Synthesis and Magnetic Properties of Mesostructured -Fe2O3/Carbon Composites by a Co-casting Method
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- 作者：Xiaoping Dong ; Hangrong Chen ; Wenru Zhao ; Xia Li ; Jianlin Shi
- 刊名：Chemistry of Materials
- 出版年：2007
- 出版时间：July 10, 2007
- 年：2007
- 卷：19
- 期：14
- 页码：3484 - 3490
- 全文大小：532K
- 年卷期：v.19,no.14(July 10, 2007)
- ISSN：1520-5002
文摘
A new co-casting method has been developed to synthesize novel mesostructured 
-Fe2O3/C compositeswith -Fe2O3 nanoparticles embedded in the wall of ordered mesoporous carbon materials. Fe3+ ionswere captured by the framework of polyfurfuryl alcohol in the channel of mesoporous silica; during thecarbonization process, FeCl3·6H2O was decomposed and magnetic -Fe2O3 nanoparticles were formedand confined in the carbon framework. The -Fe2O3/C composite materials were characterized usingX-ray diffraction (XRD), nitrogen sorption, Mössbauer spectroscopy, X-ray photoelectron spectroscopy(XPS), transmission electron microscopy (TEM), and energy-dispersive X-ray (EDX) spectroscopytechniques; the magnetization strength was measured on a vibrating-sample magnetometer (VSM). Differentamounts of magnetic iron oxides could be introduced into the composites, which led to varied specificsaturation magnetizations. Near-zero coercivity and remanance indicate the superparamagnetic behaviorof the composites.
-Fe2O3/C compositeswith -Fe2O3 nanoparticles embedded in the wall of ordered mesoporous carbon materials. Fe3+ ionswere captured by the framework of polyfurfuryl alcohol in the channel of mesoporous silica; during thecarbonization process, FeCl3·6H2O was decomposed and magnetic -Fe2O3 nanoparticles were formedand confined in the carbon framework. The -Fe2O3/C composite materials were characterized usingX-ray diffraction (XRD), nitrogen sorption, Mössbauer spectroscopy, X-ray photoelectron spectroscopy(XPS), transmission electron microscopy (TEM), and energy-dispersive X-ray (EDX) spectroscopytechniques; the magnetization strength was measured on a vibrating-sample magnetometer (VSM). Differentamounts of magnetic iron oxides could be introduced into the composites, which led to varied specificsaturation magnetizations. Near-zero coercivity and remanance indicate the superparamagnetic behaviorof the composites.