Wang Qihua, Wang Dewei, Li Yuqi, Wang Tingmei
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, People's Republic of China.
J Nanosci Nanotechnol. 2012 Jun;12(6):4583-90. doi: 10.1166/jnn.2012.6189.
Superparamagnetic magnetite nanocrystals-graphene oxide (FGO) nanocomposites were successfully synthesized through a simple yet versatile one-step solution-processed approach at ambient conditions. Magnetite (Fe3O4) nanocrystals (NCs) with a size of 10-50 nm were uniformly deposited on the surfaces of graphene oxide (GO) sheets, which were confirmed by transmission electron microscopy (TEM) and high-angle annular dark field scanning transmission election microscopy (HAADF-STEM) studies. FGO with different Fe3O4 loadings could be controlled by simply manipulating the initial weight ratio of the precursors. The M-H measurements suggested that the as-prepared FGO nanocomposites have a large saturation magnetizations that made them can move regularly under an external magnetic field. Significantly, FGO nanocomposites also exhibit enhanced electric double-layer capacitor (EDLC) activity compared with pure Fe3O4 NCs and GO in terms of specific capacitance and high-rate charge-discharge.
通过一种简单通用的一步溶液处理方法，在环境条件下成功合成了超顺磁性磁铁矿纳米晶体 - 氧化石墨烯（FGO）纳米复合材料。尺寸为10 - 50 nm的磁铁矿（Fe3O4）纳米晶体（NCs）均匀沉积在氧化石墨烯（GO）片的表面，这通过透射电子显微镜（TEM）和高角度环形暗场扫描透射电子显微镜（HAADF - STEM）研究得以证实。通过简单地控制前驱体的初始重量比，可以控制具有不同Fe3O4负载量的FGO。M - H测量表明，所制备的FGO纳米复合材料具有较大的饱和磁化强度，这使得它们能够在外部磁场下规则移动。值得注意的是，就比电容和高倍率充放电而言，与纯Fe3O4 NCs和GO相比，FGO纳米复合材料还表现出增强的双电层电容器（EDLC）活性。
