화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.21, No.3, 733-738, May, 2004
DOI10.1007/BF02705513  Export Citation
Growth Mechanism of Needle-shaped ZnO Nanostructures over NiO-coated Si Substrates
Tae Yun Kim, Seung Hyun Lee, Young Hwan Mo, Kee Suk Nahm†, Ji Young Kim1, Eun Kyung Suh1, and Moon Kim2
  • Nano Materials Research Center and School of Chemical Engineering and Technology, Chonbuk National University, Chonju 561-756, Korea
  • 1Department of Semiconductor Science Technology, Chonbuk National University, Chonju 561-756, Korea
  • 2Department of Materials Science, University of North Texas, P.O. Box 305310, Denton, Texas 76203-5310, USA
E-mail:
ZnO nanostructures were synthesized over NiO-coated Si substrate by a thermal evaporation of Zn powders in a vertical chemical vapor deposition reactor. The ZnO nanostructures had a needle-like morphology and the diameter of the structures decreased linearly from the bottom to the top. The bottom diameters of the ZnO nano-needles normally ranged from 20-100 nm and the lengths were in the range of 2-3 μm. The clear lattice fringes in HRTEM image indicated the growth of good quality hexagonal single-crystal ZnO. Field emission characteristics of the ZnO nanoneedles showed that the turn-on field was about 8.87 V/μm with a field enhancement factor of about 1099. The growth mechanism of the ZnO nano-needles was proposed on the basis of experimental data.
Keywords:ZnO Nanostructures;Nano-needles;Evaporation of Zn;Characterization;Growth Mechanism
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