| Summary: | 碩士 === 國立臺南大學 === 電機工程研究所 === 98 === In this paper, the ZnO and silver nanoparticles - ZnO nanowires were prepared on the glass substrates by hydrothermal method and were used to make the ultraviolet photodetector and gas sensor. We used the zinc nitrate hexhydrate (Zn (NO3)2. 6H2O) 、 hexamethylenetetramine (C6H12N4) and silver nitrate (AgNO3) to synthesize the silver nanoparticles - ZnO nanowires, without the silver nitrate in front of the three precursor solution namely was the part of no silver nanoparticles. The ZnO nanowires and silver nanoparticles - ZnO nanowires would be analyzed by SEM, XRD and PL equipment. From the SEM image, it can be see that a lot of Ag particles capped on the top of the ZnO nanowires.
For the part of the ultraviolet photodetector, from the photoresponse image, the photoresponse time of the silver nanoparticles - ZnO nanowires is faster to saturate than the ZnO nanowires. For the part of the gas sensor, the ZnO nanowires and silver nanoparticles - ZnO nanowires would be annealed at 300℃ for two hours in the air first, and made a gas sensor to sense ethanol gas at the temperature of 300° after. From the sensitivity, the sensitivity of the silver nanoparticles - ZnO nanowires was three to four times higher than the ZnO nanowires.
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