Accession Number:

ADA310644

Title:

Polymeric Self-Assembled Monolayers. 4. Synthesis, Characterization, and Stability of omega-Functionalized, Self-Assembled Diacetylenic and Polydiacetylenic Monolayers.

Descriptive Note:

Technical rept. 1 Jun 95-31 May 96,

Corporate Author:

TEXAS A AND M UNIV COLLEGE STATION DEPT OF CHEMISTRY

Report Date:

1996-06-24

Pagination or Media Count:

69.0

Abstract:

Here we discuss the preparation and characterization of photopolymerizable, self-assembled monolayers SAMs that consist of acid-, hydroxyl-, and methyl-terminated n-alkylthiois containing a diacetylene group HSCH 210C equivalent Ctriple bondsCCtriples bondsCCH210X XCOOH, CH2OH, and CH3, respectively. The acid and hydroxyl surfaces are readily amenable to further synthetic elaboration, while the methyl-terminated SAM results in a clean, low-energy surface. As demonstrated by Fourier transform infrared external reflectance spectroscopy FTIR-ERS, surface-enhanced Raman spectroscopy SERS, ellipsometry, UV-vis spectroscopy, and electrochemical methods, all three materials self assemble onto Au surface to form ordered monolayers that can be photopolymerized with UV light. The polymerized SAMs are extremely durable compared to simple n-alkanethiol SAMs. For example, they are stable to electrochemical cycling, thermal excursions to 200 deg C, and exposure to hot base 11 mixture of ethanol and 1.0 M aqueous KOH at 100 deg C. All of these conditions completely strip n-alkanethiol SAMs from Au substrates. These high-performance materials are suitable for applications in lubrication, adhesion, corrosion inhibition, and chemical sensing.

Subject Categories:

  • Polymer Chemistry
  • Organic Chemistry
  • Physical Chemistry
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE