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Journal of Dispersion Science and Technology Volume 32, 2011 - Issue 4
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Original Articles

Preparation of Ag@SiO2 Dispersion in Different Solvents and Investigation of its Optical Properties

Rui Wanga Institute of Hybrid Materials, Qingdao University , Qingdao, P. R. China;b Laboratory of New Fiber Materials and Modern Textile-the Growing Base for State Key Laboratory, Qingdao University , Qingdao, P. R. China;c Department of Materials Science and Engineering, College of Chemistry, Chemical and Environmental Engineering, Qingdao University , Qingdao, P. R. China
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Jianguo Tanga Institute of Hybrid Materials, Qingdao University , Qingdao, P. R. China;b Laboratory of New Fiber Materials and Modern Textile-the Growing Base for State Key Laboratory, Qingdao University , Qingdao, P. R. China;c Department of Materials Science and Engineering, College of Chemistry, Chemical and Environmental Engineering, Qingdao University , Qingdao, P. R. China
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Jixian Liua Institute of Hybrid Materials, Qingdao University , Qingdao, P. R. China;b Laboratory of New Fiber Materials and Modern Textile-the Growing Base for State Key Laboratory, Qingdao University , Qingdao, P. R. China;c Department of Materials Science and Engineering, College of Chemistry, Chemical and Environmental Engineering, Qingdao University , Qingdao, P. R. China
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Yao Wanga Institute of Hybrid Materials, Qingdao University , Qingdao, P. R. China;b Laboratory of New Fiber Materials and Modern Textile-the Growing Base for State Key Laboratory, Qingdao University , Qingdao, P. R. China;c Department of Materials Science and Engineering, College of Chemistry, Chemical and Environmental Engineering, Qingdao University , Qingdao, P. R. China
&
Zhen Huanga Institute of Hybrid Materials, Qingdao University , Qingdao, P. R. China;b Laboratory of New Fiber Materials and Modern Textile-the Growing Base for State Key Laboratory, Qingdao University , Qingdao, P. R. China;c Department of Materials Science and Engineering, College of Chemistry, Chemical and Environmental Engineering, Qingdao University , Qingdao, P. R. China
Pages 532-537 | Received 27 Dec 2009, Accepted 17 Jan 2010, Published online: 24 Mar 2011
 
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Abstract

In this article, Ag-SiO2 composite nanoparticles with a core-shell structure were prepared by a very simple and rapid wet chemical method in different solvents such as methanol, ethanol and isopropanol, respectively, transmittance electron microscopy (TEM) images show that regular SiO2-covered silver nanoparticles (briefly-marked as Ag@SiO2) can be obtained in ethanol and isopropanol, but not in methanol. The x-ray diffraction (XRD) measurement indicates that the silver nanoparticles are face-centered cubic (fcc) structure with high crystallinity. X-ray photoelectron spectroscopy (XPS) measurement shows that the binding energy of O1 s in Si-O-Ag is lower than that in Si-O-Si, which means that the complex bonding is established between Ag core and SiO2 shell. Ultraviolet-visible (UV-vis) spectroscopy records that the plasmon resonance peak of silver nanoparticles is shifted after the coverage of SiO2. As capping effect, the fluorescence intensity related to surface plasmon resonance (SPR) of Ag core is reduced by SiO2 shell.

Acknowledgements

This research was financially supported by National Program on Key Basic Research pre-Projects (pre973) through contract grant number 2004CCA04800, and the Natural Foundation of Shandong Province (2009–2011).

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