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Self-Assembled Monolayers Derived from Bidentate Organosulfur Adsorbates

Published online by Cambridge University Press:  10 February 2011

Young-Seok Shon ,
Nupur Garg ,
Ramon Colorado Jr ,
Ramon J. Villazana  and
T. Randall Lee
Young-Seok Shon
Affiliation:
Department of Chemistry, University of Houston, Houston, TX 77204–5641, [email protected]
Nupur Garg
Affiliation:
Department of Chemistry, University of Houston, Houston, TX 77204–5641, [email protected]
Ramon Colorado Jr
Affiliation:
Department of Chemistry, University of Houston, Houston, TX 77204–5641, [email protected]
Ramon J. Villazana
Affiliation:
Department of Chemistry, University of Houston, Houston, TX 77204–5641, [email protected]
T. Randall Lee
Affiliation:
Department of Chemistry, University of Houston, Houston, TX 77204–5641, [email protected]
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Abstract

The adsorption of a series of 1,2-bis(mercaptomethyl)-4,5-dialkylbenzenes (1), spiroalkanedithiols (2), and aliphatic dithiocarboxylic acids (3) on gold yielded new types of self-assembled monolayers (SAMs). The new SAMs were characterized by optical ellipsometry, contact angle goniometry, and polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS). These results were compared to those obtained from SAMs derived from normal alkanethiols (4) of analogous chain length. Comparisons of ellipsometric thickness and contact angle wettability showed that the new SAMs were well packed and highly oriented. Comparisons of the PM-IRRAS data showed that the SAMs generated from 1 and 2 exhibited slightly less crystallinity than their alkanethiolate-based analogs, while the SAMs generated from 3 exhibited comparable crystallinity to their alkanethiolate-based analogs. Moreover, the SAMs derived from 1 and 2 showed no “odd-even” wettability or PM-IRRAS effects, while those derived from 3 showed remarkably large “odd-even” effects compared to those derived from normal alkanethiols.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 576: Symposium DD – Organic/Inorganic Hybrid Materials II , 1999 , 183
Copyright
Copyright © Materials Research Society 1999

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