Abstract

The electrooptical properties of single-walled carbon-nanotube (SWCNT) mixed liquid-crystal (LC) cells fabricated by rubbing and ion-beam (IB) process are investigated. The increase of SWCNT concentration in the LC mixture led to a decrease in the threshold voltage of twisted nematic cells by reducing the screening effect. Threshold voltages of 1.3 and 1.7 V are lowered to 0.8 and 1.2 V, respectively, with SWCNT mixtures up to 10 x 10<sup>-3</sup> wt%. LC alignment characteristics including LC orientation state, transmittance spectra, pretilt angle, and thermal stability of LC cells are also observed.

© 2011 IEEE

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  19. H. Y. Chen, W. Lee, "Suppression of field screening in nematic liquid crystals by carbon nanotubes," Appl. Phys. Lett. 88, (2006) Art. ID 222105.
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  22. J. M. Geary, J. W. Goodby, A. R. Kmetz, J. S. Patel, "The mechanism of polymer alignment of liquid crystal materials," J. Appl. Phys. 62, 4100-4108 (1987).

2010

Y. S. Kwon, B. M. Jung, H. Lee, J. Y. Chang, "Preparation of polymeric SWNT-liquid crystal composites using a polymerizable surfactant," Macromolecules 43, 5376-5381 (2010).

2009

K. M. Lee, B. Y. Oh, Y. H. Kim, D. S. Seo, "Effect of ion beam irradiation and rubbing on the directional behavior and alignment mechanism of liquid crystals on polyimide surfaces," J. Appl. Phys. 105, (2009) Art. ID 014507.

2008

B. Y. Oh, K. M. Lee, B. Y. Kim, Y. H. Kim, J. W. Han, J. M. Han, S. K. Lee, D. S. Seo, "Surface reformation and electro-optical characteristics of liquid crystal alignment layers using ion beam irradiation," J. Appl. Phys. 104, (2008) Art. ID 064502.

C. Y. Lee, Y. L. Liu, K. Y. Wu, M. Y. Chen, J. C. Hwang, "Argon plasma beam scanning processes polyimide films for liquid crystal alignment," Jpn. J. Appl. Phys. 47, 226-230 (2008).

R. Dhar, A. S. Pandey, M. B. Pandey, S. Kumar, R. Dabrowski, "Optimization of the display parameters of a room temperature twisted nematic display material by doping single-wall carbon nanotubes," Appl. Phys. Express 1, (2008) Art. ID 121501.

S. Y. Lu, L. C. Chien, "Carbon nanotube doped liquid crystal OCB mode: Physical and electro-optical properties," Opt. Express 16, 12777-12785 (2008).

2007

S. Y. Jeon, S. H. Shin, S. J. Jeong, S. H. Lee, S. H. Jeong, Y. H. Lee, H. C. Choi, K. J. Kim, "Effects of carbon nanotubes on electro-optical characteristics of liquid crystal cell driven by in-plane field," Appl. Phys. Lett. 90, (2007) Art. ID 121901.

H. Y. Chen, W. Lee, N. A. Clark, "Faster electro-optical response characteristics of a carbon-nanotube-nematic suspension," Appl. Phys. Lett. 90, (2007) Art. ID 033510.

2006

H. Y. Chen, W. Lee, "Suppression of field screening in nematic liquid crystals by carbon nanotubes," Appl. Phys. Lett. 88, (2006) Art. ID 222105.

2005

C. Y. Huang, C. Y. Hu, H. C. Pan, K. Y. Lo, "Electrooptical responses of carbon nanotube-doped liquid crystal devices," Jpn. J. Appl. Phys. 44, 8077-8081 (2005).

I. Dierking, G. Scalia, P. Morales, "Liquid crystal-carbon nanotube dispersions," J. Appl. Phys. 97, (2005) Art. ID 044309.

H. Y. Chen, W. Lee, "Electro-optical characteristics of a twisted nematic liquid-crystal cell doped with carbon nanotubes in a DC electric field," Opt. Rev. 12, 223-225 (2005).

2004

W. Lee, C. Y. Wang, Y. C. Shih, "Effects of carbon nanosolids on the electro-optical properties of a twisted nematic liquid-crystal host," Appl. Phys. Lett. 85, 513-515 (2004).

2002

J. Y. Hwang, Y. M. Jo, D. S. Seo, S. J. Rho, D. K. Lee, H. K. Baik, "Liquid crystal alignment capabilities on a new diamond-like carbon thin film layer," Jpn. J. Appl. Phys. 41, L654-L656 (2002).

2001

J. Stöhr, M. G. Samant, J. Luning, A. C. Callegari, P. Chaudhari, J. P. Doyle, J. A. Lacey, S. A. Lien, S. Purushothaman, J. L. Speidell, "Liquid crystal alignment on carbonaceous surfaces with orientational order," Science 292, 2299-2302 (2001).

W. Lee, C.-S. Chiu, "Observation of self-diffraction by gratings in nematic liquid crystals doped with carbon nanotubes," Opt. Lett. 26, 521-523 (2001).

1992

M. Schadt, K. Schmitt, V. Kozinkov, V. Chigrinov, "Surface-induced parallel alignment of liquid crystals by linearly polymerized photopolymers," Jpn. J. Appl. Phys. 31, 2155-2164 (1992).

