Evidence for a unique chain organization in long chain silane monolayers deposited on two widely different solid substrates

David L. Allara, Atul N. Parikh, Francis Rondelez

Research output: Contribution to journalArticle

267 Scopus citations

Abstract

We address the longstanding issue of substrate effects in alkylsiloxane monolayer self-assembly. With proper substrate prehydration, we observe formation of identical quality, compact, quasi-crystalline monolayers on oxidized silicon and gold substrates with widely different chemical character, the former capable of covalent bonding to the adsorbed molecules via silanol groups and the latter devoid of reactive surface sites. Infrared spectroscopy, ellipsometry, and wetting measurements show identical average film structures consisting of highly extended chains tilted at 10 (±2)° with significant end-gauche defect content. This observed substrate independence is consistent with our previous hypothesis that substrate-bound water promotes the decoupling of the organic film from the underlying solid surface.

Original languageEnglish (US)
Pages (from-to)2357-2360
Number of pages4
JournalLangmuir
Volume11
Issue number7
StatePublished - 1995
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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