Dispersion of nanoparticles in liquid crystals by sputtering and its effect on the electrooptic properties

Yoshida, Hiroyuki; Kawamoto, Kosuke; Tanaka, Yuma et al.

IEICE Transactions on Electronics, 2010, E93-C(11), 1595-1601

Number of Access:289（2025-09-02 10:25 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/75685

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Title
Dispersion of nanoparticles in liquid crystals by sputtering and its effect on the electrooptic properties
Creator
NRID
1000080550045 1000080550045
researchmap permalink
hiroyukiyoshida hiroyukiyoshida
Scopus Author ID
55628543086 55628543086
CreatorName
Yoshida, Hiroyuki
CreatorName
Kawamoto, Kosuke
CreatorName
Tanaka, Yuma
CreatorName
Kubo, Hitoshi
NRID
1000080304020 1000080304020
ORCID
0000-0003-3142-1193 0000-0003-3142-1193
researchmap permalink
read0054804 read0054804
Scopus Author ID
35413649300 35413649300
CreatorName
Fujii, Akihiko
NRID
1000050204186 1000050204186
ORCID
0000-0002-9556-4225 0000-0002-9556-4225
researchmap permalink
read0014092 read0014092
Scopus Author ID
55490143900 55490143900
CreatorName
Ozaki, Masanori
Subject
liquid crystals
nanoparticles
sputtering
Abstract
The authors describe a method to produce gold nanoparticle-dispersed liquid crystals by means of sputtering, and discuss how the presence of gold nanoparticles affect the electro-optic response of the host liquid crystal. The method exploits the fact that liquid crystals possess low vapor pressures which allow them to undergo the sputtering process, and the target material is sputtered directly on the liquid crystal in a reduced air pressure environment. The sample attained a red-brownish color after sputtering, but no aggregations were observed in the samples kept in the liquid crystal phase. Polarization optical microscopy of the sample placed in a conventional sandwich cell revealed that the phase transition behaviour is affected by the presence of the nanoparticles and that the onset of the nematic phase is observed in the form of bubble-like domains whereas in the pure sample the nematic phase appears after the passing of a phase transition front. Transmission electron microscopy confirmed the presence of single nano-sized particles that were dispersed without forming aggregates in the material. The electro-optic properties of the nanoparticle-dispersed liquid crystal was investigated by measuring the threshold voltage for a twisted-nematic cell. The threshold voltage was found to depend on the frequency of the applied rectangular voltage, and at frequencies higher than 200Hz, the threshold became lower than the pure samples.
Publisher
電子情報通信学会
The Institute of Electronics, Information and Communication Engineers
Source Title
IEICE Transactions on Electronics
Volume (Issue)
E93-C(11)
Page
1595-1601
Date of Issued
2010-11-01
Language
English
Handle URL
https://hdl.handle.net/11094/75685
PISSN
09168524
eISSN
17451353
NCID
AA10826283
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1587/transele.e93.c.1595
Access Rights
open access
CopyRight
copyright©2010 IEICE
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article