链状核壳Ni@Cu/RGO复合材料的制备及其吸波性能研究
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摘要
采用简单的溶液原位还原法,成功制得链状核壳镍包覆铜负载还原氧化石墨烯(Ni@Cu/RGO)复合材料。利用X射线衍射(XRD)、扫描电镜(SEM)、拉曼光谱仪(Raman)和透射电镜(TEM)等对其形貌、结构、物化性质进行表征,同时还对Ni@Cu/RGO复合材料的形成机理进行了研究。结果表明,核壳镍包覆铜(Ni@Cu)为链状核壳结构,且均匀地负载于还原氧化石墨烯(RGO)上。利用矢量网络分析仪(VNA)对其吸波性能进行测试,Ni@Cu/RGO复合材料表现出优异的吸波性能,在Ni@Cu/RGO厚度为2.5mm,吸波频率为9.3GHz条件下,最小反射损耗可达-38.36dB。这种优良的吸波性能主要得益于更多的界面极化、自然共振、多重反射等因素。
The core-shell structure Ni@Cu/reduced graphene oxide(RGO)composites with nano-chains were successfully prepared via simple solution in-situ reduction.The morphology,structure and physicochemical properties of composites were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),Raman and TEM.The formation mechanism of Ni@Cu/RGO was studied in detail.The results showed that the chain-like Ni@Cu with coreshell structure was uniformly loaded on graphene.The wave absorption performance was tested by Agilent VNA.The composites showed excellent absorbing performance when the absorbing thickness was 2.5 mm and the absorption frequency was 9.3 GHz,the minimum reflection loss(RLmin)was-38.36 dB.This excellent absorption performance was mainly due to more interface polarization,natural resonance and multiple reflection.
The core-shell structure Ni@Cu/reduced graphene oxide(RGO)composites with nano-chains were successfully prepared via simple solution in-situ reduction.The morphology,structure and physicochemical properties of composites were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),Raman and TEM.The formation mechanism of Ni@Cu/RGO was studied in detail.The results showed that the chain-like Ni@Cu with coreshell structure was uniformly loaded on graphene.The wave absorption performance was tested by Agilent VNA.The composites showed excellent absorbing performance when the absorbing thickness was 2.5 mm and the absorption frequency was 9.3 GHz,the minimum reflection loss(RLmin)was-38.36 dB.This excellent absorption performance was mainly due to more interface polarization,natural resonance and multiple reflection.
引文
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[3]Wang C,Han X,Xu P,et al.Controlled synthesis of hierarchical nickel and morphology-dependent electromagnetic properties[J].The Journal of Physical Chemistry C,2010,114(7):3196-3203.
[4]Zhao B,Shao G,Fan B,et al.Preparation and electromagnetic wave absorption properties of novel dendrite-like NiCu alloy composite[J].RSC Advances,2015,5(53):42587-42590.
[5]Zhang S,Zeng H C.Solution-based epitaxial growth of magnetically responsive Cu@Ni nanowires[J].Chemistry of Materials,2014,22(4):1282-1284.
[6]李琳.二茂铁基手性聚Schiff碱的合成与表征及吸波性能研究[D].南昌:南昌航空大学,2016.
[7]郭晓琴.磁性纳米粒子负载石墨烯的结构调控及吸波机理研究[D].郑州:郑州大学,2016.
[8]Wu H,Wang L,Guo S,et al.Electromagnetic and microwaveabsorbing properties of highly ordered mesoporous carbon supported by gold nanoparticles[J].Materials Chemistry&Physics,2012,133(2/3):965-970.
[9]Wu H,Wu G,Ren Y,et al.Co2+/Co3+ratio dependence of electromagnetic wave absorption in hierarchical NiCo2O4-CoNiO2hybrids[J].Journal of Materials Chemistry C,2015,3(29):7677-7690.
[10]Zhang Y,Zhang X,Quan B,et al.A facile self-template strategy for synthesizing 1Dporous Ni@C nanorods towards efficient microwave absorption[J].Nanotechnology,2017,28(11):115704.
[11]Tong G,Yuan J,Wu W,et al.Flower-like Co superstructures:morphology and phase evolution mechanism and novel microwave electromagnetic characteristics[J].Crystengcomm,2012,14(6):2071-2079.