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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.118  No.1374 (February) (2010)  >  pp.96-101

Journal of the Ceramic Society of Japan
<<Previous article Vol.118  No.1374 (February) (2010)   pp.96 - 101 Next article>>

Synthesis of a stable sol of ZnO nanoparticles by low-temperature heating of Zn(OH)2 in ethylene glycol containing Zn2+ ions

Naofumi UEKAWA1), Akinori YAMAZAKI1), Shunsuke ISHII1), Takashi KOJIMA1) and Kazuyuki KAKEGAWA1)
1) Graduate School of Engineering, Chiba University

  Stable sols with a homogeneous dispersion of ZnO nanoparticles were prepared by heating zinc hydroxide (Zn(OH)2) precipitate in an ethylene glycol solution of zinc nitrate hexahydrate (Zn(NO3)2·6H2O) at 308 K. The formation of ZnO nanoparticles occurred within 1 h when the mixed solution of Zn(OH)2 precipitate and 0.05 mol/L of the ethylene glycol solution of zinc nitrate hydrate was heated at 308 K. The obtained sol was homogeneous, and no aggregation of the ZnO nanoparticles was observed. The formation process of ZnO nanoparticles in the mixed solution of Zn(OH)2 and the 0.05 mol/L ethylene glycol solution of zinc nitrate hexahydrate was examined by measuring changes in the UV-VIS spectra of the obtained sol and the XRD patterns of the particles separated from the sol. Strong absorption due to the electron transition between the band gap of ZnO appeared during heating at 308 K for 1 h. When the heating time decreased, the shift in the absorption edge to a shorter wavelength was observed. This shift in the absorption edge would be related to changes in the particle size during the formation process of ZnO nanoparticles. Furthermore, the photoluminescence spectra of the obtained ZnO nanoparticles were examined. The intensity of photoluminescence increased with increases in the concentrations of zinc nitrate hydrate in the ethylene glycol solution.


Keyword:
Zinc oxide, Nanoparticle, Sol, Photoluminescence

Received: June 15, 2009
Accepted: November 19, 2009 , Published online: February 01, 2010
Copyright (c) 2010 The Ceramic Society of Japan

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