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Ag NANOPARTICLES LOADING EFFECTS ON ACETONE AND ETHANOL SENSING PROPERTIES OF NANOSTRUCTURED ZnOAuthor: Vasant Chaitanya Mahipala 201564018 Date: 2022-07-30 Report no: IIIT/TH/2022/101 Advisor:Tapan Kumar Sau AbstractAcetone sensors find applications in healthcare, environmental, food, agriculture, and industrial fields. Semiconducting metal oxide (SMO)-based acetone sensors are costeffective, stable, and could be user-friendly and portable. In SMO-based acetone sensors, interferents like alcohol, which is structurally and chemically similar to acetone, impair the usability of the sensor. In this experimental study, we have investigated how Ag nanoparticles loading onto nanostructured ZnO materials improves the sensor performance, including the selectivity towards acetone gas over ethanol. The sensor involves facile chemical synthesis methods for nanostructured ZnO preparation and preparation/loading Ag nanomaterials onto ZnO. We have varied the Ag nanoparticle loading to see its effect on the acetone sensing performance. Ag is the cheaper noble metal and has been widely used in optoelectronics fields. UV-visible spectrophotometry, Raman scattering spectroscopy and field emission scanning electron microscopy (FESEM) have been used to characterize the sensor materials. It is found that an optimal Ag nanoparticle loading onto nanostructured ZnO shows remarkable acetone selectivity with high sensor response, fast response and recovery at relatively low working temperature compared to pristine ZnO. The nanostructured ZnO/Ag sensor material does not exhibit any interference from water vapor, a significant constituent of the air and exhaled breath. Furthermore, the sensor response and logarithmic acetone concentration yield a good linearity relationship which suggests suitable nanostructured ZnO/Ag material has immense potential as a sensitive and selective low-cost acetone sensor. Full thesis: pdf Centre for Computational Natural Sciences and Bioinformatics |
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