Hydrothermal synthesis of hierarchical NiO nanoparticles loaded SnO2 for acetone gas sensing / Shady Fouad Ahmed Saber

Shady Fouad , Ahmed Saber (2024) Hydrothermal synthesis of hierarchical NiO nanoparticles loaded SnO2 for acetone gas sensing / Shady Fouad Ahmed Saber. Masters thesis, Universiti Malaya.

	PDF (The Candidate's Agreement) Restricted to Repository staff only Download (140Kb)
	PDF (Thesis M.A.) Download (2279Kb)

Abstract

The present study has successfully synthesized a cauliflower-like hierarchy microstructure of NiO: SnO2 through a facile hydrothermal method for acetone detection. Among the sensors evaluated, the sensor synthesized with a NiCl2·6H2O: SnCl2.2H2O molar ratio of 5:100, labeled as K5, exhibited exceptional performance in acetone gas sensing, with a response of 1734 at 1000 ppm at 350 °C, two times more than pristine SnO2. Also, at lower concentrations, the responses were recorded to be 325, 170, 70, and 35 for 200 ppm, 100 ppm, 50 ppm, and 20 ppm acetone balanced in nitrogen, respectively. Moreover, swift response and recovery times of 8 seconds and 2 minutes 18 seconds were recorded at 20 ppm acetone balanced in nitrogen, respectively, at the optimal operating temperature, 350 °C. Also, the sensor was further assessed for its ability to distinguish acetone from other gases by exposing it to equal concentrations of 200 ppm of acetone, carbon dioxide, ammonia, and ethanol, all balanced in nitrogen, and tested at 350°C. Moreover, K5 exhibited exceptional selectivity, with response levels in acetone surpassing those in carbon dioxide, ammonia, and ethanol by factors of 142.74, 143.39, and 2.42 times, respectively. Finally, when tested over five repeated exposure cycles of 200 ppm acetone in nitrogen, K5 displayed remarkable operational stability.

Actions (For repository staff only : Login required)