Adsorption structure of phenylphosphonic acid on an alumina surface

Shinjiro Yagyu, Michiko Yoshitake, Nataliya Tsud, Toyohiro Chikyow

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The adsorption structure of phenylphosphonic acid (PPOA) on an alumina surface was investigated as a function of exposure and temperature using infrared reflected absorption spectroscopy (IRAS) and a Kelvin probe. The alumina surface was held at room temperature during deposition. At monolayer adsorption, P{single bond}O and Phenyl-P bands are observed, which indicate the creation of P{single bond}O{single bond}Al bonds. The aromatic ring plane is positioned perpendicular to the surface, i.e. deprotonated PPOA stands vertically on the surface. At multilayer adsorption, P{double bond, long}O and P{single bond}OH bands appear in the spectra. The multilayer PPOA film starts to desorb at 400 K. From 400 to 700 K, the IRAS spectra are similar to the monolayer spectrum, indicating that the multilayer structure reverses to the monolayer-like PPOA adlayer by heating. The acid molecules start to desorb at 700 K. Crown

Original languageEnglish
Pages (from-to)1140-1143
Number of pages4
JournalApplied Surface Science
Volume256
Issue number4
DOIs
Publication statusPublished - 2009 Nov 30
Externally publishedYes

Keywords

  • Adsorption
  • Alumina
  • Phenylphosphonic acid
  • Work function

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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