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19 results on '"Nirmalraj, Peter N."'

10. Manipulating Connectivity and Electrical Conductivity in Metallic Nanowire Networks

Author

Nirmalraj, Peter N., primary, Bellew, Allen T., additional, Bell, Alan P., additional, Fairfield, Jessamyn A., additional, McCarthy, Eoin K., additional, O’Kelly, Curtis, additional, Pereira, Luiz F. C., additional, Sorel, Sophie, additional, Morosan, Diana, additional, Coleman, Jonathan N., additional, Ferreira, Mauro S., additional, and Boland, John J., additional

Published
2012
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18. Nanoscale Mapping of Electrical Resistivity and Connectivity in Graphene Strips and Networks.

Author

Nirmalraj, Peter N., Lutz, Tarek, Kumar, Shishir, Duesberg, Georg S., and Boland, John J.

Abstract

In this article we map out the thickness dependence of the resistivity of individual graphene strips, from single layer graphene through to the formation of graphitic structures. We report exceptionally low resistivity values for single strips and demonstrate that the resistivity distribution for single strips is anomalously narrow when compared to bi- and trilayer graphene, consistent with the unique electronic properties of single graphene layers. In agreement with theoretical predictions, we show that the transition to bulklike resistivities occurs at seven to eight layers of graphene. Moreover, we demonstrate that the contact resistance between graphene flakes in a graphene network scales with the flake thickness and the implications for transparent conductor applications are discussed. [ABSTRACT FROM AUTHOR]

Published
2011
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19. Transparent, flexible, and highly conductive thin films based on polymer-nanotube composites.

Author

De S, Lyons PE, Sorel S, Doherty EM, King PJ, Blau WJ, Nirmalraj PN, Boland JJ, Scardaci V, Joimel J, and Coleman JN

Abstract

We have prepared flexible, transparent, and very conducting thin composite films from poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate), filled with both arc discharge and HIPCO single-walled nanotubes, at high loading level. The films are of high optical uniformity. The arc discharge nanotube-filled composites were significantly more conductive, demonstrating DC conductivities of >10(5) S/m for mass fractions >50 wt %. The ratio of DC to optical conductivity was higher for composites with mass fractions of 55-60 wt % than for nanotube-only films. For an 80 nm thick composite, filled with 60 wt % arc discharge nanotubes, this conductivity ratio was maximized at sigma(DC)/sigma(Op) = 15. This translates into transmittance (550 nm) and sheet resistance of 75 and 80 Omega/square, respectively. These composites were electromechanically very stable, showing <1% resistance change over 130 bend cycles.

Published
2009
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