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

Abstract

Self-assembled monolayers (SAMs) of a series of linear thiols containing a 1= thiaoligo(ethylene oxide) TOEO moiety, i.e., HS(CH2CH2O)(x)CH3, where x = 3 - 6, were prepared on polycrystalline gold (Au) and characterized by reflection absorption 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.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 2002
Accession Number
ADP014401

Entities

People

  • Curtis W. Meuse
  • David J. Vanderah
  • Hongly La
  • Jennifer Arsenault
  • Vitalii Silin

Organizations

  • National Institute of Standards and Technology

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Alkenes
  • Base Pressure
  • Biocompatible Materials
  • Biosensors
  • Ethylene Oxide
  • Ethylenes
  • Films
  • Magnetic Resonance
  • Mass Spectrometry
  • Materials
  • Measurement
  • Monomolecular Films
  • Nuclear Magnetic Resonance
  • Self Assembled Monolayers
  • Spectra
  • Spectroscopy
  • Standards

Readers

  • Electrochemical Surface Science
  • Materials Science and Engineering.
  • Polymer Science and Technology