Synthesis of 3D Hierarchical Fe3O4/Graphene Composites with High Lithium Storage Capacity and for Controlled Drug Delivery

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• 作者：Xiyan Li ; Xiaolei Huang ; Dapeng Liu ; Xiao Wang ; Shuyan Song ; Liang Zhou ; Hongjie Zhang
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：November 10, 2011
• 年：2011
• 卷：115
• 期：44
• 页码：21567-21573
• 全文大小：1027K
• 年卷期：v.115,no.44(November 10, 2011)
• ISSN：1932-7455

文摘

Three-dimensional (3D) hierarchical Fe₃O₄/graphene nanosheet (GNS) composites have been synthesized using a simple in situ hydrothermal method. Characterization shows that the Fe₃O₄ nanoflowers are highly encapsulated in a GNS matrix. The Fe₃O₄/GNSs-1 nanocomposite (60 wt % of Fe₃O₄ in the composites) exhibits a stable capacity of 605 mAh g^鈥? with no noticeable fading for up to 50 cycles in the voltage range of 0.001鈥?.0 V, and the superior performance of Fe₃O₄/GNSs-1 is clearly established by comparison of the results with those from Fe₃O₄/GNSs-2 (23 wt % of Fe₃O₄ in the composites) and bare Fe₃O₄. In addition, another possible application of the drug delivery with the composites shows that the loading of rhodamine B (RB) on Fe₃O₄/GNSs increased linearly with the increase in the initial RB concentration, and the loading capacity of Fe₃O₄/GNSs-1 was as high as 3.18 mg mg^鈥?. The excellent electrochemical performance of the composites and highly efficient loading of RB could be attributed to the enhanced electronic conductivity and the large surface areas of the Fe₃O₄/GNSs in which the hierarchical structure of Fe₃O₄ nanoflowers are highly encapsulated in the GNS matrix.