Synthesis of reduced graphene oxide-conducting polymers-Co3O4 composites and their excellent microwave absorption properties
Synthesis of reduced graphene oxide-conducting polymers-Co3O4 composites and their excellent microwave absorption properties
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DOI：
10.1039/c3ra43073a
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发表时间：
2013-01-01
期刊：
影响因子：
3.9
通讯作者：
Huang, Ying
中科院分区：
文献类型：
--
作者：
Liu, Panbo;Huang, Ying
本文采用三步法制备了氧化石墨烯、导电聚合物(聚苯胺、聚吡咯、聚(3，4-乙二氧基噻吩基))和纳米Co3O4三元复合材料。用红外光谱、X射线衍射仪、X射线光电子能谱、透射电子显微镜和拉曼光谱对复合材料的结构和形貌进行了表征。结果表明，Co3O4纳米粒子均匀分布在还原的氧化石墨烯导电聚合物(RGO-CPS)表面，直径在5~10 nm之间。三元复合材料优异的微波吸收性能主要源于Co3O4纳米粒子的偶极极化、电子自旋和电荷极化、RGO-CPS与Co3O4纳米粒子之间的有效互补以及RGO与CPS之间的固态电荷转移络合物。氧化石墨烯-聚苯胺-Co3O4、氧化石墨烯-聚吡咯-Co3O4和氧化石墨烯-聚(3，4-乙二氧基噻吩基)-Co3O4的最大反射损耗分别为-44.5、-43.5和-46.5分贝，反射损耗小于-10分贝的吸收带宽分别为4.3 GHz、6.4 GHz和2.1 GHz，厚度分别为3.3 mm、3.2 mm和3.1 mm。这种性能优良的吸波复合材料有望成为新型吸波材料的候选材料。
In this work, novel ternary composites consisting of reduced graphene oxide, conducting polymers (polyaniline, polypyrrole and poly (3,4-ethylenedioxythiophene)) and Co3O4 nanoparticles were successfully fabricated by a three-step method. The structure and morphology of the composites were characterized by FT-IR, XRD, XPS, TEM and Raman spectroscopy. The results showed that uniform Co3O4 nanoparticles with a diameter in the range of 5-10 nm were distributed on the surface of reduced graphene oxide-conducting polymers (RGO-CPs). The excellent microwave absorption properties of the ternary composites mainly originated from the dipole polarization, electronic spin and charge polarization of Co3O4 nanoparticles, the efficient complementarities between RGO-CPs and Co3O4 nanoparticles and the solid-state charge-transfer complex between RGO and CPs. The maximum reflection losses of reduced graphene oxide-polyaniline-Co3O4, reduced graphene oxide-polypyrrole-Co3O4 and reduced graphene oxide-poly (3,4-ethylenedioxythiophene)-Co3O4 are -44.5 dB, -43.5 dB and -46.5 dB, the absorption bandwidths with the reflection losses below -10 dB are 4.3 GHz, 6.4 GHz and 2.1 GHz with a thickness of 3.3 mm, 3.2 mm and 3.1 mm, respectively. Such excellent microwave absorption composites could be used as a new kind of candidate for the new types of microwave absorbing materials.