標題: Nanotip fabrication of zinc oxide nanorods and their enhanced field emission properties
作者: Yao, I-Chuan
Lin, Pang
Tseng, Tseung-Yuen
材料科學與工程學系
電子工程學系及電子研究所
Department of Materials Science and Engineering
Department of Electronics Engineering and Institute of Electronics
公開日期: 25-Mar-2009
摘要: The ZnO nanorods on ZnO/Si substrates were synthesized by using the low temperature growth aqueous solution method. The chemical and plasma etching treatments were carried out on the as-grown ZnO nanorods to provide the nanorods with various tip angles. The crystal structure and morphology of the ZnO nanorods were examined by x-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively. The nanorods grew along the [ 0001] direction and had various tip angles formed after the above etching processes. The field emission properties of the ZnO nanorods with tip angles of 110 degrees and 85 degrees are: the turn-on electric fields (at the current density of 10 mu A cm(-2)) are about 3.03 and 1.70 V mu m(-1), respectively, while field enhancement factors are 1972 and 3513, respectively. The lifetime measurement result indicates the turn-on field of the ZnO nanostructures reaches a stable value during 1000 cycle times. The enhanced field emission properties are believed to benefit from decreased tip angle of the nanorod emitter.
URI: http://dx.doi.org/10.1088/0957-4484/20/12/125202
http://hdl.handle.net/11536/7464
ISSN: 0957-4484
DOI: 10.1088/0957-4484/20/12/125202
期刊: NANOTECHNOLOGY
Volume: 20
Issue: 12
結束頁: 
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