Effect of Co-doping on the microstructure and microwave absorbing properties of RGO/Fe3O4 composites
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摘要: 研究了Co摻雜對還原氧化石墨烯(RGO)/Fe3O4復合材料結構、形貌和吸波性能的影響規律.采用一步水熱法分別制備RGO/Fe3O4和Co摻雜的RGO/Fe3O4復合材料,通過掃描電子顯微鏡、X射線衍射儀和X射線光電子能譜分析Co摻雜對復合材料的微觀形貌、相組成及表面元素價態的影響;利用矢量網絡分析儀測定兩種復合材料在2~18 GHz頻率范圍內的相對復介電常數和復磁導率,模擬計算了Co摻雜對RGO/Fe3O4復合吸波性能的影響規律.結果表明:部分Co參與了水熱反應生成了CoCO3、Co3O4和Co2O3,還有部分Co以單質形式存在,其通過正負電荷吸引機制,影響Fe3+在氧化石墨烯(GO)表面的配位,使得負載在還原氧化石墨烯(RGO)表面的Fe3O4納米顆粒部分遷移至RGO片層間;Co摻雜改善了復合材料的導電能力和磁損耗能力,使復合材料的吸波能力顯著增強.反射率模擬結果表明:摻雜后與摻雜前相比,當匹配厚度d=2.00 mm時,最大反射損耗提高3.44 dB,有效吸收頻帶拓寬2.88 GHz;當匹配厚度d=2.50 mm時,最大反射損耗提高8.45 dB,有效吸收頻帶拓寬2.73 GHz.Co摻雜對RGO/Fe3O4復合材料的結構和形貌有顯著影響,并有效改善復合材料的吸波性能.
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關鍵詞:
- 還原氧化石墨烯(RGO) /
- 四氧化三鐵 /
- Co摻雜 /
- 復合材料 /
- 吸波性能
Abstract: With the rapid development of precision guidance and radar detection technologies, radar absorbing materials have gained popularity. Traditional radar absorbing materials are limited because of a high density and narrow absorption band. To improve the absorption properties of traditional radar absorbing materials, developing radar absorbing material with thin-layer, light-weight, broadband and strong-absorbing is necessary. The effects of Co-doping on the structure, morphology, and microwave absorption properties of reduced graphene oxide (RGO)/Fe3O4 composites were studied in this paper. The RGO/Fe3O4 and Co-doped RGO/FeFe3O4 composites were prepared via a one-step hydrothermal method. The effects of Co on the microstructure, phase composition, and valence state of the composite were analyzed using scanning electron microscopy, X-ray diffractometry, and X-ray photoelectron spectroscopy. The relative complex permittivity and permeability of RGO/Fe3O4 and Co-doped RGO/Fe3O4 composites were within 2-18 GHz, as recorded by a vector network analyzer. The influence of Co-doping on the microwave absorption property of RGO/Fe3O4 was simulated. The results show that a part of Co participates in the hydrothermal reaction to form CoCO3, Co3O4, and Co2O3, whereas some Co exists in a simple form, and the Fe3+ coordination on the graphene oxide (GO) surface is affected through the positive and negative charge attraction mechanism, inducing Fe3O4 adhesion on the graphene surface. Co-doping improves the composites' electrical conductivity and magnetic loss ability thereby significantly enhancing their wave absorption property. Compared with RGO/Fe3O4, the maximum reflection loss of Co-doped RGO/Fe3O4 composites increases by 3.44 dB, and the effective absorption bandwidth of Co-doped RGO/Fe3O4 is broadened by 2.88 GHz when the matching thickness is 2.0 mm, whereas the maximum reflection loss increases by 8.45 dB, and the effective absorption band is broadened by 2.73 GHz when the matching thickness is 2.5 mm. The structure and morphology of RGO/Fe3O4 significantly changes by Co addition, which effectively improves the composites' absorption properties.-
Key words:
- reduced graphene oxide(RGO) /
- ferroferric oxide /
- Co-doped /
- composites /
- microwave absorbing properties
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參考文獻
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