title: On the self assembly of short chain alkanedithiols.
abstract: A study of the self-assembly of nonane-alkanedithiol monolayers on gold in n-hexane and ethanol solvents is presented. Self-assembled monolayers (SAMs) are characterised by reflection-absorption infrared spectroscopy (RAIRS), sum frequency generation (SFG) and spectroscopic ellipsometry (SE) measurements. Data obtained for alkanethiols SAMs are also shown for comparison. The measurements show that nicely organized HSC9SH SAMs can be obtained in n-hexane provided that N2-degassed solutions are used and all preparation steps are performed in the absence of ambient light. SFG measurements show that these SAMs have free standing SH groups. Use of an un-degassed and/or light-exposed n-hexane solutions leads to a worse layer organization. Preparation in ethanol, even in degassed solutions with processing in the dark, leads to poorly organized layers and no sign of free -SH groups was observed.
authors.affiliation: Université-Paris Sud, Laboratoire des Collisions Atomiques et Moléculaires, LCAM, Bâtiment, 351, UPS-11, 91405, Orsay, France.
authors.forename: Hicham
authors.initials: H
authors.lastname: Hamoudi
authors.forename: Zhiang
authors.initials: Z
authors.lastname: Guo
authors.forename: Mirko
authors.initials: M
authors.lastname: Prato
authors.forename: Céline
authors.initials: C
authors.lastname: Dablemont
authors.forename: Wan Quan
authors.initials: WQ
authors.lastname: Zheng
authors.forename: Bernard
authors.initials: B
authors.lastname: Bourguignon
authors.forename: Maurizio
authors.initials: M
authors.lastname: Canepa
authors.forename: Vladimir A
authors.initials: VA
authors.lastname: Esaulov