Journal
APPLIED SURFACE SCIENCE
Volume 255, Issue 7, Pages 4050-4055Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2008.10.119
Keywords
Cobalt; Zinc oxide; Magnetic properties; Optical properties; Thermal stability
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Funding
- Postdoctoral Science Foundation of China [20070420952]
- Doctoral Foundation of Henan Polytechnic University, China [648185]
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Cobalt nanoparticles coated with zinc oxide can form composite spheres with core-shell structure. This coating process was based on the use of silane coupling with agent 3-mercaptopropyltrimethoxysilane (HS-(CH2)(3)Si(OCH3)(3), MPTS) as a primer to render the cobalt surface vitreophilic, thus it renders cobalt surface compatible with ZnO. X-ray photoelectron spectroscopy (XPS) was used to gain insight into the way in which the MPTS is bound to the surface of the cobalt nanoparticles. The morphological structure, chemical composition, optical properties and magnetic properties of the product were investigated by using transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), photoluminescence (PL) spectroscope and vibrating sample magnetometer (VSM). It was found that the Co/ ZnO core-shell structure nanocomposites exhibited both of favorable magnetism and photoluminescence properties. Results of the thermogravimetric analysis (TGA) and differential thermal analysis (DTA) indicated that the thermal stability of cobalt/zinc oxide was better than that of pure cobalt nanoparticles. (C) 2008 Elsevier B. V. All rights reserved.
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