An efficient, controllable, and facile two-step synthetic strategy to prepare graphene-based nanocomposites is proposed. A series of Fe₃O₄-decorated reduced graphene oxide (Fe₃O₄@RGO) nanocomposites incorporating Fe₃O₄ nanocrystals of various sizes were prepared by an ethanothermal method using graphene oxide (GO) and monodisperse Fe₃O₄ nanocrystals with diameters ranging from 4 to 10 nm. The morphologies and microstructures of the as-prepared composites were characterized by X-ray diffraction, Raman spectroscopy, nitrogen adsorption measurements, and transmission electron microscopy. The results show that GO can be reduced to graphene during the ethanothermal process, and that the Fe₃O₄ nanocrystals are well dispersed on the graphene sheets generated in the process. The analysis of the electrochemical properties of the Fe₃O₄@RGO materials shows that nanocomposites prepared with Fe₃O₄ nanocrystals of different sizes exhibit different electrochemical performances. Among all samples, Fe₃O₄@RGO prepared with Fe₃O₄ nanocrystals of 6 nm diameter possessed the highest specific capacitance of 481 F/g at 1 A/g, highlighting the excellent capability of this material. This work illustrates a promising route to develop graphene-based nanocomposite materials with a wide range of potential applications.

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提出了一种高效，可控，简便的两步合成策略，以制备基于石墨烯的纳米复合材料。使用乙撑氧化石墨烯（GO）和单分散Fe ₃ O ₄通过乙炔热法制备了一系列掺入各种尺寸的Fe ₃ O ₄纳米晶的Fe ₃ O ₄修饰的还原氧化石墨烯（Fe ₃ O ₄ @RGO）纳米复合材料。直径范围从4到10 nm的纳米晶体。通过X射线衍射，拉曼光谱，氮吸附测量和透射电子显微镜对所制备复合材料的形貌和微观结构进行表征。结果表明，在乙醇热过程中，GO可以还原为石墨烯，并且Fe ₃ O ₄纳米晶体很好地分散在该过程中生成的石墨烯片上。Fe ₃ O ₄ @RGO材料的电化学性能分析表明，用不同尺寸的Fe ₃ O ₄纳米晶体制备的纳米复合材料表现出不同的电化学性能。在所有样品中，Fe ₃ O用直径为6 nm的Fe ₃ O ₄纳米晶体制备的₄ @RGO在1 A / g时具有481 F / g的最高比电容，突出了该材料的出色性能。这项工作说明了开发具有广泛潜在应用的石墨烯基纳米复合材料的有前途的途径。

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