Ultra-Precision Optical and Electronic Instrument Engineering Centre, Harbin Institute of Technology , Harbin 150001, People's Republic of China.
National Physical Laboratory, Hampton Road, Teddington TW11 0LW, United Kingdom.
ACS Appl Mater Interfaces. 2017 Oct 4;9(39):34221-34229. doi: 10.1021/acsami.7b09372. Epub 2017 Sep 20.
Conducting graphene-based hybrids have attracted considerable attention in recent years for their scientific and technological significance in many applications. In this work, conductive graphene hybrid films, consisting of a metallic network fully encapsulated between monolayer graphene and quartz-glass substrate, were fabricated and characterized for their electromagnetic interference shielding capabilities. Experimental results show that by integration with a metallic network the sheet resistance of graphene was significantly suppressed from 813.27 to 5.53 Ω/sq with an optical transmittance at 91%. Consequently, the microwave shielding effectiveness (SE) exceeded 23.60 dB at the K-band and 13.48 dB at the K-band. The maximum SE value was 28.91 dB at 12 GHz. Compared with the SE of pristine monolayer graphene (3.46 dB), the SE of graphene hybrid film was enhanced by 25.45 dB (99.7% energy attenuation). At 94% optical transmittance, the sheet resistance was 20.67 Ω/sq and the maximum SE value was 20.86 dB at 12 GHz. Our results show that hybrid graphene films incorporate both high conductivity and superior electromagnetic shielding comparable to existing ITO shielding modalities. The combination of high conductivity and shielding along with the materials' earth-abundant nature, and facile large-scale fabrication, make these graphene hybrid films highly attractive for transparent EMI shielding.
近年来，基于石墨烯的杂化材料因其在许多应用中的科学和技术意义而受到了广泛关注。在这项工作中，制备并表征了由金属网络完全封装在单层石墨烯和石英玻璃基底之间的导电石墨烯杂化薄膜，以研究其电磁干扰屏蔽性能。实验结果表明，通过与金属网络集成，石墨烯的面电阻从 813.27 Ω/sq 显著降低到 5.53 Ω/sq，同时光学透过率为 91%。因此，在 K 波段的微波屏蔽效能（SE）超过 23.60 dB，在 K 波段的屏蔽效能超过 13.48 dB。在 12 GHz 时，最大 SE 值为 28.91 dB。与原始单层石墨烯（3.46 dB）的 SE 相比，石墨烯杂化膜的 SE 提高了 25.45 dB（99.7%能量衰减）。在 94%的光学透过率下，面电阻为 20.67 Ω/sq，在 12 GHz 时最大 SE 值为 20.86 dB。我们的结果表明，杂化石墨烯薄膜兼具高导电性和与现有 ITO 屏蔽模式相当的优异电磁屏蔽性能。高导电性和屏蔽性能的结合，以及材料的丰富性、易于大规模制备等特点，使得这些石墨烯杂化薄膜在透明电磁干扰屏蔽方面具有很高的吸引力。
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