• 文献标题:   Oxidating Fresh Porous Graphene Networks toward Ultra-Large Graphene Oxide with Electrical Conductivity
  • 文献类型:   Article
  • 作  者:   ZHANG PL, HE P, ZHAO YF, YANG SW, YU QK, XIE XM, DING GQ
  • 作者关键词:   crystal structure, efficient oxidation, large size, mechanical propertie, thermal conductivitie
  • 出版物名称:   ADVANCED FUNCTIONAL MATERIALS
  • ISSN:   1616-301X EI 1616-3028
  • 通讯作者地址:  
  • 被引频次:   3
  • DOI:   10.1002/adfm.202202697 EA AUG 2022
  • 出版年:   2022

▎ 摘  要

Ultra-large graphene oxide (ULGO) is one of the most important graphene derivates because of its processability in constructing various macrostructures with unique properties. However, existing oxidation-exfoliation technologies are limited in the available size range, structure controllability, and preparation efficiency of ULGO by the slow oxidant diffusion among graphite interlayers. Herein, a highly efficient strategy to fabricate ULGO featuring the oxidation of porous graphene networks freshly derived from electrochemical delamination, which highlights the significance of not only creation but also keeping of the fast diffusion channels for oxidant, is proposed. Consuming only 40 min and ultralow oxidant dosage (1 wt equiv.), this economical oxidation realizes high-yield preparation (approximate to 99.5%) of ULGO with record-large average size (188.3 mu m) and unusual low-defect structure. Unlike previous reports, free-standing films assembled from the as-prepared ULGO exhibit an unexpected electrical conductivity (305.3 S m(-1)) alongside record-breaking mechanical properties (21.2 GPa in Young's modulus, 392.1 MPa in tensile strength). Also, the advantage of ULGO in constructing commercially desirable thick graphene films with high thermal conductivity is demonstrated (approximate to 100 mu m, 1576.1 +/- 26.7 W m(-1) K-1). This new strategy based on new findings in mechanism provides a highly efficient route to enlarge lateral size and expand physical properties of graphene oxide.