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Electrical signals in polytetrafluoroethylene matrix nanocomposites under the action of weak laser shock waves

Yurij Nikiforov 1Bogdan Kovalyuk 1Mihajlo Nischenko 2Olga Rzheshevska 1Volodymyr Hlado 1

1. Ternopil Ivan Pul'uj State Technical University, Ruska, 56, Ternopil 46000, Ukraine
2. G.V. Kurdyumov Institute for Metal Physics National Academy of Sciences (IMP), Vernadsky Blvd. 36, Kyiv UA03680, Ukraine

Abstract

The process of the formation of electrical signals   in polymer composite materials  subjected to shock waves generated  by a laser were investigated. The laser shock waves (LSW) were formed by using a Q-switched GOS-1001 neodymium-glass laser.
Electrical contacts withstanding fast the mechanical loads caused by the LSW action, were applied. For making  the contacts a  method of chemical metallization was used. Taking advantage of a  scanning electronic microscopy SEM-106 the morphological structure of the metallic coating of polytetrafluoroethylene and polytetrafluoroethylene specimens with different weight fillings of carbon nanotubes was investigated as well as the metal-polymer border cut off. Numerous micro-pits, nano- and micro-pores were found. The adhesion properties of surfaces of polytetrafluoroethylene reinforced with nanotubes  are stronger than those without nanotubes. Factors which affect the adhesion strength have been analysed.
Electrical signals which achieve more than hundreds millivolts in magnitude after LSW - treatment of the specimens were found experimentally in the polytetrafluorethylene matrix filled with  carbon nanotubes. A comparison of the obtained signals in different materials was carried out. The investigation  of the resistance and the capacity which were measured at 1 MHz  proved  that the capacity of a polytetrafluorethylene matrix containing carbon nanotubes is   3-4 times higher  than a polytetrafluoroethylene matrix without nanotubes, when geometry and dimensions of the specimens are kept the same. The nature of the appearing signals, which is likely to be caused by the behavior characteristics of the quantum-mechanical bonds of carbon nanotubes under LSW action, has been analysed.

 

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Related papers

Presentation: Poster at E-MRS Fall Meeting 2008, Symposium F, by Bogdan Kovalyuk
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-05-12 14:47
Revised:   2009-06-07 00:48