The Effects of Substrate Orientation on Galvanic Growth of ZnO Structures

Abstract:

Electrochemical route has been a favorite technique for the fabrication of ZnO as it is relatively cheap and capable of producing abundance amount of materials. In this paper, we investigate the morphologies of hydrothermally synthesized ZnO structures assisted by galvanic process on conducting Au-coated silicon substrate. To induce the galvanic process, the substrate was in contact with aluminum so that the difference in the reduction potentials between the two materials provided the driving force for the formation of the ZnO structures. The galvanic process was found to promote compact and anisotropy growth of ZnO nanorods along the (001) plane. It was also found that substrate orientations in the electrolyte solution had an important bearing on the morphologies of ZnO. Well aligned periodic hexagonal arrays of ZnO nanorods of homogeneous diameters were obtained on gold-coated Si substrate with face-down orientation in the electrolyte solution.

• Periodical: Materials Science Forum (Volume 888)
• Pages: 304-308
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.888.304
• Online since: March 2017
• Authors: Kuan Ying Kok, Inn Khuan Ng, Nur Ubaidah Saidin, Thye-Foo Choo, Boon Siong Wee, Yusof Abdullah
• Keywords: Anisotropy Growth, Electrochemical, Galvanic Growth, Substrate Orientation, ZNO

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