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http://dx.doi.org/10.4191/KCERS.2011.48.4.263

Selective Dissolution of ZnO Crystal by a Two-step Thermal Aging in Aqueous Solution  

Kim, Jeong-Seog (Department of Materials Science and Engineering, Hoseo University)
Chae, Ki-Woong (Department of BK21 Semiconductor & Display Engineering, Hoseo University)
Publication Information
Journal of the Korean Ceramic Society / v.48, no.4, 2011 , pp. 263-268 More about this Journal
Abstract
ZnO hexagonal rods grown in aqueous solution can be changed into a tubular shape by two-step aging in the course of the growing process. In the first step, hexagonal ZnO rods is grown by aging at $90^{\circ}C$ under a highly supersaturated aqueous solution giving rise to a fast precipitation rate. Meanwhile, during the second step aging at $60^{\circ}C$ in the same aqueous solution, the hexagonal polar face (001) having higher surface energy than (010) side planes dissolves to minimize surface energy. Hence the flat (001) face changes to a craterlike face and the hexagonal rod length of ZnO decreases at an initial-stage of this step aging. The formation of the (101) wedge-type faces is ascribed to the resultant of competitive reactions between the dissolution of polar face minimizing the surface energy which is a dominant reaction at the initial stage and the precipitation reaction dissipating supersaturation. At a later stage of the second-step the reaction rates of these two processes in the aqueous solution become similar and the overall reaction is terminated.
Keywords
ZnO; Tubular structure; Crystal growth; Aqueous solution;
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