Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Selective Dissolution of ZnO Crystal by a Two-step Thermal Aging in Aqueous Solution

수용액 합성법의 2단계 성장온도 변화를 통한 ZnO 결정의 선택적 용해 현상

  • Kim, Jeong-Seog (Department of Materials Science and Engineering, Hoseo University) ;
  • Chae, Ki-Woong (Department of BK21 Semiconductor & Display Engineering, Hoseo University)
  • 김정석 (호서대학교 신소재공학과) ;
  • 채기웅 (호서대학교 BK21 대학원 반도체디스플레이공학과)
  • Received : 2011.05.02
  • Accepted : 2011.07.01
  • Published : 2011.07.31
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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

References

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