Ion-beam induced liquid crystal alignment on diamond-like carbon and fluorinated diamond-like carbon thin films

被引：51

作者：

Ahn, HJ

Rho, SJ

Kim, KC

Kim, JB

Hwang, BH

Park, CJ

Baik, HK

机构：

[1] Yonsei Univ, Dept Met Engn, Seoul 120749, South Korea

[2] Yonsei Univ, Dept Elect & Elect Engn, Seoul 120749, South Korea

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 2005年 / 44卷 / 6A期

关键词：

DLC; FDLC; alignment layer; liquid crystal; ion beam irradiation; hydrophobic; surface energy; sp(2) fraction;

D O I：

10.1143/JJAP.44.4092

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Homogeneous and homeotropic orientations of nematic liquid crystal (NLC) are investigated on various inorganic thin films which are exposed to Ar ion-beam. It is the novel investigations which results in a completely dry processing technique for both the thin film deposition and alignment steps. In the case of homogenous alignment on diamond-like carbon (DLC) layer, optical band gap and the polar surface energy are investigated in order to elucidate the alignment mechanism by ion beam (113) irradiation. We elucidate the role of surface polarity in DLC films with respect to the LC orientation. On the other hand, FDLC thin films are selected by homeotropic alignment layer with regard to the relationship between surface tension and LC orientation. Selected pretilt angles in the range of 71.1-89.8 degrees can be easily obtained with ion beam irradiation. It is sensitively changed by thin films composition and the angle of ion beam irradiation.

引用

页码：4092 / 4097

页数：6

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