Work

Electrical Properties of Semiconductor/Conductor Composites: Polypyrrole-Coated Tungsten Microparticles

Year: 2025

Type: article

Abstract: Tungsten microparticles were coated with globular or nanotubular polypyrrole in situ during the oxidation of pyrrole in aqueous medium with ammonium peroxydisulfate or iron(III) chloride, respectively. The resulting core–shell composites with various contents of tungsten were obtained as powders composed of metal particles embedded in a semiconducting polymer matrix. The coating of tungsten with polypyrrole was analysed by FTIR and Raman spectroscopies. The resistivity of composite powders was determined by the four-point van der Pauw method as a function of pressure applied up to 10 MPa. The degree of compression was also recorded and its relation to electrical properties is discussed on the basis of the percolation concept. The electrical properties of composites are afforded by polypyrrole matrix and they are independent of tungsten content. As the conducting tungsten particles are separated by polypyrrole shells, they cannot produce conducting pathways and behave similarly as a nonconducting filler.

Source: Journal of Composites Science

DOI: 10.3390/jcs9030098

Authors: Jaroslav Stejskal, Marek Jurča, Miroslava Trchová, Jan Prokeš

Institutions: Tomas Bata University in Zlín, University of Chemistry and Technology, Prague, Charles University

Language: English

Topic: Conducting polymers and applications

Subfield: Polymers and Plastics

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,172

Funder: Ministerstvo Školství, Mládeže a Tělovýchovy