Article (Scientific journals)
Nanoparticles dispersed in liquid crystals: impact on conductivity, low-frequency relaxation and electro-optical performance
Urbanski, Martin; Lagerwall, Jan
2016In Journal of Materials Chemistry C, 4 (16), p. 3485-3491
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Abstract :
[en] We study the impact of functionalized gold nanoparticles on the impedance response of nematic nanoparticle/liquid crystal dispersions in the frequency range of 0.1 Hz–100 kHz. By fitting a suitable equivalent electric circuit model to the experimental data we show that nanoparticle doping does not affect the permittivity of the nematic host, but significantly increases its conductivity. This causes a Debye-type relaxation process in the Hz and low kHz regime, which originates from mobile charge carriers accumulating near the electrodes of the test cell. The effect of this electrode polarization on the electro-optical response of the nanocomposites is discussed with respect to threshold voltage and dielectric permittivity. We demonstrate that nanoparticle doping does not alter the electro-optic response at frequencies above the occurrence of electrode polarization, while it strongly deteriorates the performance in the low frequency regime.
Disciplines :
Chemistry
Author, co-author :
Urbanski, Martin ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Lagerwall, Jan  ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
External co-authors :
no
Language :
English
Title :
Nanoparticles dispersed in liquid crystals: impact on conductivity, low-frequency relaxation and electro-optical performance
Publication date :
29 March 2016
Journal title :
Journal of Materials Chemistry C
ISSN :
2050-7534
Publisher :
Royal Society of Chemistry, United Kingdom
Volume :
4
Issue :
16
Pages :
3485-3491
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
FnR Project :
FNR9170337 - Dielectric Spectroscopy Study On Nematic Gold Nanoparticle Dispersions, 2014 (01/03/2015-28/02/2017) - Martin Urbanski
Name of the research project :
DISGONA
Funders :
FNR - Fonds National de la Recherche [LU]
Available on ORBilu :
since 29 September 2016

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