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0.5μm thick graphene films printed on plastic substrates exhibit metallic type conduction with a positive value of 1.5× 10-3 K-1 for the temperature coefficient of resistance over the temperature range from 260K to 330K. The crystallites of approximately 6.5nm in their average size in the film are found from the X-Ray diffraction pattern to be oriented preferentially along [002] plane.
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