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Proceedings Paper

Self-assembling of molecular nanowires for enhancing the conducting properties of discotic liquid crystals
Author(s): Ji Hyun Park; Kyung Ho Kim; Yoichi Takanishi; Jun Yamamoto; Yung Woo Park; Youn Sang Kim; Giusy Scalia
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Paper Abstract

The self-organization of discotic liquid crystal molecules in columns has enormous interest for soft nanoelectronic applications. A great advantage of discotic liquid crystal is that defects can be self-annealed in contrast to typical organic materials. Through the overlap of molecular orbitals, the aromatic cores assemble into long range ordered one-dimensional structures. Very thin structured films can be obtained by spin-coating from solution and the resulting morphologies are strongly dependent on the interaction between discotics and solvent molecules. Toluene produces films formed by very long nanowires, spontaneously aligned along a common direction and over fairly large areas. These nanostructured films are a result of the interplay between liquid crystal self-organization and solvent driven assembly. The ordered nanowire structures exhibit improvement in the electrical properties compared to misaligned structures and even to pristine HAT5, deposited without the aid of solvent. In this study we show that the toluene-based deposition of discotic liquid crystals is advantageous because it allows a uniform coverage of the substrate, unlike pristine HAT5 but also thanks to the type of induced structures exhibiting one order of magnitude higher conductivity, in the aligned nanowire films, compared to bare HAT5 ones.

Paper Details

Date Published: 20 August 2015
PDF: 7 pages
Proc. SPIE 9558, Nanostructured Thin Films VIII, 95580R (20 August 2015); doi: 10.1117/12.2188078
Show Author Affiliations
Ji Hyun Park, Seoul National Univ. (Korea, Republic of)
Kyung Ho Kim, Seoul National Univ. (Korea, Republic of)
Yoichi Takanishi, Kyoto Univ. (Japan)
Jun Yamamoto, Kyoto Univ. (Japan)
Yung Woo Park, Seoul National Univ. (Korea, Republic of)
Youn Sang Kim, Seoul National Univ. (Korea, Republic of)
Giusy Scalia, Seoul National Univ. (Korea, Republic of)
Univ. du Luxembourg (Luxembourg)

Published in SPIE Proceedings Vol. 9558:
Nanostructured Thin Films VIII
Akhlesh Lakhtakia; Tom G. Mackay; Motofumi Suzuki, Editor(s)

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