Accession Number : ADA192977

Title :   Molecular-Level Control Over Surface Order in Self-Assembled Monolayer Films of Organic Thiols on Gold.

Descriptive Note : Interim rept.,

Corporate Author : HARVARD UNIV CAMBRIDGE MASS DEPT OF CHEMISTRY

Personal Author(s) : Bain, Colin D ; Whitesides, George M

PDF Url : ADA192977

Report Date : Mar 1988

Pagination or Media Count : 17

Abstract : Long-chain omega-hydroxyalkanethiols (HS(CH2)nOH) coordinate to gold surfaces through the sulphur atom and produce ordered, hydrophilic monolayers in which the hydroxyl groups are exposed at the outer surface. Coadsorption of two omega-hydroxyalkanethiols of different chain lengths, n, results in formation of a monolayer having a disordered surface region that is markedly less hydrophilic than the homogeneous, hydroxylic surface formed from either pure compound. By controlling the composition of the monolayer, it is also possible to control simultaneously the degree of order in the surface and its hydrophilicity. In the monolayers containing a mixture of alkanethiol components, these components apparently do not phase-segregate into macroscopic islands, but are dispersed on a molecular scale. Keywords: Gold, Wettability, Ellipsometry, Self assembly, Films.

Descriptors :   *THIOLS, *FILMS, ASSEMBLY, ATOMS, CHAINS, COORDINATES, ELLIPSOMETERS, EXTERNAL, GOLD, HYDROXYL RADICALS, LENGTH, MOLECULES, ORDER DISORDER TRANSFORMATIONS, PURITY, REGIONS, SCALE, SULFUR, SURFACES, WETTING

Subject Categories : Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE