Research Branch of Functional Materials, Institute of Microelectronic and Solid State Electronic, University of Electronic Science and Technology of China, Chengdu 610054, PR China.
J Colloid Interface Sci. 2011 Nov 1;363(1):98-104. doi: 10.1016/j.jcis.2011.07.004. Epub 2011 Jul 18.
Hybrids of Fe(3)O(4) nanoparticles and surface-modified graphene nanosheets (GNs) were synthesized by a two-step process. First, graphene nanosheets were modified by SOCl(2) and 4-aminophenoxyphthalonitrile to introduce nitrile groups on their surface. Second, the nitrile groups of surface-modified graphene nanosheets were reacted with ferric ions on the surface of Fe(3)O(4) with the help of relatively high boiling point solvent ethylene glycol to form a GNs/Fe(3)O(4) hybrid. The covalent attachment of Fe(3)O(4) nanoparticles on the graphene nanosheet surface was confirmed by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), energy-dispersive X-ray spectrometer (EDS) and scanning electron microscopy (SEM). TEM and HRTEM observations indicated that the sizes of the nanoparticles and their coverage density on GNs could be easily controlled by changing the concentration of the precursor and the weight ratio to GNs. Magnetic measurements showed that magnetization of the hybrid materials is strongly influenced by the reaction conditions. Chemically bonded by phthalocyanine, the solubility of as-synthesized GNs/Fe(3)O(4) hybrid materials was greatly enhanced, which was believed to have potential for applications in the fields of composites, wastewater treatment and biomaterials.
Fe(3)O(4) 纳米粒子和表面修饰的石墨烯纳米片（GNs）的杂化物通过两步法合成。首先，通过 SOCl(2) 和 4-氨基苯氧基邻苯二甲腈修饰石墨烯纳米片，在其表面引入腈基。其次，在相对较高沸点溶剂乙二醇的帮助下，表面修饰的石墨烯纳米片上的腈基与 Fe(3)O(4)表面的铁离子反应，形成 GNs/Fe(3)O(4)杂化物。傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）、能谱仪（EDS）和扫描电子显微镜（SEM）证实了 Fe(3)O(4)纳米粒子通过共价键连接到石墨烯纳米片表面。TEM 和 HRTEM 观察表明，通过改变前体的浓度和与 GNs 的重量比，可以轻松控制纳米粒子的尺寸及其在 GNs 上的覆盖密度。磁性测量表明，杂化材料的磁化强度受反应条件的强烈影响。通过酞菁键合，合成的 GNs/Fe(3)O(4)杂化材料的溶解度大大提高，这有望在复合材料、废水处理和生物材料等领域得到应用。
