Tuneable conductivity at extreme electric fields in ZnO tetrapod-silicone composites for high-voltage power cable insulation
Artikel i vetenskaplig tidskrift, 2022

Resistive Field Grading Materials (RFGM) are used in critical regions in the electrical insulation system of high-voltage direct-current cable systems. Here, we describe a novel type of RFGM, based on a percolated network of zinc oxide (ZnO) tetrapods in a rubber matrix. The electrical conductivity of the composite increases by a factor of 108 for electric fields > 1 kV mm-1, as a result of the highly anisotropic shape of the tetrapods and their significant bandgap (3.37 eV). We demonstrate that charge transport at fields < 1 kV mm-1 is dominated by thermally activated hopping of charge carriers across spatially, as well as energetically, localized states at the ZnO-polymer interface. At higher electric fields (> 1 kV mm-1) band transport in the semiconductive tetrapods triggers a large increase in conductivity. These geometrically enhanced ZnO semiconductors outperform standard additives such as SiC particles and ZnO micro varistors, providing a new class of additives to achieve variable conductivity in high-voltage cable system applications.


Helena Greijer

Hitachi ABB Power Grids

Nicola Mirotta

Istituto per la Sintesi Organica e la Fotoreattività (ISOF-CNR)

E. Treossi

Istituto per la Sintesi Organica e la Fotoreattività (ISOF-CNR)

Filippo Valorosi

Istituto per la Sintesi Organica e la Fotoreattività (ISOF-CNR)

Fabian Schütt

Christian-Albrechts-Universität zu Kiel

Leonard Siebert

Christian-Albrechts-Universität zu Kiel

Yogendra Kumar Mishra

Syddansk Universitet

Rainer Adelung

Christian-Albrechts-Universität zu Kiel

Vincenzo Palermo

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Istituto per la Sintesi Organica e la Fotoreattività (ISOF-CNR)

Henrik Hillborg

Hitachi ABB Power Grids

Scientific Reports

2045-2322 (ISSN)

Vol. 12 1 6035-



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