• 文献标题:   Magnetic and conductive graphene papers toward thin layers of effective electromagnetic shielding
  • 文献类型:   Article
  • 作  者:   SONG WL, GUAN XT, FAN LZ, CAO WQ, WANG CY, ZHAO QL, CAO MS
  • 作者关键词:  
  • 出版物名称:   JOURNAL OF MATERIALS CHEMISTRY A
  • ISSN:   2050-7488 EI 2050-7496
  • 通讯作者地址:   Univ Sci Technol Beijing
  • 被引频次:   81
  • DOI:   10.1039/c4ta05939e
  • 出版年:   2015

▎ 摘  要

Graphene-based hybrids, specifically free-standing graphene-based hybrid papers, have recently attracted increasing attention in many communities for their great potential applications. As the most commonly used precursors for the preparation of graphene-based hybrids, electrically-insulating graphene oxides (GO) generally must be further chemically reduced or thermally annealed back to reduced GO (RGO) if high electrical conductivity is needed. However, various concerns are generated if the hybrid structures are sensitive to the treatments used to produce RGO. In this work, we develop a highly facile strategy to fabricate free-standing magnetic and conductive graphene-based hybrid papers. Electrically conductive graphene nanosheets (GNs) are used directly to grow Fe3O4 magnetic nanoparticles without additional chemical reduction or thermal annealing, thus completely avoiding the concerns in the utilisation of GO. The free-standing Fe3O4/GN papers are magnetic, electrically conductive and present sufficient magnetic shielding (>20 dB), making them promising for applications in the conductive magnetically-controlled switches. The shielding results suggest that the Fe3O4/GN papers of very small thickness (<0.3 mm) and light weight (similar to 0.78 g cm(-3)) exhibit comparable shielding effectiveness to polymeric graphene-based composites of much larger thickness. Fundamental mechanisms for shielding performance and associated opportunities are discussed.