Characteristics of ZnO nanowires by Hydrothermal/ Electroplating/ Chemical Vapor Deposited Method for Flexible Field Emission Application

  • 陳 元璋

Student thesis: Master's Thesis

Abstract

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
Date of Award2016 Sep 7
Original languageEnglish
SupervisorChun-Hung Lin (Supervisor)

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