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Received July 21, 2011
Accepted September 5, 2011
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Synthesis of highly concentrated suspension of chemically converted graphene in organic solvents: Effect of temperature on the extent of reduction and dispersibility
Viet Hung Pham
Thanh Truong Dang
Tran Viet Cuong
Seung Hyun Hur
Byung-Seon Kong1
Eui Jung Kim
Jin Suk Chung†
School of Chemical Engineering and Bioengineering, University of Ulsan, 93, Daehak-ro, Nam-gu, Ulsan 680-749, Korea 1KCC Central Research Institute, 83, Mabook-dong, Giheung-gu, Yongin-si, Gyunggi-do 446-716, Korea
jschung@mail.ulsan.ac.kr
Korean Journal of Chemical Engineering, May 2012, 29(5), 680-685(6), 10.1007/s11814-011-0232-0
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Abstract
We report the effect of temperature on the extent of graphene oxide reduction by hydrazine and the dispersibility of the resulting chemically converted graphene (CCG) in polar organic solvents. The extent of graphene oxide reduction at high temperatures was only slightly higher than at low temperatures (30-50℃ ), while the dispersibility of the resulting CCG in organic solvents decreased markedly with increasing temperature. The low dispersibility of CCGs prepared_x000D_
at high temperatures was greatly affected by reduction and influenced by the formation of an irreversible agglomerate of CCG at high temperatures. The reduction of graphene oxide at low temperatures is necessary to prepare highly dispersible CCG in organic solvents. CCG prepared at 30 ℃ is dispersible in N-methyl-2-pyrrolidone concentrations as high as 0.71 mg/mL. The free-standing paper made of this CCG possessed an electrical conductivity of more than 22,000 S/m, one of the highest values ever reported.
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References
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Stankovich S, Dikin DA, Piner RD, Kohlhaas KA, Kleinhammes A, Jia Y, Wu Y, Nguyen SBT, Ruoff RS, Carbon., 45, 1558 (2007)
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Dougherty RC, J. Chem. Phys., 109(17), 7372 (1998)
Su CY, Xu Y, Zhang W, Zhao J, Tang X, Tsai CH, Li LJ, Chem. Mater., 21, 5674 (2009)
