Improved method for the preparation of carboxylic acid and amine terminated self-assembled monolayers of alkanethiolates

Hua Wang, Shengfu Chen, Lingyan Li, Shaoyi Jiang

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204 Scopus citations

Abstract

We present an improved method to prepare carboxylic acid (COOH) and amine (NH 2) terminated self-assembled monolayers (SAMs) of alkanethiolates. In this method, a small amount of CF 3COOH(for COOH-SAM) or N(CH 2CH 3) 3 (for NH 2-SAM) is added into the ethanolic solution of alkanethiols during SAM formation. The freshly formed COOH- and NH 2-SAMs are then rinsed with an ethanolic solution of NH 4OH or CH 3COOH, respectively. Both SAMs prepared with the improved method show better quality in terms of surface chemical composition, roughness, and wettability as measured by X-ray photoelectron spectroscopy, atomic force microscopy, and contact angle, respectively. The formation of better SAMs can be attributed to the disruption of interplane hydrogen bonds.

Original languageEnglish (US)
Pages (from-to)2633-2636
Number of pages4
JournalLangmuir
Volume21
Issue number7
DOIs
StatePublished - Mar 29 2005

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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