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Synthesis and field-emission properties of roselike ZnO nanostructures |
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| Authors: | L.L. Xu X.L. Wu X. Xiong J. Zhu H.T. Chen G.S. Huang P.K. Chu |
| Affiliation: | (1) National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, 210093, P.R. China;(2) Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong, P.R. China |
| Abstract: | Self-assembled roselike ZnO nanostructures were synthesized via thermal evaporation of zinc powders without catalytic assistance at the relatively low temperature of 550 °C. The roselike structures consist of a large number of ZnO nanorods that uniformly arrange into hexagonal multilayers. The spontaneous nanoindentation effects under geometric constraints can be used to explain the structures. The cathodoluminescence spectra show a wide visible emission band related to Zn interstitials and oxygen vacancies. Field emission measurements demonstrate that the roselike ZnO nanostructures possess good electron emission characteristics with a turn-on field of 4.3 V/μm. PACS 68.70.+w; 78.55.Cr; 81.05.Cy |
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