期刊
APPLIED SURFACE SCIENCE
卷 411, 期 -, 页码 117-123出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2017.03.060
关键词
Field emission; Work function; ZnO nanotaper
类别
资金
- DAE
- NISER, HBNI
In this report, we demonstrate significantly enhanced field emission properties of ZnO nanotapers achieved via a corrugated decoration of Au. Field emission experiments on these Au-decorated ZnO nanotapers showed emission current densities comparable to the best results in the literature. Au decoration of 5 nm also reduced the effective turn-on field to similar to 0.54V/mu m, compared to the as grown ZnO nanotapers, which showed a turn-on field of similar to 1.1 V/mu m. Tunneling atomic force microscopy measurements revealed a very uniform spatial emission profile in the 5 nm Au decorated nanotapers, which is a basic requirement for any large scale application. We believe that metal induced mid-gap states formed at the ZnO-Au interface are responsible for the observed low turn-on field because such interface states are known to reduce the effective work function. A direct measurement of effective work function using Kelvin probe force microscopy indeed showed more than 1.1 eV drop in the case of 5 nm Au decorated ZnO nanotapers compared to the pristine nanotapers, supporting the above argument. (C) 2017 Elsevier B.V. All rights reserved.
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