AVS 50th International Symposium
    Organic Films and Devices Tuesday Sessions
       Session OF-TuP

Paper OF-TuP3
Real Time Observation of Surface Stress during Dithiol Adsorption in Gas Phase

Tuesday, November 4, 2003, 5:30 pm, Room Hall A-C

Session: Poster Session
Presenter: A.N. Itakura, National Institute for Materials Science, Japan
Authors: A.N. Itakura, National Institute for Materials Science, Japan
R. Berger, Max Planck Institute for Polymer Research, Germany
S. Igarashi, Japan Science and Technology Corporation, Japan
M. Kitajima, National Institute for Materials Science, Japan
Correspondent: Click to Email
Self-assembled monolayers (SAM) such as alkanethiol, HS-(CH@sub2@)@sub n-1@-CH@sub 3@ for n=4,6,8,12, on Au induce compressive surface stresses during the self-assembly, and the saturation value of the stress is proportional to the length of alkyl chain.@footnote 1@ We observed the compressive stress for dithiol HS-(CH@sub2@)@sub n@-SH for n=6,8,10, adsorption on Au in gas phase. Contrary to the alkanethiol adsorption, the saturation value of the compressive stress showed smaller value for longer alkyl chain. The compressive stress for dithiol adsorption may be induced by the bonding between S and Au substrate. Dithiol adsorbes on Au surface as a lie-down phase, while alkanethiol as a standing phase. Density of the S-Au bonds should be lower for longer chain of dithiol, resulting in the reduction of the stress. @FootnoteText@ @footnote 1@ A.N.Itakura, R.Berger, T.Narushima and M.Kitajima, Appl.Phys.Lett.80, 3712 (2002)