Effect of Au Nanoparticles on Mitigating Negative Effect of Humidity on ZnO-Based Gas Sensors

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dc.contributor.authorAlaghmandfard, Amirhossein
dc.contributor.supervisorHoorfar, Mina
dc.date.accessioned2024-01-22T22:54:36Z
dc.date.available2024-01-22T22:54:36Z
dc.date.copyright2024en_US
dc.date.issued2024-01-22
dc.degree.departmentDepartment of Mechanical Engineeringen_US
dc.degree.levelMaster of Applied Science M.A.Sc.en_US
dc.description.abstractThis thesis presents ZnO-based gas sensors for the detection of analytes, using Au nanoparticles to reduce the destructive effects of humidity on gas detection. The ZnO nanostructures are fabricated using the thermal decomposition method for different lengths of time and at varying temperatures. These structures are characterized by the X-ray diffraction technique, revealing the wurtzite hexagonal close-packed ZnO structures. In addition, scanning electron microscopy is employed to characterize the morphology of the synthesized ZnO structures. The results show that the length of ZnO nanostructures increases by raising the calcination temperature for 12 hours. The changes in the electrical current of the sensor are studied to determine the presence of target gases at various concentrations. The results show that the ZnO nanostructures prepared at 380 oC revealed the best response toward different humidity levels due to a higher number of oxygen vacancies, which are perfect sites to react with the target gas molecules. After selecting the best ZnO-based sensor, Au nanoparticles are sputtered onto the ZnO nanostructures with different thicknesses. Based on the results, the 0.1-nm-thick Au layer creates the best sensors to reduce the effect of humidity while demonstrating a constant response toward the target gas at different humidity levels. The sensor also shows good sensitivity and selectivity toward the triethylamine gas target with a response of 17.57, which is 62.75, 60.59, 4.81, 8.29, 4.30, 42.85, 70.28, and 292.83 times higher than the response toward Acetone, Methanol, Diethyleneamine, Benzene, Toluene, Ethanol, 1-propanol, and H2, respectively. This sensor revealed fast response and recovery times of 9.8 s and 4.4 s, respectively and promising stability over 24 days.en_US
dc.description.scholarlevelGraduateen_US
dc.identifier.bibliographicCitationAlaghmandfard A, Sedighi O, Rezaei NT, Abedini AA, Khachatourian AM, Toprak MS, Seifalian A. Recent advances in the modification of carbon-based quantum dots for biomedical applications. Materials Science and Engineering: C. 2021 Jan 1;120:111756.en_US
dc.identifier.bibliographicCitationAlaghmandfard A, Madaah Hosseini HR. A facile, two-step synthesis and characterization of Fe 3 O 4–L Cysteine–graphene quantum dots as a multifunctional nanocomposite. Applied nanoscience. 2021 Mar;11(3):849-60.en_US
dc.identifier.bibliographicCitationSedighi O, Alaghmandfard A, Montazerian M, Baino F. A critical review of bioceramics for magnetic hyperthermia. Journal of the American Ceramic Society. 2022 Mar;105(3):1723-47.en_US
dc.identifier.bibliographicCitationAlaghmandfard A, Ghandi K. A comprehensive review of graphitic carbon nitride (g-C3N4)–metal oxide-based nanocomposites: Potential for photocatalysis and sensing. Nanomaterials. 2022 Jan 17;12(2):294.en_US
dc.identifier.bibliographicCitationMontazerian M, Baino F, Fiume E, Migneco C, Alaghmandfard A, Sedighi O, DeCeanne AV, Wilkinson CJ, Mauro JC. Glass-ceramics in dentistry: Fundamentals, technologies, experimental techniques, applications, and open issues. Progress in Materials Science. 2023 Feb 1;132:101023.en_US
dc.identifier.urihttp://hdl.handle.net/1828/15838
dc.languageEnglisheng
dc.language.isoenen_US
dc.rightsAvailable to the World Wide Weben_US
dc.subjectZinc Oxide Semiconductorsen_US
dc.subjectAu Nanoparticlesen_US
dc.subjectTriethylamineen_US
dc.subjectGas Sensoren_US
dc.subjectHumidity Effectsen_US
dc.titleEffect of Au Nanoparticles on Mitigating Negative Effect of Humidity on ZnO-Based Gas Sensorsen_US
dc.typeThesisen_US

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