An epitaxial organic film. The self-assembled monolayer of docosanoic acid on silver(111)

Docosanoic acid in solution spontaneously forms an ordered self-assembled (SA) monolayer on the silver(111) surface, exposing methyl groups to the atmosphere. The contact wetting angles for water and hexadecane are 116[degrees] and 55[degrees], respectively. Surface X-ray diffraction shows that the...

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Bibliographic Details
Published in:Langmuir 1993-04, Vol.9 (4), p.1082-1085
Main Authors: Samant, Mahesh G, Brown, Charles A, Gordon, Joseph G
Format: Article
Language:English
Subjects:
360601 - Other Materials- Preparation & Manufacture
360602 - Other Materials- Structure & Phase Studies
400201 - Chemical & Physicochemical Properties
ADSORPTION
ALKANES
CARBOXYLIC ACIDS
Chemistry
COHERENT SCATTERING
DIFFRACTION
DISPERSIONS
ELEMENTS
Exact sciences and technology
General and physical chemistry
HEXADECANE
HYDROCARBONS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
MATERIALS SCIENCE
METALS
MIXTURES
MOLECULAR STRUCTURE
ORGANIC ACIDS
ORGANIC COMPOUNDS
SCATTERING
SILVER
Solid-liquid interface
SOLUTIONS
SORPTION
Surface physical chemistry
TRANSITION ELEMENTS
X-RAY DIFFRACTION
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Summary:Docosanoic acid in solution spontaneously forms an ordered self-assembled (SA) monolayer on the silver(111) surface, exposing methyl groups to the atmosphere. The contact wetting angles for water and hexadecane are 116[degrees] and 55[degrees], respectively. Surface X-ray diffraction shows that the in-plane structure of the SA monolayer is p(2 [times] 2). The SA monolayer is present in domains of about 215 A with a mosaic spread of 0.85[degrees]C. The chains within the monolayer are titled at 27 [+-] 1[degrees] from the surface normal toward the near neighbors. We conclude that the carboxylate group is bound nearly normal to specific sites on the Ag surface and that this determines the interchain spacing. The tilt angle is a consequence of this interchain spacing. 17 refs., 6 figs., 1 tab.
ISSN:0743-7463
1520-5827
DOI:10.1021/la00028a033