CoFe2O4-石墨烯纳米复合材料的制备及微波吸收性能

doi:10.15541/jim20130588

摘要/Abstract

摘要：

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。

关键词: 石墨烯, 钴铁氧体, 纳米复合材料, 微波吸收

Abstract:

CoFe₂O₄-graphene (CFO-GN) nanocomposites were synthesized by in situ co-precipitation method, involving homogeneous co-precipitation of Co²⁺and Fe²⁺ on the surface of graphite oxides and in situ thermal reduction of graphite oxides simultaneously. The morphology, structure, composition and microwave absorption properties of the nanocomposites were characterized and analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray energy dispersive spectroscope (EDS), thermogravimetric 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 microwave 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.

Key words: graphene, cobalt ferrite, nanocomposite, microwave absorption

中图分类号:

TB332
TM25

吴小雨, 李松梅, 刘建华, 于美, 王博. CoFe₂O₄-石墨烯纳米复合材料的制备及微波吸收性能[J]. 无机材料学报, 2014, 29(8): 845-850.

WU Xiao-Yu, LI Song-Mei,LIU Jian-Hua, YU Mei, WANG Bo. Preparation and Microwave Absorption Properties of CoFe₂O₄-graphene Nanocomposites[J]. Journal of Inorganic Materials, 2014, 29(8): 845-850.

图/表 6

图1 氧化石墨和CoFe2O4-石墨烯纳米复合材料的XRD图谱

Fig. 1 XRD patterns of the GO and the CoFe2O4-graphene nanocomposites (a)GO; (b) CFO-GN-1; (c) CFO-GN-2

图2 CoFe2O4-石墨烯纳米复合材料的SEM和TEM照片

Fig. 2 SEM (a, b) and TEM (c, d) images of the CoFe2O4- graphene nanocomposites (a, c) CFO-GN-1; (b, d) CFO-GN-2; Inset in (d) is the corresponding HRTEM image of CFO-GN-2

图 3 CoFe2O4-石墨烯纳米复合材料的X射线能谱图和热重曲线

Fig. 3 (a) EDS spectrum and (b) TGA curves of the CoFe2O4-graphene nanocomposites

图 4 氧化石墨和CoFe2O4-石墨烯纳米复合材料的红外谱图

Fig. 4 FT-IR spectra of the GO and the CoFe2O4-graphene nanocomposites (a) GO; (b) CFO-GN-1; (c) CFO-GN-2

图 5 CoFe2O4-石墨烯纳米复合材料的介电损耗角正切和磁损耗角正切与频率关系曲线

Fig. 5 Relation curves of dielectric and magnetic loss tangent vs frequency of the CoFe2O4-graphene nanocomposites (a) Dielectric loss tangent ; (b) Magnetic loss tangent

Fig. 6 Reflection loss vs frequence curves for the CoFe2O4- graphene nanocomposites with different thicknesses

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CoFe₂O₄-石墨烯纳米复合材料的制备及微波吸收性能

Preparation and Microwave Absorption Properties of CoFe₂O₄-graphene Nanocomposites

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