氧化石墨烯及其氧化铁复合物的原位合成

开发了在富氧Fe(acac),络合物体系中膨化氧化石墨制取氧化石墨烯/Fe2O3复合物的一步法.应用FT-IR、XRD、VSM、AFM及低温直流电导测量法对所制氧化石墨/Fe2O3复合物进行表征.FT-IR研究结果显示:膨化后,氧化石墨的环氧基团分解,同时形成了氧化铁粒子与氧化石墨烯复合物.AFM测试表明:在较高Fe2O3含量下,氧化石墨烯片层结构剥蚀形成厚达5 mm氧化石墨烯叠层.VSM研究显示:在室温和0.13 emu/g～5.5 emu/g范围内,全部复合物呈铁磁特性.这些复合物的导电性受控于准电子跃迁机制.

In situ synthesis of graphene oxide and its composites with iron oxide

A single step method was developed for the preparation of graphene oxide/Fe2O3 composites by exfoliation of graphite oxide with an oxygen-rich ferric acetyl acetonate complex. The synthesized materials were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, vibrating sample magnetometry, atomic force microscopy, and low temperature de conductivity measurements. After exfoliation, the Fourier transform infrared studies reveal the decomposition of epoxy groups and the simultaneous formation of composites of iron oxide particles within the graphene oxide. Atomic force microscopy reveals the formation of an～5nm thick graphene oxide stack with layered morphology. The layered morphology of graphene oxide degrades at higher concentrations of iron oxide. The vibrating sample magne-tometer studies show ferromagnetic behavior of all composites in the range of 0.13-5.5emu/g at room temperature. The conductivity of these composites is found to be governed by a quasi 1D hopping mechanism.