| Summary: | 碩士 === 國立成功大學 === 光電科學與工程學系 === 104 === In the development of displays, a large scale systems will begin to downsize and improve its performance, such as weight reduction, high brightness, low cost and low power consumption. The nanowire field emission display/lighting have consistent with the development of the above requirements. ZnO nanowires can be also based on to construct gas sensors, chemical sensors, biosensors, UV sensors, pH sensors and other sensors with different sensing mechanisms.
In this study, hydrothermal method and electroplating method as the main process to grow zinc oxide nanowires used in field emission cathode. The zinc acetate dihydrate was formulated as ethanol solution before the process, and then we coated the seed layer by spin coater, we used zinc nitrate hexahydrate solution to deposit zinc oxide nanowires. Besides, in order to understand the performance of nanowire with hydrothermal method and electroplating method, we also produce a relatively stable process such as chemical vapor deposition (CVD) as contrast. The results that indicated that hydrothermal/electroplating methods are not only simpler than CVD, but also save a lot of cost and time.
In this paper, we also discussed the following parameters: hydrothermal method at different time, growing concentration of the reaction solution, electroplating method at different concentrations and characteristic of zinc oxide and field emission effect. Moreover, in our experiment, high-resolution field emission scanning electron microscope (UHRFE-SEM) was used to measure the morphology of zinc oxide and fluorescence spectroscopy (PL) was used to determine the quality of zinc oxide. Finally, we use field emission measurement system to measure the characteristics of field emission and its optical properties.
In our studies, the result presented that although the growth time of ZnO nanowires by hydrothermal method is longer than the electroplating method, the field emission, density and morphology properties of ZnO film are better than by electroplating method. In our experiment, the best results of field emission enhancement factor is 5340, the turn on field is 8.0 V/μm. Even though this result is not better than the CVD growth; but this process can be performed at a low temperature and atmospheric environment. Therefore, this technique can easily use for low cost field emission and sensor applications. So we invested the ZnO nanowires lighting element to carbon reduction and improving field emission effect.
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