1991

S. Iijima, "Helical microtubules of graphitic carbon," Nature 354, 56-58 (1991).

1987

J. M. Geary, J. W. Goodby, A. R. Kmetz, J. S. Patel, "The mechanism of polymer alignment of liquid crystal materials," J. Appl. Phys. 62, 4100-4108 (1987).

1972

D. W. Berreman, "Solid surface shape and the alignment of an adjacent nematic liquid crystal," Phys. Rev. Lett. 28, 1683-1686 (1972).

Appl. Phys. Express

R. Dhar, A. S. Pandey, M. B. Pandey, S. Kumar, R. Dabrowski, "Optimization of the display parameters of a room temperature twisted nematic display material by doping single-wall carbon nanotubes," Appl. Phys. Express 1, (2008) Art. ID 121501.

Appl. Phys. Lett.

S. Y. Jeon, S. H. Shin, S. J. Jeong, S. H. Lee, S. H. Jeong, Y. H. Lee, H. C. Choi, K. J. Kim, "Effects of carbon nanotubes on electro-optical characteristics of liquid crystal cell driven by in-plane field," Appl. Phys. Lett. 90, (2007) Art. ID 121901.

H. Y. Chen, W. Lee, N. A. Clark, "Faster electro-optical response characteristics of a carbon-nanotube-nematic suspension," Appl. Phys. Lett. 90, (2007) Art. ID 033510.

W. Lee, C. Y. Wang, Y. C. Shih, "Effects of carbon nanosolids on the electro-optical properties of a twisted nematic liquid-crystal host," Appl. Phys. Lett. 85, 513-515 (2004).

H. Y. Chen, W. Lee, "Suppression of field screening in nematic liquid crystals by carbon nanotubes," Appl. Phys. Lett. 88, (2006) Art. ID 222105.

J. Appl. Phys.

J. M. Geary, J. W. Goodby, A. R. Kmetz, J. S. Patel, "The mechanism of polymer alignment of liquid crystal materials," J. Appl. Phys. 62, 4100-4108 (1987).

B. Y. Oh, K. M. Lee, B. Y. Kim, Y. H. Kim, J. W. Han, J. M. Han, S. K. Lee, D. S. Seo, "Surface reformation and electro-optical characteristics of liquid crystal alignment layers using ion beam irradiation," J. Appl. Phys. 104, (2008) Art. ID 064502.

I. Dierking, G. Scalia, P. Morales, "Liquid crystal-carbon nanotube dispersions," J. Appl. Phys. 97, (2005) Art. ID 044309.

K. M. Lee, B. Y. Oh, Y. H. Kim, D. S. Seo, "Effect of ion beam irradiation and rubbing on the directional behavior and alignment mechanism of liquid crystals on polyimide surfaces," J. Appl. Phys. 105, (2009) Art. ID 014507.

Jpn. J. Appl. Phys.

C. Y. Lee, Y. L. Liu, K. Y. Wu, M. Y. Chen, J. C. Hwang, "Argon plasma beam scanning processes polyimide films for liquid crystal alignment," Jpn. J. Appl. Phys. 47, 226-230 (2008).

J. Y. Hwang, Y. M. Jo, D. S. Seo, S. J. Rho, D. K. Lee, H. K. Baik, "Liquid crystal alignment capabilities on a new diamond-like carbon thin film layer," Jpn. J. Appl. Phys. 41, L654-L656 (2002).

M. Schadt, K. Schmitt, V. Kozinkov, V. Chigrinov, "Surface-induced parallel alignment of liquid crystals by linearly polymerized photopolymers," Jpn. J. Appl. Phys. 31, 2155-2164 (1992).

C. Y. Huang, C. Y. Hu, H. C. Pan, K. Y. Lo, "Electrooptical responses of carbon nanotube-doped liquid crystal devices," Jpn. J. Appl. Phys. 44, 8077-8081 (2005).

Macromolecules

Y. S. Kwon, B. M. Jung, H. Lee, J. Y. Chang, "Preparation of polymeric SWNT-liquid crystal composites using a polymerizable surfactant," Macromolecules 43, 5376-5381 (2010).

Nature

S. Iijima, "Helical microtubules of graphitic carbon," Nature 354, 56-58 (1991).

Opt. Express

Opt. Lett.

Opt. Rev.

H. Y. Chen, W. Lee, "Electro-optical characteristics of a twisted nematic liquid-crystal cell doped with carbon nanotubes in a DC electric field," Opt. Rev. 12, 223-225 (2005).

Phys. Rev. Lett.

D. W. Berreman, "Solid surface shape and the alignment of an adjacent nematic liquid crystal," Phys. Rev. Lett. 28, 1683-1686 (1972).

Science

J. Stöhr, M. G. Samant, J. Luning, A. C. Callegari, P. Chaudhari, J. P. Doyle, J. A. Lacey, S. A. Lien, S. Purushothaman, J. L. Speidell, "Liquid crystal alignment on carbonaceous surfaces with orientational order," Science 292, 2299-2302 (2001).

Other

H. Birecki, F. J. Kahn, The Physics and Chemistry and Liquid Crystal Devices (Plenum, 1980) pp. 115.

T. Scheffer, J. Nehring, Liquid Crystals: Applications and Uses (World Scientific, 1990) pp. 232-251.

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