Existing Form of Zinc Oxide and Phase Transformation for Zinc Oxide Encapsulated in Mesoporous Silica

doi:10.1016/j.jmst.2013.06.007

J. Mater. Sci. Technol.

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Existing Form of Zinc Oxide and Phase Transformation for Zinc Oxide Encapsulated in Mesoporous Silica

Qingshan Lu¹⁾, Guohong Yun^1,2), Wenping Zhou¹⁾, Jiangong Li³⁾

1) Inner Mongolia Key Laboratory of Nanomagnetic and Functional Materials and College of Physical Science and Technology, Inner Mongolia University, Hohhot 010021, China
2) College of Physics and Electronic Information, Inner Mongolia Normal University, Hohhot 010022, China
3) Institute of Materials Science and Engineering, Lanzhou University, Lanzhou 730000, China

Received:2012-02-22 Revised:2012-10-18 Online:2013-09-30 Published:2013-08-22
Contact: Qingshan Lu
Supported by:
National Natural Science Foundation of China under Grant No. 51202103, the China Postdoctoral Science Foundation under Grant No. 2012M510789, the Natural Science Foundation of Inner Mongolia Autonomous Region under Grant No. 2011BS0804, and the Program of Higher-level Talents of Inner Mongolia University under Grant No. Z20100123.

Abstract

Abstract:

Nanocomposites of ZnO encapsulated in mesoporous silica were prepared by wetness impregnation and calcination. The samples were characterized by X-ray diffraction, transmission electron microscopy, nitrogen adsorption–desorption isotherms, and X-ray photoelectron spectroscopy. The effects of ZnO content and thermal treatment on the existing form of ZnO as well as phase transformation were investigated. ZnO exists stably in the form of non-crystalline phase or cluster when crystallite size is small. With increasing ZnO content, as the size of ZnO reaches a critical size of crystalline phase, the non-crystalline ZnO or cluster transforms structurally to crystalline ZnO with low energy state. Besides, Zn₂SiO₄ was obtained by solid-state reaction between ZnO and mesoporous silica. The mesoporous silica acts as not only a reactant but also a diffusion barrier which inhibits the phase transformation from β-Zn₂SiO₄ to α-Zn₂SiO₄. The formation temperature of Zn₂SiO₄ is lower than that of conventional solid-state reaction because of the unique structure of mesoporous silica.

Key words: Zinc oxide, Mesoporous silica, Solid-state reaction, Composites, Zinc silicate

Qingshan Lu, Guohong Yun, Wenping Zhou, Jiangong Li. Existing Form of Zinc Oxide and Phase Transformation for Zinc Oxide Encapsulated in Mesoporous Silica[J]. J. Mater. Sci. Technol., DOI: 10.1016/j.jmst.2013.06.007.

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Existing Form of Zinc Oxide and Phase Transformation for Zinc Oxide Encapsulated in Mesoporous Silica

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