University of Zululand
Palladium (pd) decorated zinc oxide (ZnO) nanoparticles for gas sensing applications: meat spoilage gases
Abstract
dc:description.abstractThe detection of odours emitted by meat products when they start to spoil remains a challenge. In response to this, materials of ZnO decorated with palladium nanoparticles were synthesised using the hydrothermal method for the purpose of testing their gas sensing properties. After the synthesis of these nanoparticles, various characterization techniques for the investigation of both physical and chemical properties were employed. Different percentages of Palladium ranging between 0.2% and 0.7% from a PdCl2 precursor with 99.9% purity were used during the synthesis. A gas sensor was fabricated through the drop casting method on a gold grid. These gas sensor samples were exposed to both reducing and oxidizing gases. Sensing was performed at a temperature from 25°C to 225°C. The best result was obtained at 150°C using 0.2%Pd-ZnO sensor for NO2 gas sensing. A sensitivity of 3.8 was recorded, with both response time and recovery time of 3.5 minutes. The 0.5%Pd-ZnO sensor performs well at room temperature for CO2, SO2, and ethanol gases. OKUHUNYUSHWE NGOLIMI LWESIZULU Ukutholakala kwephunga elikhishwa yinyama lapho isiqala ukubola kuseyinselelo. Ukuphendula lokhu, izinto ze-ZnO ezihlotshiswe nge-palladium (Pd) nanoparticles zahlanganiswa kusetshenziswa indlela ye-hydrothermal ngenhloso yokuhlola izakhiwo zabo zokuzwa igesi. Ngemva kokuhlanganiswa kwalawa ma-nanoparticles, kwasetshenziswa amasu ahlukahlukene kucutshungulwa izakhiwo ezingokomzimba nezamakhemikhali. Amaphesenti ahlukene e-Palladium aphakathi kuka-0.2% no-0.7% kusukela ku- PdCl2 eyandulelayo enobumsulwa obungu-99.9% asetshenziswe ngesikhathi sokuhlanganiswa. Inzwa yegesi yakhiwe ngendlela yokulahla phansi kugridi yegolide. Lawa masampula enzwa yegesi avezwe kukho kokubili amagesi anciphisa nawoku-oxidizing. Ukuzwa kwenziwa ezingeni lokushisa elisuka ku-25°C kuya ku-225°C. Umphumela omuhle kakhulu utholwe ku-150°C kusetshenziswa inzwa engu-0.2% Pd-ZnO yenzwa yegesi engu- NO2. Ukuzwela kwe-3.8 kwarekhodwa, nakho kokubili isikhathi sokuphendula nesikhathi sokuthola kabusha semizuzu ye-3.5. Inzwa engu-0.5% Pd-ZnO isebenza kahle ekamelweni lokushisa le- CO2, SO2, kanye negesi ye-ethanol.
Degree
thesis:*- Grantor dc:publisher.institution
- University of Zululand
- Year dc:date.issued
- 2024
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Manqele, K.B.