The Synthesis and Field Emission Properties of Zinc Oxide/Zinc Tungstate Composite Nanorods

• Main Authors: Kuo-Ting Chu, 朱國廷
• Other Authors: Bohr-Ran Huang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/19044187676724816955

碩士 === 國立臺灣科技大學 === 電子工程系 === 100 === Synthesis of one-dimensional (1-D) zinc oxide nanostructures (ZnO) based on vapor-solid (V-S) mechanism by chemical vapor deposition (CVD) method usually utilize low active metal catalysts, such us gold (Au), platinum (Pt) and silver (Ag). In this work, the researcher utilizes tungsten thin film as the catalyst, the experiment reveals the synthesis of ZnO nanorods by chemical vapor deposition method at 550 °C which discovered the zinc tungstate nanostructures (ZnWO4) under ZnO nanorods by Raman spectrum and XRD patterns due to the tungsten catalyst were easily reactive with other gases in the furnace of the chemical vapor deposition system. Thus, ZnO/ZnWO4 composite nanorods were been synthesized by tungsten catalyst. Furthermore, the photoluminescence spectrum (PL) indicates the UV emission of ZnO/ZnWO4 composite nanorods possess the blue shift phenomenon compared to the pure ZnO nanorods. In addition, the field emission properties of ZnO/ZnWO4 composite nanorods includes a turn-on field (Eon) of 3.55 V/μm and a enhancement factor (β) of 1839, both better than found in ZnO nanorods without ZnWO4 nanostructures. Finally, the research mixed nitrogen and oxygen with the ratio of 10:1 to annealing ZnO/ZnWO4 composite nanorods at 300 °C, 400 °C and 500 °C, respectively. The result shows the best temperature was 400 °C to enhance the field emission properties of ZnO/ZnWO4 composite nanorods. The field emission properties of the annealing ZnO/ZnWO4 composite nanorods at 400 °C includes a turn-on field of 3.05 V/μm, a threshold field (Eth) of 4.05 V/μm and a enhancement factor of 2342, both better than found in as-grown ZnO/ZnWO4 composite nanorods.