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Microwave-hydrothermal synthesis and photoluminescence characteristics of zinc oxide powders

Published online by Cambridge University Press:  03 March 2011

Chung-Hsin Lu ,
Wen-Jeng Hwang  and
S.V. Godbole
Chung-Hsin Lu*
Affiliation:
Electronic and Electro-optical Ceramics Lab, Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan 106, Republic of China
Wen-Jeng Hwang
Affiliation:
Electronic and Electro-optical Ceramics Lab, Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan 106, Republic of China
S.V. Godbole
Affiliation:
Electronic and Electro-optical Ceramics Lab, Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan 106, Republic of China
*
a) Address all correspondence to this author.e-mail: chlu@ntu.edu.tw
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Abstract

A microwave-hydrothermal process for the synthesis of crystalline zinc oxide powders has been developed in this study. Well-crystallized zinc oxide powders exhibiting different morphology, crystallinity, and particle size have been successfully prepared by controlling the process temperature and molarity of NH4OH in the starting solution. With increasing process temperature and NH4OH molarity during synthesis, the morphology of ZnO powders changes from flowerlike agglomeration to a well-developed rodlike shape. The band gap of ZnO powders increases with a decrease in the molarity of NH4OH during synthesis. Vacuum ultraviolet radiation (VUV) excited luminescence studies for ZnO powders reveal an excitation band at 161 nm possibly due to the absorption of O2− 2p electrons in the valence band. The VUV excitation band of ZnO powders observed at 161 nm will be useful for excitation of gas-discharged plasma display devices.

Keywords

CeramicHydrothermalMicrowave heating
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 2 , February 2005 , pp. 464 - 471
Copyright
Copyright © Materials Research Society 2005

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