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Field emission enhancement of ZnO nanorods assisted by decoration of ZnO nanoparticles

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4 Author(s)
Huang, Xin Xiong ; Department of Physics, National Taiwan University, Taipei, 106 Taiwan, Republic of China ; Cheng, Chung Liang ; Chen, Yung Ting ; Chen, Yang Fang

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A simple approach for field emission enhancement, based on the decoration of nanoparticles on the surface of nanostructures, is reported. To illustrate our working principle, we demonstrate that the field emission performance of ZnO nanorods can be greatly enhanced by decorating ZnO nanoparticles. It is found that the field enhancement factor β can be enhanced from 1488 to 3485 and the turn-on electric field (the electric field at which the current density reaches 10 μA/cm2) can be reduced from 4.98 to 1.84 Vm. The underlying mechanisms were attributed to the combined effects of both surface passivation and electric potential gradient generated by nanoparticles. Our approach shown here should be very useful for the development of highly efficient field emitters.

Published in:

Journal of Applied Physics  (Volume:108 ,  Issue: 6 )

Date of Publication:

Sep 2010

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