Dresden 2017 – scientific programme
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DF: Fachverband Dielektrische Festkörper
DF 14: Various Topics II
DF 14.2: Talk
Wednesday, March 22, 2017, 15:20–15:40, GER 37
Local charge injection and extraction on surface-modified Al2O3 nanoparticles in LDPE — •Riccardo Borgani1, Love K. H. Pallon2, Mikael S. Hedenqvist2, Ulf W. Gedde2, and David B. Haviland1 — 1Nanostructure Physics, KTH Royal Institute of Technology, Stockholm, Sweden — 2Fibre and Polymer Technology, KTH Royal Institute of Technology, Stockholm, Sweden
Nanocomposite polymer insulators are promising materials for high voltage direct current power transmission, due to their very low leakage current. We image the injection of charges around surface-modified aluminum oxide nanoparticles in a low-density polyethylene (LDPE) matrix[1] using a recently developed atomic force microscopy technique. Intermodulation Electrostatic Force Microscopy[2] allows us to image the surface potential around the individual nanoparticles under different bias conditions. The experimental results are consistent with the presence of shallow trap states (localized electronic states) in the LDPE near the nanoparticles, providing experimental evidence for a previously proposed explanation of the enhanced insulating properties of nanocomposite LDPE.
[1] R. Borgani, L.K.H. Pallon, M.S. Hedenqvist, U.W. Gedde, and D.B. Haviland, Nano Lett. 16, 5934 (2016).
[2] R. Borgani, D. Forchheimer, J. Bergqvist, P.-A. Thorén, O. Inganäs, and D. B. Haviland, Appl. Phys. Lett. 105, 143113 (2014).