Zhang Long, Huang Yi, Zhang Yi, Ma Yanfeng, Chen Yongsheng
Key Laboratory of Functional Polymer Materials, Center for Nanoscale Science and Technology, Institute of Polymer Chemistry College of Chemistry, Nankai University, Tianjin 300071, China.
J Nanosci Nanotechnol. 2013 Feb;13(2):1129-31. doi: 10.1166/jnn.2013.6000.
Here we describe a versatile new strategy for producing graphene/cobalt magnetic nanocomposites by combining the sol-gel method and autocombustion. We used graphene oxide (GO), cobalt nitrate and citric acid as starting materials and prepared a dry gel of them through a routine sol-gel approach. After the autocombustion was activated at 300 degrees C in a tube furnace under an argon atmosphere, reducing agents such as H2 and CH4 were produced and then in situ reduced GO and cobalt nitrate to get graphene/cobalt magnetic nanocomposites. X-ray photoelectron spectroscopic and X-ray powder diffraction analysis showed that the nanoparticles loaded on graphene are cobalt but not cobalt oxide. Transmission electron microscopy and scanning electron microscopy revealed that cobalt nanoparticles, with an average diameter of -10 nm, were homogeniously deposited on the surface of graphene. Further more, other metal nanoparticles such as Ni, Cu, Ag and Bi can also be loaded on graphene using the same method.
在此，我们描述了一种通过溶胶 - 凝胶法与自燃烧相结合来制备石墨烯/钴磁性纳米复合材料的通用新策略。我们使用氧化石墨烯（GO）、硝酸钴和柠檬酸作为起始原料，并通过常规的溶胶 - 凝胶方法制备了它们的干凝胶。在氩气气氛下于管式炉中300℃激活自燃烧后，产生了诸如H₂和CH₄等还原剂，然后将GO和硝酸钴原位还原以获得石墨烯/钴磁性纳米复合材料。X射线光电子能谱和X射线粉末衍射分析表明，负载在石墨烯上的纳米颗粒是钴而非氧化钴。透射电子显微镜和扫描电子显微镜显示，平均直径约为10nm的钴纳米颗粒均匀地沉积在石墨烯表面。此外，其他金属纳米颗粒如Ni、Cu、Ag和Bi也可以使用相同的方法负载在石墨烯上。
