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30 September 1996 Laser-induced permanent electrical conductivity in insulating metal-polymer composites
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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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Harvey M. Phillips, Yunjun Li, Binglin Zhang, and Chengwu An "Laser-induced permanent electrical conductivity in insulating metal-polymer composites", Proc. SPIE 2888, Laser Processing of Materials and Industrial Applications, (30 September 1996);

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