[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.4313/TEEM.2007.8.1.046

Liquid Crystal Alignment Effects on Nitrogen-doped Diamond like Carbon Layer by Ion Beam Alignment Method

Han, Jeong-Min (Department of Electrical & Electronic Engineering(C-724), College of Engineering, Yonsei University)
Choi, Sung-Ho (Department of Electrical & Electronic Engineering(C-724), College of Engineering, Yonsei University)
Kim, Byoung-Yong (Department of Electrical & Electronic Engineering(C-724), College of Engineering, Yonsei University)
Han, Jin-Woo (Department of Electrical & Electronic Engineering(C-724), College of Engineering, Yonsei University)
Kim, Jong-Hwan (Department of Electrical & Electronic Engineering(C-724), College of Engineering, Yonsei University)
Kim, Young-Hwan (Department of Electrical & Electronic Engineering(C-724), College of Engineering, Yonsei University)
Hwang, Jeoung-Yeon (Department of Electrical & Electronic Engineering(C-724), College of Engineering, Yonsei University)
Lee, Sang-Keuk (Department of Electrical & Electronic Engineering(C-724), College of Engineering, Yonsei University)
Ok, Chul-Ho (Department of Electrical & Electronic Engineering(C-724), College of Engineering, Yonsei University)
Seo, Dae-Shik (Department of Electrical & Electronic Engineering(C-724), College of Engineering, Yonsei University)

Publication Information

Transactions on Electrical and Electronic Materials / v.8, no.1, 2007 , pp. 46-50 More about this Journal

Abstract

We have studied the nematic liquid crystal (NLC) alignment effects on a nitrogen-doped diamond-like carbon (NDLC) thin film layer with ion beam irradiation. The pretilt angle for NLC on the NDLC surface with ion beam exposure was observed below 1 degree. Also, we had the good LC alignment characteristics on the NDLC thin films with ion beam exposure of 1800 eV. In thermal stability experiments, the alignment defect of the NLC on the NDLC surface with ion beam irradiation above annealing temperature of $250^{\circ}C$ can be observed. Therefore, the good thermal stability and LC alignment for NLC by ion beam aligned NDLC thin films can be achieved.

Keywords

NDLC; Ion beam exposure; Alignment; PECVD; Nematic liquid crystal;

Citations & Related Records

Reference

1	D.-S. Seo, K. Muroi, and S. Kobayashi, 'Generation of pretilt angle in nematic liquid crystal, 5CB, media aligned polyimide ilms prepared by spin-coating and LB techniques: effect of rubbing', Mol. Cryst. Liq. Cryst., Vol. 213, p. 223, 1992
2	J. M. Geary, J. W. Goodby, A. R. Kmetz, and J. S. Patel, 'The mechanism of polymer alignment of liquid-crystal materials', J. Appl. Phys., Vol. 62, p. 4100, 1987
3	D.-S. Seo, S. Kobayashi, and M. Nishikawa, 'Temperature dependence of the polar anchoring strength of weakly rubbed polyimide films for nematic liquid crystal (5CB)', Appl. Phys. Lett., Vol. 61, p. 2392, 1992
4	S. F. Jiang and G. J. Wang, 'Development of ion sources for fusion research at swip', Rev. Sci. Instrum., Vol. 65, No. 4, 1994
5	J. Stohr, M. G. Samant, J. Luning, A. C. Callegari, P. Chaudhari, J. P. Doyle, J. A. Lacey, S. A. Lien, S. Purushothaman, and J. L. Speidell, 'Liquid crystal alignment on carbonaceous surfaces with orientational order', Science, Vol. 292, p. 2299, 2001
6	A. M. Ektessabi and S. Hakamata, 'XPS study of ion beam modified polyimide films', Thin Solid Fims, Vol. 377, p. 621, 2000
7	Y.-M. Jo, J.-Y. Hwang, S.-K. Lee, and D.-S. Seo, 'Alignment effects for nematic liquid crystal on a new diamond-like carbon layer', Trans. EEM, Vol. 3, No. 2, p. 1, 2002
8	J.-Y. Hwang, C.-J. Park, S.-J. Roh, H.-K. Baik, and D.-S. Seo, 'Liquid crystal alignment effects using a-C:H thin films deposited as rf bias Condition', Ferroelectrics, Vol. 310, p. 63, 2004 DOI ScienceOn
9	C.-J. Park, H.-K. Kang, J.-Y. Hwang, H.-J Ahn, K.C. Kim, J.-B. Kim, H.-K. Baik; and D.-S. Seo, 'The alignment effect of nematic liquid crystal on NDLC thin films surface', Mol. Cryst. Liq. Cryst., Vol. 434, p. 163, 2005 DOI
10	J.-Y. Hwang, Y.-M. Jo, and D.-S. Seo, 'A study on liquid crystal alignment effects by UV alignment method on a diamond-like-carbon thin film surface', J. of KIEEME(in Korean), Vol. 16, No.3, p. 214, 2003