마이크로파 조사가 산화그래핀의 화학적 박리에 미치는 효과

이재희; 황기완; 정영훈; 김의태; Jae-Hee Lee; Ki-Wan Hwang; Young-Hoon Jeong; Eui-Tae Kim

Korean Journal of Materials Research, Vol.23, No.12, 708-713, December, 2013

DOI10.3740/MRSK.2013.23.12.708 Export Citation

마이크로파 조사가 산화그래핀의 화학적 박리에 미치는 효과

Effect of Microwave Irradiation on Exfoliation of Graphene Oxide

이재희, 황기완, 정영훈, 김의태^†

충남대학교 공과대학 재료공학과

Jae-Hee Lee¹, Ki-Wan Hwang^{1, 2}, Young-Hoon Jeong^{1, 2}, and Eui-Tae Kim^{1, 2, †}

¹Department of Materials Science & Engineering, Chungnam National University, Daejeon 305-764, Korea
²ABC Nanotech Co. Ltd.,, Yuseong-gu, Daejeon 305-500, Korea

E-mail:

Graphene oxide has been synthesized by microwave-assisted exfoliation of graphite oxide prepared by modified Hummers method. Graphite was oxidized in a solution of H2SO4 and KMnO4 at 65~80 oC, followed by 10 % H2O2 solution treatment at 80~90 oC. The graphite oxide was exfoliated under microwave irradiation of 1 kW and was reduced to graphene effectively by hydrazine hydrate (H4N2·H2O) 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:graphene;graphene oxide;graphite;microwave;exfoliation

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[1] Stoller MD, Park S, Zhu Y, An J, Ruoff RS, Nano Lett., 8, 3498 (2008)

[2] Zhu Y, Murali S, Stoller MD, Velamakanni A, Piner RD, Ruoff RS, Carbon, 48, 2118 (2010)

[3] Xu B, Yue S, Sui Z, Zhang X, Hou S, Caoa G, Yang Y, Energy Environ. Sci., 4, 2826 (2011)

[4] Novoselov KS, Geim AK, Morozov SV, Jiang D, Zhang Y, Dubonos SV, Grigorieva IV, Firsov AA, Science, 306, 666 (2004)

[5] Novoselov KS, Jiang D, Schedin F, Booth TJ, Khotkevich VV, Morovoz SV, Geim AK, Proc. Natl. Acad. Sci. U.S.A., 105, 10451 (2005)

[6] Niyogi S, Bekyarova E, Itkis ME, McWilliams JL, Hamon MA, Haddon RC, J. Am. Chem. Soc., 128(24), 7720 (2006)

[7] Navarro CG, Weitz RT, Bittner AM, Scolari M, Mews A, Burghrd M, Kern K, Nano Lett., 7, 3499 (2007)

[8] Rutter GM, Crain JN, Guisinger NP, Li T, First PN, Stroscio JA, Science, 317, 219 (2007)

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[12] Li XS, Cai WW, Colombo L, Ruoff S, Nano Lett., 9, 4268 (2009)

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