Highly Conductive and Fracture-Resistant Epoxy Composite Based on Non-oxidized Graphene Flake Aerogel

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

14 Scopus Citations
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Author(s)

  • Jin Kim
  • Ne Myo Han
  • Jungmo Kim
  • Jinho Lee
  • Jang-Kyo Kim

Detail(s)

Original languageEnglish
Pages (from-to)37507-37516
Journal / PublicationACS Applied Materials and Interfaces
Volume10
Issue number43
Online published1 Oct 2018
Publication statusPublished - 31 Oct 2018
Externally publishedYes

Abstract

Graphene aerogel (GA) has shown great promise as reinforcement of polymeric composites with exceptional electrical and mechanical characteristics. Although there has been significant progress in controlling the structure of GAs, no studies have appeared on the enhanced properties of GAs by employing high-quality precursor graphene flakes (GFs). However, the assembly of high-quality GFs is particularly challenging due to their highly hydrophobic and agglomerative nature in aqueous media, and of the few methods available to synthesize high-quality GFs, most produce flakes with very small lateral sizes. Herein, we report the fabrication of highly crystalline GAs using large nonoxidized graphene flakes (NOGFs) prepared by a novel graphite intercalation compound-based method. Bidirectional freeze casting is utilized for aligning NOGFs in two orthogonal directions, vertically and laterally, where the NOGF walls individually function as effective conductive pathways. The as-prepared nonoxidized graphene aerogel (NOGA) exhibits a defect concentration as low as 1.4% of impurity oxygen with an excellent electrical conductivity of 202.9 S/m at a low density of 5.7 mg/cm3. The corresponding NOGA-epoxy composite shows a remarkable electrical conductivity of 122.6 S/m and a fracture toughness of 1.74 MPa·m1/2 at a low filler content of 0.45 vol %.

Research Area(s)

  • electrical composite, epoxy composite, fracture toughness, graphene aerogel, nonoxidized graphene flake

Citation Format(s)

Highly Conductive and Fracture-Resistant Epoxy Composite Based on Non-oxidized Graphene Flake Aerogel. / Kim, Jin; Han, Ne Myo; Kim, Jungmo; Lee, Jinho; Kim, Jang-Kyo; Jeon, Seokwoo.

In: ACS Applied Materials and Interfaces, Vol. 10, No. 43, 31.10.2018, p. 37507-37516.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal