Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Size Dependent Absorption Spectrum of ZnO Nanocrystals

  • Chang Ho Jung (Department of Electronic Engineering, Dankook University) ;
  • Wang Yongsheng (Institute of Optoelectronic Technology, Beijing Jiaotong University) ;
  • Suh Kwang-Jong (Department of Electrical and Electronic Engineering, Toyohashi University of Technology) ;
  • Son Chang-Sik (Department of Photonics, Silla University)
  • Published : 2005.07.01
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Abstract

To investigate the dependences of the absorption spectrum and electronic structure properties on the ZnO nano-particle size, ZnO nanocrystals were synthesized by a sol-gel method. The absorption onset peak exhibits a systematic blue-shift with decreasing particle size due to the quantum confinement effect, as well as, with decreasing $Zn^{2+}$ concentration. The increase of particle size is mainly controlled by coarsening and aggregation step during the nucleation and growth of ZnO nano-particles. The onset absorption spectrum of ZnO colloids changes from 310 to 355 nm as $Zn^{2+}$ concentration increases from 0.01 to 0.1 mole. The average particle size as a function of aging- time can be determined from the absorption spectra. The freshly prepared nanocrystal size was about 2.8nm.

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References

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