Utilizing ammonium persulfate assisted expansion to fabricate flexible expanded graphite films with excellent thermal conductivity by introducing wrinkles

Traditional expanded graphite films exhibit excellent electric and thermal conductivities, due to weak oxidation degree induced low defect density

Yuhang Liu; Bingxin Qu; Xunen Wu; Yuxin Tian; Kai Wu; Bowen Yu; Rongni Du; Qiang Fu; Feng Chen

2019

Scholarcy highlights

  • Traditional expanded graphite films exhibit excellent electric and thermal conductivities, due to weak oxidation degree induced low defect density
  • The weak oxidation can effectively reduce the surface energy mismatching between EG and water, making it possible for EG to be exfoliated in water by high-speed shearing combined with sonication
  • The expansion step introduces plenty of wrinkles into the EG sheets, which notably improve the flexibility of EG films
  • The prepared EG films exhibit good electric and thermal conductivities of 2977 S/cm, 854 W/mK, respectively. 33.1 dB EMI shielding property is obtained with the film thickness of only 10 μm
  • 800 times direct bending can be overcome without any structure break. This facial large scale and environmentally friendly method endows the films with great potential applications in flexible electric devices

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