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Tunable positive temperature coefficient of resistivity in an electrically conducting polymer/graphene composite

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5 Author(s)
Pang, Huan ; College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065 Sichuan, People’s Republic of China ; Zhang, Yi-Chuan ; Tao Chen ; Zeng, Bao-Qing
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The graphene nanosheet (GNS)/ultrahigh molecular weight polyethylene composite with a two-dimensional conductive network of GNSs exhibits an increasing positive temperature coefficient (PTC) of resistivity while thermally treated at a certain temperature. This anomalous phenomenon is originated from the reduced viscosity of polymer matrix, crystallization induced local flow and weak interactions among the overlapping joints of GNSs, which allow GNSs to migrate to the polymer matrix, thus weakening the conductive paths and increasing the PTC intensity. A facile approach is accordingly developed to prepare a conductive polymer composite with a tunable PTC intensity.

Published in:

Applied Physics Letters  (Volume:96 ,  Issue: 25 )

Date of Publication:

Jun 2010

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