IIIT Hyderabad Publications |
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Exploring Pure and Modified ZnO Nanoflowers-Based Acetone and Ethanol Gas SensorsAuthor: Abhijeet Thakur Date: 2019-01-07 Report no: IIIT/TH/2019/11 Advisor:Tapan Kumar Sau AbstractGas sensors find many applications in the biomedical and industrial fields. Among various gas sensors, sensors for the detection and measurement of acetone and ethanol are very important. We explored here the sensing properties of flower-shaped nanoparticles of pure zinc oxide (ZnO), an n-type semiconducting metal oxide, and Ag and Pd nanoparticle-modified ZnO nanoflower systems towards the sensing and detection of acetone and ethanol. The nanoparticles were prepared by literature-reported methods. We demonstrated that pure ZnO nanoflowers showed high sensitivity and very fast response and recovery times towards both the gases. The sensors showed a significant sensor response even at 1 ppm concentration of the target gas. We demonstrated that the selectivity preference for the gases could be modulated by loading metal nanoparticles onto the surface of the ZnO nanoflowers. The sensors had no interference from water vapor and CO2. Further, the sensors showed excellent sensing cycle reversibility. Such sensors can be promising candidates as industrial and environmental gas sensors. Full thesis: pdf Centre for Computational Natural Sciences and Bioinformatics |
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