A selective NH3 gas sensor based on (Ag2O)1-x(SnO2)x nanocomposites thin films at various operating temperatures
The pulsed laser deposition (PLD) technique was used to prepare the (Ag2O)1-x(SnO2)x nanocomposite thin films with different ratios of x=0, 0.2 and 0.4wt and deposited on glass substrates. The films were subsequently annealed in the air for two hours at 300 °C. The (Ag2O)1-x(SnO2)x nanocomposite w...
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University of Baghdad, College of Science for Women
2023-09-01
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| Series: | مجلة بغداد للعلوم |
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| Online Access: | https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/8117 |
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| author | Nada Mohammed Abas Anwar Ali Baqer |
| author_facet | Nada Mohammed Abas Anwar Ali Baqer |
| author_sort | Nada Mohammed Abas |
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The pulsed laser deposition (PLD) technique was used to prepare the (Ag2O)1-x(SnO2)x nanocomposite thin films with different ratios of x=0, 0.2 and 0.4wt and deposited on glass substrates. The films were subsequently annealed in the air for two hours at 300 °C. The (Ag2O)1-x(SnO2)x nanocomposite was confirmed to have formed by the x-ray diffraction (XRD) investigation. According to field emission scanning electron microscopy (FESEM), the created (Ag2O)1-x(SnO2)x particles were spherical in shape. Energy Dispersive X-Ray Analysis (EDX) is used to confirm the elements in composite films. Atomic Force Microscopy (AFM) analysis shows that the produced films had grains size between 37.68 - 49.57nm and root mean square (RMS) roughness of 4.92-8.22nm. The prepared films have a direct energy gap between 2.06 and 3.36 eV, according to UV-visible (UV-Vis) spectrometer data. The films have been tested for NH3 sensing under various operating temperatures. The observed variations in the gas sensing response's thin film resistance are suggestive of either n-type or p-type conductivity. When reducing gas is present, the resistance of (Ag2O)1-x(SnO2)x films increases when x=0, 0.2wt , indicating that the films are p-type, however, the thin film exhibits the reverse behavior at x=0.4wt, indicating that it is n-type. Additionally, all films produced showed a significant sensitivity to NH3 gas at 95 ppm concentration. The Ag2O thin film had a sensitivity of 50.5% at an operating temperature of 200°C with response and recovery times of 22.5 and 39.6 seconds, respectively. Furthermore, composite thin films showed greater sensitivity than pure silver oxide thin films.
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| format | Article |
| id | doaj-art-83b7df37670c493d9b1be88cc4a455cd |
| institution | DOAJ |
| issn | 2078-8665 2411-7986 |
| language | English |
| publishDate | 2023-09-01 |
| publisher | University of Baghdad, College of Science for Women |
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| series | مجلة بغداد للعلوم |
| spelling | doaj-art-83b7df37670c493d9b1be88cc4a455cd2025-08-20T02:52:27ZengUniversity of Baghdad, College of Science for Womenمجلة بغداد للعلوم2078-86652411-79862023-09-0121410.21123/bsj.2023.8117A selective NH3 gas sensor based on (Ag2O)1-x(SnO2)x nanocomposites thin films at various operating temperaturesNada Mohammed Abas0https://orcid.org/0000-0002-7170-2582Anwar Ali Baqer1https://orcid.org/0000-0001-8033-8826Department of Physics, College of Science for Women, University of Baghdad, Baghdad, IraqDepartment of Physics, College of Science for Women, University of Baghdad, Baghdad, Iraq The pulsed laser deposition (PLD) technique was used to prepare the (Ag2O)1-x(SnO2)x nanocomposite thin films with different ratios of x=0, 0.2 and 0.4wt and deposited on glass substrates. The films were subsequently annealed in the air for two hours at 300 °C. The (Ag2O)1-x(SnO2)x nanocomposite was confirmed to have formed by the x-ray diffraction (XRD) investigation. According to field emission scanning electron microscopy (FESEM), the created (Ag2O)1-x(SnO2)x particles were spherical in shape. Energy Dispersive X-Ray Analysis (EDX) is used to confirm the elements in composite films. Atomic Force Microscopy (AFM) analysis shows that the produced films had grains size between 37.68 - 49.57nm and root mean square (RMS) roughness of 4.92-8.22nm. The prepared films have a direct energy gap between 2.06 and 3.36 eV, according to UV-visible (UV-Vis) spectrometer data. The films have been tested for NH3 sensing under various operating temperatures. The observed variations in the gas sensing response's thin film resistance are suggestive of either n-type or p-type conductivity. When reducing gas is present, the resistance of (Ag2O)1-x(SnO2)x films increases when x=0, 0.2wt , indicating that the films are p-type, however, the thin film exhibits the reverse behavior at x=0.4wt, indicating that it is n-type. Additionally, all films produced showed a significant sensitivity to NH3 gas at 95 ppm concentration. The Ag2O thin film had a sensitivity of 50.5% at an operating temperature of 200°C with response and recovery times of 22.5 and 39.6 seconds, respectively. Furthermore, composite thin films showed greater sensitivity than pure silver oxide thin films. https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/8117Ag2O- SnO2, Nanocomposites, NH3 gas sensor, Operating temperatures, Pulsed laser deposition. |
| spellingShingle | Nada Mohammed Abas Anwar Ali Baqer A selective NH3 gas sensor based on (Ag2O)1-x(SnO2)x nanocomposites thin films at various operating temperatures مجلة بغداد للعلوم Ag2O- SnO2, Nanocomposites, NH3 gas sensor, Operating temperatures, Pulsed laser deposition. |
| title | A selective NH3 gas sensor based on (Ag2O)1-x(SnO2)x nanocomposites thin films at various operating temperatures |
| title_full | A selective NH3 gas sensor based on (Ag2O)1-x(SnO2)x nanocomposites thin films at various operating temperatures |
| title_fullStr | A selective NH3 gas sensor based on (Ag2O)1-x(SnO2)x nanocomposites thin films at various operating temperatures |
| title_full_unstemmed | A selective NH3 gas sensor based on (Ag2O)1-x(SnO2)x nanocomposites thin films at various operating temperatures |
| title_short | A selective NH3 gas sensor based on (Ag2O)1-x(SnO2)x nanocomposites thin films at various operating temperatures |
| title_sort | selective nh3 gas sensor based on ag2o 1 x sno2 x nanocomposites thin films at various operating temperatures |
| topic | Ag2O- SnO2, Nanocomposites, NH3 gas sensor, Operating temperatures, Pulsed laser deposition. |
| url | https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/8117 |
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