Highly conducting graphene sheets and Langmuir–Blodgett films

We report that the exfoliation-reintercalation-expansion of graphite can produce high-quality single-layer graphene sheets stably suspended in organic solvents

Xiaolin Li; Guangyu Zhang; Xuedong Bai; Xiaoming Sun; Xinran Wang; Enge Wang; Hongjie Dai

2008

Scholarcy highlights

  • In the current work, to make high quality graphene sheet, we started by first exfoliating commercial expandable-graphite by brief heating to 1000°C in forming gas
  • We report that the exfoliation-reintercalation-expansion of graphite can produce high-quality single-layer graphene sheets stably suspended in organic solvents
  • The chemically derived high quality graphene sheets could lead to future scalable graphene devices
  • For over hundreds of graphene sheets measured, we found that the single-layer GS have an average size of about 250nm and topographic height of ~ 1nm
  • Our starting expandable graphite was prepared by chemical intercalation of sulfuric acid and nitric acid
  • We suggest that TBA insert into oleum-intercalated graphite to increase the distance between adjacent graphitic layers, which facilitated the separation of graphene sheets upon sonication in a surfactant solution
  • The transferred graphene sheet LB film was typically calcined at 350 oC to remove DSPE-mPEG and TBA residues before transparency and resistance measurement

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