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Investigation of Nucleation Mechanism and Tapering Observed in ZnO Nanowire Growth by Carbothermal Reduction Technique

Kar, Ayan and Low, Ke-Bin and Oye, Michael and Stroscio, Michael A and Dutta, Mitra and Nicholls, Alan and Meyyappan, M (2011) Investigation of Nucleation Mechanism and Tapering Observed in ZnO Nanowire Growth by Carbothermal Reduction Technique. Nanoscale Research Letters, 6 (1). pp. 1-9.

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Official URL: http://www.springerlink.com/content/343xj744824266...

Abstract

ZnO nanowire nucleation mechanism and initial stages of nanowire growth using the carbothermal reduction technique are studied confirming the involvement of the catalyst at the tip in the growth process. Role of the Au catalyst is further confirmed when the tapering observed in the nanowires can be explained by the change in the shape of the catalyst causing a variation of the contact area at the liquid-solid interface of the nanowires. The rate of decrease in nanowire diameter with length on the average is found to be 0.36 nm/s and this rate is larger near the base. Variation in the ZnO nanowire diameter with length is further explained on the basis of the rate at which Zn atoms are supplied as well as the droplet stability at the high flow rates and temperature. Further, saw-tooth faceting is noticed in tapered nanowires, and the formation is analyzed crystallographically.

Item Type:Article
Subjects:Physical Science > Nano objects
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Electronics and Computer Science
ID Code:10983
Deposited By:JNCASR
Deposited On:10 May 2011 11:46
Last Modified:10 May 2011 11:46

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