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APPLICATION OF ELECTROLESS METAL DEPOSITION FOR ADVANCED COMPOSITE SHIELDING MATERIALS

V. Bogush1,*

Affiliation

  1. Belarusian State University of Informatics and Radioelectronics, Building 1, 6, P. Brovka str., Minsk 220013 Belarus

Abstract

This paper presents the principles of formation and properties of new fibre composite materials for electromagnetic shields. Composite fibres consist of organic basis and metallic particles formed on surface and in the volume of fibre using electroless deposition technology. Polyacrylonitrile was the main type of fibres material that employed for modification and creation of composite structure. Polymer-like transformation of polyacrylonitrile was used to increase chemisorption properties. Clusters of magnetic and highly conductive metals embedded into fibre volume have sub micron size as derived from microstructure investigation. It was found that nanometre size particles of nickel, cobalt and their alloys can be formed from metal ions bounded to fibre with following electroless deposition using either sodium hydrosulphite or sodium hypophosphite as a reducing agent. As deposited materials were shown to have very low stability in air so the principles of protection with surfactants were proposed. Electrical conductivity, magnetic properties of fibre materials and shielding efficiency of electromagnetic wave absorbers in wide frequency range were studied. Special attention was given to application of knitting technology for electromagnetic wave absorbers and shields fabrication. The modular broadband electromagnetic absorbers and shields were developed and tested. It was shown that using multilayer combination of linen composites based on Ni and Co provides increase of shielding efficiency module up to 70 dB with decrease the reflection coefficient down to 25 dB in the frequency range 1-118 GHz. Possible applications of new materials and structures for reducing harmful electromagnetic radiation effects and unwanted radiation of electronic devices were discussed..

Keywords

Composite material, Fibre, Electroless deposition, Shielding efficiency.

Submitted at: Jan. 19, 2005
Accepted at: May 26, 2005

Citation

V. Bogush, APPLICATION OF ELECTROLESS METAL DEPOSITION FOR ADVANCED COMPOSITE SHIELDING MATERIALS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 3, pp. 1635-1642 (2005)