US EPA

1570784 

Journal Article 

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

Uekawa, N; Yamazaki, A; Ishii, S; Kojima, T; Kakegawa, K 

2010 

Yes 

Ceramic Society of Japan. Journal
ISSN: 1882-0743 

118 

1374 

96-101 

10.2109/jcersj2.118.96 

WOS:000275022300005 

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)center dot 6H(2)O) 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. (C) 2010 The Ceramic Society of Japan. All rights reserved. 

Zinc oxide; Nanoparticle; Sol; Photoluminescence