Effects of molarity on structural,optical, morphological and CO2 gas sensing properties of nanostructured copper oxide films deposited by spray pyrolysis |
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| Affiliation: | 1. Semiconductor Materials and Metallic Oxides laboratory, Physics Department, University of Sciences and Technology Houari Boumediene (USTHB), El-Alia 32, 16111 Bab Ezzouar, Algiers, Algeria;2. Division of Thin Films, Surface and Interface, Research Center in Semiconductors Technology for Energetics (CRTSE), 7 Merveilles, 16038 Algiers, Algeria;3. Thin Films and Semiconductors Laboratory, University of Sciences and Technology, Algiers, Algeria;1. Network of Institutes for Solar Energy (CSIR-NISE), Physics of Energy Harvesting Division, CSIR–National Physical Laboratory, India;2. Academy of Scientific and Innovative Research (AcSIR), CSIR-NPL Campus, New Delhi, Dr. K.S. Krishnan Marg, New Delhi 110012, India;1. College of Life Science and Technology, Hebei Normal University of Science & Technology, Qinhuangdao 066600, PR China;2. Beijing University of Chinese Medicine Dongfang College, Langfang 065001, PR China;3. College of Chemical Technology, Shijiazhuang University, Shijianzhuang 050035, PR China;1. Moldova State University, A. Mateevici 60, MD-2009 Chisinau, Republic of Moldova;2. Kazan Federal University, Kremlevskaya 18, 420008 Kazan, Russia |
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| Abstract: | In this paper, we have exposed the effects of molarity on structural, optical, morphological and gas sensing properties of copper oxide films deposited by pneumatic spray pyrolysis method. The molar concentration was varied from 0.05 to 0.3 M. X-ray diffractograms showed the formation of a single phase CuO for films prepared with 0.05 and 0.1 M concentrations. A secondary phase Cu2O was obtained for 0.2 and 0.3 M concentrations. Optical measurements showed that 0.05 M concentration provides a film with the best transparency in the visible and near infrared regions. The thickness values were between 2 and 110 µm. Moreover, the contact angle measurements have shown that all the deposited films are hydrophobic with angles between 103° and 121°. The morphological properties were investigated using SEM and AFM. According to SEM and AFM micrographs, 0.05 M is the concentration that leads to porous structure. The gas sensing measurements confirm that this porous surface structure is the most sensitive to different CO2 concentrations. |
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| Keywords: | Copper oxide Metal oxide semiconductor Spray pyrolysis Gas sensor |
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