loading page

Efficient production of few-layer graphene by shear exfoliation of graphite in an aqueous liquid
  • +3
  • Mingyun Guo,
  • Jian Cui,
  • Guangfa Zhang,
  • Shuai Zhao,
  • Ailin Gao,
  • Yehai Yan
Mingyun Guo
Qingdao University of Science and Technology
Author Profile
Jian Cui
Qingdao University of Science and Technology
Author Profile
Guangfa Zhang
Qingdao University of Science and Technology
Author Profile
Shuai Zhao
Qingdao University of Science and Technology
Author Profile
Ailin Gao
Qingdao University of Science and Technology
Author Profile
Yehai Yan
Qingdao University of Science and Technology
Author Profile

Abstract

A water-soluble polymer stabilizer (VIB-co-VI-co-Py, Figure 1) assisted liquid-phase exfoliation (LPE), implemented by high-shear mixing rather than currently more often used bath/probe sonication, was developed as a new method for efficient production of few-layer graphene (FLG) in aqueous liquid. With help of VIB-co-VI-co-Py, stable aqueous dispersion of FLG forms in-situ with 90% of dispersed flakes of fewer than five layers and production rate up to 0.86 g h-1 by 5.0 L of aqueous liquid, representing the highest production rate per volume (0.17 g L-1 h-1) reported hitherto for LPE with the liquid volume no less than 5.0 L. The scale-up shear-exfoliated FLG exhibits high quality and excellent redispersibility in water, thus paving the way for a wide range of applications. As typical application demonstrations, the FLG-based flexible conductive films and polymer composite hydrogels were prepared and evaluated. The results show that the VIB-co-VI-co-Py exfoliated FLG performs well therein.