Order-disorder transitions in self-assembled monolayers: A 13C solid-state NMR study

Wei Gao, Lucy Dickinson, Christina M. Grozinger, Frederick G. Morin, Linda Reven

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Abstract

The effect of the chain length and temperature on ordering of alkylphosphonate, (CnH2n+1)PO3H2, n = 8-18, monolayers on ZrO2 was characterized by solid-state 13C NMR. Alkylphosphonate monolayers with chain lengths of n < 16 are disordered at room temperature. C18 monolayers of thiols and phosphonates both show reversible chain melting at ∼50 °C. This chain length dependence, as well as variable-temperature spectra, demonstrates that the thermal stabilities of conformational order in phosphonate and thiol monolayers are similar. In general, the initial free volume in a self-assembled monolayer on a rough surface is large enough to allow reversible thermal disordering although the headgroup remains rigid.

Original languageEnglish (US)
JournalLangmuir
Volume13
Issue number2
StatePublished - Jan 22 1997

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All Science Journal Classification (ASJC) codes

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

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