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On tunneling effects in metal-deposited polyethylene-carbon black and polycarbonate-carbon black systems
Copyright policy )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.
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
Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, General Materials Science
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
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.