Accession Number:

ADA229263

Title:

Formation of Monolayer Films by the Spontaneous Assembly of Organic Thiols from Solution onto Gold

Descriptive Note:

Interim rept. 1 Sep 1985-31 Aug 1988,

Corporate Author:

HARVARD UNIV CAMBRIDGE MA DEPT OF CHEMISTRY

Report Date:

1988-09-01

Pagination or Media Count:

95.0

Abstract:

Long-chain alkanethiols, HSCH2nX, adsorb from solution onto gold surfaces and form ordered, oriented monolayer films. The properties of the interfaces between the films and liquids are largely independent of chain length when n 10 in particular, wetting is not directly influenced by the proximity of the underlying gold substrate. The specific interaction of gold with sulfur and other soft nucleophiles and its low reactivity toward most hard acids and bases make it possible to vary the structure of the terminal group, X, widely and thus permit the introduction of a great range of functional groups into a surface. Studies of wettability of these monolayers, and of their composition using X-ray photoelectron spectroscopy XPS, indicate that the monolayers are oriented with the tail group, X, exposed at the monolayer-air or monolayer-liquid interface. The adsorption of simple n-alkanethiols generates hydrophobic surfaces whose free energy 19 mJ sq m is the lowest of any hydrocarbon surface studied to date. TTL

Subject Categories:

  • Organic Chemistry
  • Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE