Pulsed-discharge-aided laser ablation synthesis of nanoscale aluminum nitride powders |
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Authors: | P.N. Wang Q. Pan N.H. Cheung S.C. Chen |
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Affiliation: | (1) State Key Joint Lab for Materials Modification by Laser, Ion and Electron Beams, Fudan University, Department of Physics, Shanghai, China (Fax: 8621/6549-3232, E-mail: pnwang@fudan.an.cn), CN;(2) Hong Kong Baptist University, Department of Physics, 224 Waterloo Rd. Kowloon, Hong Kong (Fax: 852/2304-6558, E-mail: scchen@hkbu.edu.hk), CN |
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Abstract: | 2 ) discharges were shown to efficiently generate atomic nitrogen that promoted the synthesis of high-purity aluminum nitride powders formed by pulsed-laser ablation of aluminum targets. The interaction between the nitrogen discharge plasma and the ablated aluminum plume depended on the synchronisation of the two pulsed events for maximum overlap of the transient reactants. By monitoring the optical emissions of the reactive N+ species and analysing the synthesised powder with X-ray photoelectron spectroscopy, it was found that when laser ablation occurred at about 3 μs after the pulsed discharge, the N+ emission from the overlapping plasma was the most intense and the purity of the aluminum nitride synthesized was the highest. Received: 8 September 1997/Accepted: 8 September 1997 |
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Keywords: | PACS: 81.20.L 52.80 81.15.F |
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