs Vocational School, Department of Medical Services and Techniques, Atatürk University, Erzurum-Turkey;4. Department of Physics, Art & Science Faculty, Erzincan Binali Yıldırım University, Erzincan-Turkey;5. Department of Electrical and Electronics Engineering, Faculty of Engineering, Atatürk University, Erzurum-Turkey;6. Department of Physics, Faculty of Science, Atatürk University, Erzurum-Turkey;1. Department of Chemical Engineering, Bangladesh University of Engineering and Technology, Dhaka, 1000, Bangladesh;2. Department of Farm Power and Machinery, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh;3. Department of Applied Chemistry and Chemical Engineering, University of Dhaka, Dhaka, Bangladesh;4. Department of Biomedical and Chemical Engineering and Sciences, Florida Institute of Technology, Melbourne, FL 32901, USA;1. School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun 113001, Liaoning, China;2. Graduate School, Liaoning Petrochemical University, Fushun 113001, Liaoning, China;3. Shanxi Normal University, Taiyuan 030000, Shanxi, China;1. PG & Research Department of Physics, Bishop Heber College (Autonomous) (Affiliated to Bharathidasan University), Tiruchirappalli, 620 017, Tamil Nadu, India;2. Department of Physics & Research Centre, Scott Christian College (Autonomous) (Affiliated to Manonmaniam Sundaranar University, Tirunelveli), Nagercoil, 629001, Tamil Nadu, India |
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| Abstract: | Here, a specific metal oxide (CuO) and its impurity (Cr) added composites were grown onto glass substrates as nanostructured thin films by executing ultrasonic spray pyrolysis method. The effects of the varied Cr dopant concentration on the morphological, structural, optical and H2 gas sensor properties of the synthesized CuO thin films were determined by conducting scanning electron microscopy, X-ray Diffraction, X-ray photoelectron spectroscopy, photoluminescence spectroscopy, ultraviolet–visible spectroscopy, and gas detection analyses. The X-Ray Diffraction analysis revealed the presence of CuO crystals with predominant (111) plane and it changed to (002) orientation for the doped samples, where crystallite sizes varied between 32 and 46 nm. The structural studies disclosed that the crystalline structure modified due to the added impurities. The scanning electron microscopy observations unveiled polyhedron-like shape formations of the synthesized nanostructures which also showed clear indications of changed morphology due to the impacts of different Cr doping percentages. Besides, the presence of copper, oxygen, and chromium was confirmed by EDX elemental analysis as well as X-ray photoelectron spectroscopy. The optical examination concluded that absorbance values followed a random trend with respect to the increased impurity contents while bandgap decreased with the increase of doping concentration. And, it was also noted that the luminescent emission peaks decreased in the photoluminescence spectroscopy as a result of introduced impurity levels. Finally, H2 responsivity was detected for the grown films and found out that the impurity doping notably increased the sensitivity of the gas sensor based on the prepared CuO nanostructures. |
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| Keywords: | CuO thin films Ultrasonic spray pyrolysis XRD Bandgap PL |
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