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Publication . Article . 1986

On tunneling effects in metal-deposited polyethylene-carbon black and polycarbonate-carbon black systems

T.A. Ezquerra; Calleja F.J. Baltá; J. Plans;
Closed Access
Published: 01 Jun 1986 Journal: Journal of Materials Research, volume 1, pages 510-514 (issn: 0884-2914, eissn: 2044-5326, Copyright policy )
Publisher: Springer Science and Business Media LLC

Electrical conductivity for polyethylene-carbon black, polycarbonate-carbon black composites was measured for conducting compositions well above the percolation limit. Three conductivity methods were employed in our studies: sputtering coated metal electrodes, painted metal electrodes, and the four-point method. Results suggest that while the two latter methods do not modify substantially the material surface, the former method introduces a low conductivity region at the surface. The effect of contact resistance developed during metal coating is discussed in the light of both fluctuation-induced tunneling predictions and “hopping” transport mechanisms. Experimental results favor the tunneling alternative across the evaporated metalcomposite interphase.

Subjects by Vocabulary

Microsoft Academic Graph classification: Metal visual_art.visual_art_medium visual_art Composite material Sputtering Contact resistance Carbon black Percolation Conductivity Materials science Polyethylene chemistry.chemical_compound chemistry Electrical resistivity and conductivity


Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, General Materials Science