Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Microwave Irradiation on Exfoliation of Graphene Oxide

마이크로파 조사가 산화그래핀의 화학적 박리에 미치는 효과

  • Lee, Jae-Hee (Department of Materials Science & Engineering, Chungnam National University) ;
  • Hwang, Ki-Wan (Department of Materials Science & Engineering, Chungnam National University) ;
  • Jeong, Young-Hoon (Department of Materials Science & Engineering, Chungnam National University) ;
  • Kim, Eui-Tae (Department of Materials Science & Engineering, Chungnam National University)
  • 이재희 (충남대학교 공과대학 재료공학과) ;
  • 황기완 (충남대학교 공과대학 재료공학과) ;
  • 정영훈 (충남대학교 공과대학 재료공학과) ;
  • 김의태 (충남대학교 공과대학 재료공학과)
  • Received : 2013.10.10
  • Accepted : 2013.11.19
  • Published : 2013.12.27
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Abstract

Graphene oxide has been synthesized by microwave-assisted exfoliation of graphite oxide prepared by modified Hummers method. Graphite was oxidized in a solution of $H_2O_2$ and $KMnO_4$ at $65{\sim}80^{\circ}C$, followed by 10 % $H_2O_2$ solution treatment at $80{\sim}90^{\circ}C$. The graphite oxide was exfoliated under microwave irradiation of 1 kW and was reduced to graphene effectively by hydrazine hydrate ($H_4N_2{\cdot}H_2O$) treatment. The exfoliation of graphene oxide was significantly affected by the microwave irradiation on (heating)/off (cooling) period. An on/off period of 10 s/20 s resulted in much more effective exfoliation than that of 5 s/10 s with the same total treatment time of 10 min. This can be explained by the higher exfoliation temperature of 10 s/20 s. Repetition of the graphite oxidation and exfoliation processes also enhanced the exfoliation of graphene oxide. The thickness of the final graphene products was estimated to be several layers. The D band peaks of the Raman spectra of the final graphene products were quite low, suggesting a high crystal quality.

Keywords

References

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