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Field-emission properties of individual ZnO nanowires studied in situ by transmission electron microscopy

2007; IOP Publishing; Volume: 19; Issue: 17 Linguagem: Inglês

10.1088/0953-8984/19/17/176001

1361-648X

Yunhua Huang, Xuedong Bai, Yue Zhang, Junjie Qi, Yousong Gu, Qingliang Liao,

Nanowire Synthesis and Applications

The field-emission properties of individual zinc oxide (ZnO) nanowires, grown by a solid–vapour phase thermal evaporation process, were studied in situ by transmission electron microscopy (TEM) using a home-made piezo-manipulator. The results indicate that ZnO nanowires present an outstanding field-emission property with low turn-on voltage and high emission current; the proper linearity of 1/V–ln(I/V2) curves basically accords with the Fowler–Nordheim model, and the dependence of the field-enhancement factor β on the distance d between the nanowire tip and its counter anode fits a linear relationship. The investigations show that ZnO nanowires show promise for potential applications as field emitters.