Size Dependent Absorption Spectrum of ZnO Nanocrystals

Ho Jung Chang; Yongsheng Wang; Kwang-Jong Suh; Chang-Sik Son

Korean Journal of Materials Research, Vol.15, No.7, 431-434, July, 2005

DOI10.3740/MRSK.2005.15.7.431 Export Citation

Size Dependent Absorption Spectrum of ZnO Nanocrystals

Ho Jung Chang, Yongsheng Wang¹, Kwang-Jong Suh², and Chang-Sik Son^{3, †}

Department of Electronic Engineering, Dankook University, Chungnam 330-714, Korea
¹Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China, Korea
²Department of Electrical and Electronic Engineering, Toyohashi University of Technology, Toyohashi 441-8580, Japan, Korea
³Department of Photonics, Silla University, Busan 617-736, Korea

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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 [Math Processing Error] 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 [Math Processing Error] 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.

Keywords:ZnO;nanocrystals;absorption spectrum;quantum confinement effect

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[5] Tang ZK, Wong GKL, Yu P, Kawasaki M, Ohtomo A, Koinuma H, Appl. Phys. Lett., 72, 3270 (1998)

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