Nickel oxide nanoparticles doped liquid crystal system for superior electro-optical properties

Hak Moo Lee, Hyung Koo Chung, Hong Gyu Park, Hae Chang Jeong, Jeong Hwan Kim, Tae Kyu Park, Dae Shik Seo

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We examined the properties of nematic liquid crystal (N-LC) systems with dispersed nickel oxide nanoparticles (NPs). Uniform LC alignments with regular pretilt angles were achieved on rubbed polymer surface regardless of NiO nanoparticles concentration. We confirmed the electro-optical characteristics of twisted nematic (TN) cells containing NiO nanoparticles on rubbed polymer surface, which exhibited lower threshold voltages and faster response times with less capacitance hysteresis than pure LC cells. It is clear that the response time of TN cells on rubbed polymer surfaces decreases with increasing the NiO nanoparticles concentration. These results demonstrate the relationship between NP doping concentration and trapping of impurity ions, and were confirmed by a software simulation of electric flux and field density. NiO nanoparticles in the LC cells focused the electric field flux and strengthened the electric field. Further, NiO nanoparticles in LC medium trapped charged ionic impurities and suppressed the screen effect, leading to a stronger electric field and the van der Waals interactions between LC molecules and the alignment layers.

Original languageEnglish
Pages (from-to)8139-8143
Number of pages5
JournalJournal of Nanoscience and Nanotechnology
Volume15
Issue number10
DOIs
Publication statusPublished - 2015 Oct 1

Fingerprint

Liquid Crystals
Nickel oxide
nickel oxides
doped crystals
Nanoparticles
Liquid crystals
Optical properties
liquid crystals
optical properties
nanoparticles
Polymers
Electric fields
cells
Reaction Time
electric fields
screen effect
polymers
alignment
Impurities
Fluxes

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Lee, Hak Moo ; Chung, Hyung Koo ; Park, Hong Gyu ; Jeong, Hae Chang ; Kim, Jeong Hwan ; Park, Tae Kyu ; Seo, Dae Shik. / Nickel oxide nanoparticles doped liquid crystal system for superior electro-optical properties. In: Journal of Nanoscience and Nanotechnology. 2015 ; Vol. 15, No. 10. pp. 8139-8143.
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Nickel oxide nanoparticles doped liquid crystal system for superior electro-optical properties. / Lee, Hak Moo; Chung, Hyung Koo; Park, Hong Gyu; Jeong, Hae Chang; Kim, Jeong Hwan; Park, Tae Kyu; Seo, Dae Shik.

In: Journal of Nanoscience and Nanotechnology, Vol. 15, No. 10, 01.10.2015, p. 8139-8143.

Research output: Contribution to journalArticle

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AU - Lee, Hak Moo

AU - Chung, Hyung Koo

AU - Park, Hong Gyu

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AU - Park, Tae Kyu

AU - Seo, Dae Shik

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AB - We examined the properties of nematic liquid crystal (N-LC) systems with dispersed nickel oxide nanoparticles (NPs). Uniform LC alignments with regular pretilt angles were achieved on rubbed polymer surface regardless of NiO nanoparticles concentration. We confirmed the electro-optical characteristics of twisted nematic (TN) cells containing NiO nanoparticles on rubbed polymer surface, which exhibited lower threshold voltages and faster response times with less capacitance hysteresis than pure LC cells. It is clear that the response time of TN cells on rubbed polymer surfaces decreases with increasing the NiO nanoparticles concentration. These results demonstrate the relationship between NP doping concentration and trapping of impurity ions, and were confirmed by a software simulation of electric flux and field density. NiO nanoparticles in the LC cells focused the electric field flux and strengthened the electric field. Further, NiO nanoparticles in LC medium trapped charged ionic impurities and suppressed the screen effect, leading to a stronger electric field and the van der Waals interactions between LC molecules and the alignment layers.

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