Reshaping the tips of ZnO nanowires by pulsed laser irradiation |
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| Authors: | Xue Wang Yong Ding Dajun Yuan Jung-Il Hong Yan Liu C P Wong Chenguo Hu Zhong Lin Wang |
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| Affiliation: | (1) Department of Electrical and Computer Engineering, Fitzpatrick Institute for Photonics, Duke University, Durham, North Carolina 27708, USA;(2) Department of Chemistry, French Family Science Center, Duke University, Durham, North Carolina 27708, USA;(3) School of Science, Jimei University, Xiamen, 361021, China;(4) U.S. Army Aviation and Missile Research, Development, and Engineering Center, Weapons Sciences Directorate, Redstone Arsenal, AL 35898, USA;(5) Department of Physics, Duke University, Durham, NC 27708, USA |
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| Abstract: | Vertically aligned ZnO nanowires have been synthesized by a hydrothermal method. After being irradiated by a short laser pulse, the tips of the as-synthesized ZnO nanowires can be tailored into a spherical shape. Transmission electron microscopy revealed that the spherical tip is a single-crystalline piece connected to the body of the ZnO nanowire, and that the center of the sphere is hollow. The growth mechanism of the hollow ZnO nanospheres is proposed to involve laser-induced ZnO evaporation immediately followed by re-nucleation in a temperature gradient environment. The laser-irradiated ZnO nanowire array shows hydrophobic properties while the original ZnO nanowire array shows hydrophilicity. The as-grown ZnO nanowire arrays with hollow spherical tips can serve as templates to grow ZnO nanowire arrays with very fine tips, which may be a good candidate material for use in field emission and scanning probe microscopy.  |
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