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Vol. 26 No. 5 (2014): Vol 26 Issue 5

Copyright (c) 2014 AJC

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Synthesis and Optical Property of ZnO/SiO2 Nanocomposite Cryogels

https://doi.org/10.14233/ajchem.2014.17201
Lifen Su
Anhui Province Key Laboratory of Environment-Friendly Polymer Materials, College of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P.R. China
Lei Miao
Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, P.R. China
Ming Zhang
Department of Physics, Graduate School of Engineering, Yokohama National University, Yokohama 240-8501, Japan
Jiasheng Qian
Anhui Province Key Laboratory of Environment-Friendly Polymer Materials, College of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P.R. China
Ru Xia
Anhui Province Key Laboratory of Environment-Friendly Polymer Materials, College of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P.R. China
Bin Yang
Anhui Province Key Laboratory of Environment-Friendly Polymer Materials, College of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P.R. China
Peng Chen
Anhui Province Key Laboratory of Environment-Friendly Polymer Materials, College of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, P.R. China

Corresponding Author(s) : Lei Miao

maiolei@ms.giec.ac.cn; ausulf@sina.com;

Asian Journal of Chemistry, Vol. 26 No. 5 (2014): Vol 26 Issue 5

Abstract

In this paper, ZnO cryogels with a dopant of SiO2 with molar ratio of 9:1 to 1:1 were prepared by sol-gel technology and dried by a novel vacuum freeze drying using a co-precursor method. The as-prepared ZnO/SiO2 nanocomposites were annealed in air at 250, 500 and 800 ºC for 45 min, respectively. The structure and morphology of the nanocomposites were determined by X-ray diffraction (XRD) and field emission scanning electron microscopy. The optical properties were estimated not only by UV-visible spectrometer but also theoretical calculation. The annealed nanocomposites exhibited hexagonal Wurtzite structure ZnO and whose crystallinity became better as an increase of annealing temperature. The amounts of doping SiO2 affect the optical band gaps and morphology of ZnO/SiO2 nanocomposites significantly. After annealing, the obtained ZnO nanorods grow up in size from the SEM images with annealing temperature ranging from 250 to 500 ºC and flowerlike ZnO was formed with tetragonal pillars at 800 ºC.

Keywords

Optical band gap ZnO/SiO2 nanocomposites Cryogels Co-precursor method
Su, L., Miao, L., Zhang, M., Qian, J., Xia, R., Yang, B., & Chen, P. (2014). Synthesis and Optical Property of ZnO/SiO2 Nanocomposite Cryogels. Asian Journal of Chemistry, 26(5), 1257–1260. https://doi.org/10.14233/ajchem.2014.17201
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