Investigation of Single Monolayer Formation of the Evaporated Liquid Crystalline Molecules by the Surface Potential Measurement

Takaaki MANAKA  Hajime HIGA  Dai NAKAMURA  Dai TAGUCHI  Mitsumasa IWAMOTO  

IEICE TRANSACTIONS on Electronics   Vol.E87-C   No.2   pp.183-184
Publication Date: 2004/02/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Recent Progress of Organic Molecular Electronics)
Category: Nano-interface Controlled Electronic Devices
surface potential,  liquid crystal,  monolayer,  

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The formation of single monolayer of liquid crystalline molecules, 4-n-pentyl-4-cyanobiphenyl (5CB), deposited by the evaporation method in the air, was confirmed with the surface potential measurement. The surface potential increased with the time of evaporation, and the 3- or 4-minute evaporation at a source temperature of 110 gave the saturated potential, indicating the formation of single monolayer. Single monolayer formation was also supported by the comparison of the UV-visible absorption for evaporated film with LB monolayer. Positive potentials were built at the surface, indicating that CN group faces the substrate.