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Proceedings Paper

Laser-induced permanent electrical conductivity in insulating metal-polymer composites
Author(s): Harvey M. Phillips; Yunjun Li; Binglin Zhang; Chengwu An
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Paper Abstract

Laser induced permanent electrical conductivity was observed in polyimide and in initially non-conducting Ag/polyimide composites using the fourth harmonic of a Q-switched Nd:YAG laser. The critical number of laser pulses required for the metal-insulator phase transition in polyimide was less than 100, compared to the 300-350 pulses required when using a KrF excimer laser. The presence of the Ag in the composite contributed to the conducting volume fraction in the material and therefore further lowered the critical number of laser pulses to less than 50. These experiments represent a unique experimental demonstration of 'two-color' percolation, in which percolation occurs with two different types of conductors.

Paper Details

Date Published: 30 September 1996
PDF: 10 pages
Proc. SPIE 2888, Laser Processing of Materials and Industrial Applications, (30 September 1996); doi: 10.1117/12.253109
Show Author Affiliations
Harvey M. Phillips, Zhengzhou Univ. (China)
Yunjun Li, Zhengzhou Univ. (China)
Binglin Zhang, Zhengzhou Univ. (China)
Chengwu An, Huazhong Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 2888:
Laser Processing of Materials and Industrial Applications
Shu-Sen Deng; S. C. Wang, Editor(s)

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