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Title: Br treated graphite nanoplatelets for improved electrical conductivity of polymer composites
Authors: Li, Jing
Vaisman, Linda
Marom, Gad
Kim, Jang-Kyo
Keywords: Intercalation
Exfoliated graphite
Electrical properties
Issue Date: Apr-2007
Citation: Carbon, v. 45, iss. 4, Apr. 2007, p. 744-750
Abstract: The graphite nanoplatelets (GNP) were treated by vapor-phase bromination. The increase in weight and atomic concentration of Br indicated the bromine uptake. The intercalation of Br between graphene layers of GNP was confirmed by the X-ray diffraction result, showing an increase in the interlayer spacing from 3.342 Å to 3.361 Å. Two types of bonds between C and Br were introduced simultaneously, ionic and covalent bonds, both of them increased with bromination duration. The fraction of ionic bond reached the highest value by 3 h Br exposure, which corresponded to the highest electrical conductivity of GNP. Although the bromination treatment did not change the percolation threshold of composites, it increased the absolute value of electrical conductivity of composites when the filler content was higher than the percolation threshold.
Rights: Carbon © copyright 2007 Elsevier. The Journal's web site is located at
Appears in Collections:MECH Journal/Magazine Articles

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