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Field emission characteristics of ZnO nanotetrapods and the effect of thermal annealing in hydrogen

查看全文 作　　者：CHEN [1]HongSheng;QI [1]JunJie;ZHANG [1,2]Yue;LIAO [1]QingLiang;ZHANG [1]XiaoMei;HUANG [1]YunHua 高影响力作者 机构地区：[1]Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China;[2]State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China高影响力机构 出　　处：《Chinese Science Bulletin》索引2007年第52卷第9期,共4页高影响力期刊 基　　金：Supported by the National Science Fund for Distinguished Young Scholars, China (Grant No. 50325209);the National Natural Science Foundation of China (Grant No. 50572005);the Major International Joint Research Program of China (Grant No. 50620120439). 摘　　要：Large-scale tetrapod-like ZnO nanostructures have been synthesized using a thermal chemical vapor deposition method on a silicon substrate. The high-purity nanotetrapods show sharp tips geometry with a wurtzite structure. The field emission properties of the uniform ZnO nanostructural material are investigated at different anode-cathode distances. The turn-on field for the ZnO nanotetrapods is found to be about 3.7 V/μm at a current density of 1 μA/cm2. The field emission behavior obeys Fowler-Nordheim relationship. More importantly,the field emission properties are improved after an-nealing in hydrogen,and therefore high emission current and low turn-on field are obtained. These results indicate that tetrapod-like ZnO nanostructures are a promising candidate for cold cathode emitters. 关 键 词：ZNO 纳米结构 氢气氛 热退火 场发射特性
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