Abstract The graphene encapsulated polypyrrole-graphene nanocomposites containing 0 to 0.2 wt% of graphene have been synthesized through in-situ chemical oxidative polymerization method. The electromagnetic shielding and dielectric behaviour of nanocomposite have been investigated in X-band (8.2–12.4 GHz) of microwave region. Nanocomposite containing 0.2 wt% of graphene (PG2) possess maximum shielding effectiveness due to absorption (SEA) ~ 33 dB and least due to reflection (SER) ≪ 1 dB in X-band. PG2 nanocomposite also has minimum skin depth ~250 μm (a criteria to decide the thickness of material for microwave application) and maximum attenuation constant. Enhanced microwave absorption and extremely suppressed reflection is attributed to increased dielectric loss. Increased dielectric loss is ascribed to formation of multiple interfaces, interfacial polarization, and formation of conducting pathways due to encapsulation of graphene in polypyrrole-graphene nanocomposites. The material exhibiting increased absorption and decreased reflection could be useful for many important applications such as stealth technology in aerospace, microwave communications, and checking of electromagnetic pollution.

中文翻译：

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石墨烯包封的聚吡咯-石墨烯纳米复合材料在 X 波段的电磁屏蔽性能的改善

摘要 通过原位化学氧化聚合法合成了石墨烯包封的聚吡咯-石墨烯纳米复合材料，其中含有0-0.2 wt%的石墨烯。纳米复合材料的电磁屏蔽和介电行为已在微波区域的 X 波段（8.2-12.4 GHz）进行了研究。含有 0.2 wt% 石墨烯 (PG2) 的纳米复合材料由于吸收 (SEA) ~ 33 dB 而具有最大的屏蔽效果，而由于反射 (SER) 在 X 波段具有最小的 ≪ 1 dB。PG2 纳米复合材料还具有~250 μm 的最小趋肤深度（决定微波应用材料厚度的标准）和最大衰减常数。增强的微波吸收和极度抑制的反射归因于增加的介电损耗。增加的介电损耗归因于形成多个界面，界面极化，以及由于石墨烯封装在聚吡咯-石墨烯纳米复合材料中而形成的导电通路。这种表现出增加吸收和减少反射的材料可用于许多重要的应用，例如航空航天、微波通信和电磁污染检查中的隐形技术。