Abstract
Zinc oxide (ZnO) nanoparticle gas sensor was formed by spin coating. We annealed the film at 400, 600, and 800°C for 1 hour in air to make gas sensor. The responses of gas sensor to ethanol with UV light illumination were investigated. It could be observed that the ZnO nanoparticle film annealing at 800°C has the highest sensitivity. It can be attributed to the defects of ZnO nanoparticle film annealing at 800°C much more than other annealing temperatures. The study shows that the ZnO nanoparticles have potential applications as RT ethanol sensors.
Highlights
Wide bandgap one-dimensional (1D) semiconductor nanostructures such as nanowires [1,2,3,4,5,6] or nanotubes will become the next-generation devices
In reacting with the oxygen species at the oxide surface, the reductive gas reduces the concentration of oxygen species at this surface and thereby increases the electron concentration [22]
We could see that the UV light can enhance the film’s sensitivity, and the film shows good reversibility
Summary
Wide bandgap one-dimensional (1D) semiconductor nanostructures such as nanowires [1,2,3,4,5,6] or nanotubes will become the next-generation devices. ZnO (Zinc Oxide) is a widely used material as photodetector and gas sensor, since it has direct bandgap and special material properties [12, 13]. UV illumination of metal oxides, such as ZnO, is the most studied and promising method to achieve room-temperature sensitivity. Details of the growth of ZnO nanoparticles and the properties of the fabricated ethanol sensor are discussed. This gas sensor device would combine with UV light to sense ethanol gas. Reducing gas, and Rill is sensor’s resistance with UV light illumination. All experiments in this paper were conducted at room temperature and under UV light illumination
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