Helical, Disordered, and What that Means: Structural Characterization of a New Series of Methyl 1-Thiaoligo(Ethylene Oxide) Self-Assembled Monolayers

Published

September 1, 2002

Author(s)

David J. Vanderah, J Arsenault, H La, Vitalii I. Silin, Curtis W. Meuse, Richard S. Gates

Abstract

Self-assembled monolayers (SAMs) of a series of linear thiols containing a 1-thiaoligo(ethylene oxide) [TOEO] moiety, i.e., HS(CH2CH2O)xCH3, where x = 3 - 6, were prepared on polycrystalline gold (Au) and characterized by reflection adsorption infrared spectroscopy (RAIRS) and spectroscopic ellipsometry (SE). For x = 5 and 6, the RAIRS data show that the TOEO segment, oriented normal to the substrate, adopts the highly ordered 7/2 helical structure of the folded-chain crystal polymorph of poly(ethylene oxide). For x = 3 and 4, the RAIRS and SE data indicate disordered, amorphous SAMs with essentially no evidence of the helical conformation in the TOEO segment. These data suggest that, for SAMs with TOEO segments, a minimum of five ethylene oxide units is required to adopt a helical conformation.

Proceedings Title

Materials Research Society Symposium Proceedings, Biological Biomimetic Materials: Properties to Function

Volume

724

Conference Dates

April 1-5, 2002

Conference Location

San Francisco, CA

Conference Title

Symposium on Biological and Biomimetic Materials: Properties to Function (held at the 2002 MRS Spring Meeting)

Pub Type

Conferences

Keywords

self assembeled monolayers

Citation

Ross, D. , Arsenault, J. , La, H. , Silin, V. , Meuse, C. and Gates, R. (2002), Helical, Disordered, and What that Means: Structural Characterization of a New Series of Methyl 1-Thiaoligo(Ethylene Oxide) Self-Assembled Monolayers, Materials Research Society Symposium Proceedings, Biological Biomimetic Materials: Properties to Function, San Francisco, CA (Accessed April 28, 2024)