通过原位共沉淀法即 Co2+、Fe2+均匀共沉淀在氧化石墨表面的同时氧化石墨被原位热还原,制备出CoFe2O4-石墨烯(CFO-GN)纳米复合材料。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线能谱(EDS)、热重分析仪(TGA)、傅里叶变换红外光谱(FT-IR)和矢量网络分析仪(VNA)等对复合材料的形貌、结构、元素成分及微波吸收性能进行了表征和分析。结果表明：钴铁氧体(CoFe2O4)纳米粒子均匀分散在石墨烯层间及表面, CoFe2O4-石墨烯纳米复合材料同时具有介电损耗和磁损耗,表现出良好的微波吸收性能。CoFe2O4质量分数分别为88.62%和74.53%的 CoFe2O4-石墨烯纳米复合材料,当厚度为2 mm时反射损耗分别可达-11.0 dB 和-12.4 dB,反射损耗在-8 dB以下的频宽约为2.0 GHz和4.3 GHz。其中石墨烯含量相对较高的复合材料介电损耗较强,反射损耗强度较大,吸收频带较宽,具有更好的微波吸收性能。
CoFe2O4-graphene (CFO-GN) nanocomposites were synthesized by in situ co-precipitation method, in-volving homogeneous co-precipitation of Co2+and Fe2+on the surface of graphite oxides and in situ thermal reduc-tion of graphite oxides simultaneously. The morphology, structure, composition and microwave absorption proper-ties of the nanocomposites were characterized and analyzed by X-ray diffraction (XRD), scanning electron micro-scope (SEM), transmission electron microscope (TEM), X-ray energy dispersive spectroscope (EDS), thermogra-vimetric analyzer (TGA), Fourier transform infrared spectroscope (FT-IR) and vector network analyzer (VNA). The results indicate that the CoFe2O4 nanoparticles are uniformly dispersed on the interlayer and surface of the graphene sheets, CoFe2O4-graphene nanocomposites possess dielectric loss and magnetic loss, and exhibit excellent micro-wave absorption properties. The reflection losses of the nanocomposites with 88.62wt%and 74.53wt%CoFe2O4 are up to-11.0 dB and-12.4 dB, respectively, the bandwidths of reflection loss below-8 dB are 2.0 GHz and 4.3 GHz, respectively. The nanocomposites with higher content of graphene exhibit higher dielectric loss and reflection loss, wider absorption band, and thus exhibit better microwave absorption properties.
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