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Impact of interfacial structure on the charge dynamics in nanocomposite dielectrics
KTH, School of Electrical Engineering and Computer Science (EECS), Electromagnetic Engineering.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Polymeric Materials. ABB Corporate Research, Västerås, SE 72178, Sweden.ORCID iD: 0000-0002-3149-4045
2019 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 125, no 4, article id 045109Article in journal (Refereed) Published
Abstract [en]

We demonstrate that the chemistry at the interface between nanoparticle and polymer matrix influence charge dynamics in polymer nanocomposite. Applying density functional theory, we investigate the influence of crystal surface termination, silicon treatment, and water and carboxyl defect on the electronic properties of interfaces in MgO-polyethylene nanocomposite. The band offsets between the nanofiller and base matrix materials show a strong dependence on the chemical composition at the interface. Based on the calculated electronic structure, we propose a band alignment model for charge dynamics in nanocomposite dielectrics. The model not only provides a mechanism of reduction of space charge and conductivity but also predicts an increase in thermal stress and susceptibility to the chemical additives. It is suggested that the suppression mechanisms of space charge and conductivity in nanocomposites can be inherently unstable and promote material aging. The results of the study show a need for long-term performance tests of nanocomposite dielectrics.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019. Vol. 125, no 4, article id 045109
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-244215DOI: 10.1063/1.5078800ISI: 000457409600032Scopus ID: 2-s2.0-85061039067OAI: oai:DiVA.org:kth-244215DiVA, id: diva2:1289565
Note

QC 2019018

Available from: 2019-02-18 Created: 2019-02-18 Last updated: 2019-02-22Bibliographically approved

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Unge, Mikael

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