Adsorption structure of phenylphosphonic acid on an alumina surface

Shinjiro Yagyu; Michiko Yoshitake; Nataliya Tsud; Toyohiro Chikyow

doi:10.1016/j.apsusc.2009.05.110

Adsorption structure of phenylphosphonic acid on an alumina surface

Shinjiro Yagyu, Michiko Yoshitake, Nataliya Tsud, Toyohiro Chikyow

Research output: Contribution to journal › Article › peer-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 language	English
Pages (from-to)	1140-1143
Number of pages	4
Journal	Applied Surface Science
Volume	256
Issue number	4
DOIs	https://doi.org/10.1016/j.apsusc.2009.05.110
Publication status	Published - 2009 Nov 30
Externally published	Yes

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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title = "Adsorption structure of phenylphosphonic acid on an alumina surface",

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",

keywords = "Adsorption, Alumina, Phenylphosphonic acid, Work function",

author = "Shinjiro Yagyu and Michiko Yoshitake and Nataliya Tsud and Toyohiro Chikyow",

year = "2009",

month = nov,

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T1 - Adsorption structure of phenylphosphonic acid on an alumina surface

AU - Yagyu, Shinjiro

AU - Yoshitake, Michiko

AU - Tsud, Nataliya

AU - Chikyow, Toyohiro

PY - 2009/11/30

Y1 - 2009/11/30

N2 - 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

AB - 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

KW - Adsorption

KW - Alumina

KW - Phenylphosphonic acid

KW - Work function

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