Comparison of the chemical properties of the zinc-polar, the oxygen-polar, and the nonpolar surfaces of ZnO

S. Akhter, K. Lui, Harold H Kung

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Abstract

The temperature programmed decomposition results of methanol, formaldehyde, and formic acid on an O-polar (0001) surface of ZnO are presented. From these results, and similar ones for the Zn-polar (0001) and the nonpolar (1010) and (5051) surfaces, a comparison of the properties of the different ZnO surfaces are made. Oxygen-containing molecules that possess strong dipole moments, such as alcohols, formaldehyde, acetone, and formic acid, interact most strongly with the Zn-polar face, less strongly with the nonpolar face, and least strongly with the O-polar face. This leads to the observed differences in the desorption temperature of molecular desorption, temperature of evolution of the decomposition products, and the fraction of methanol decomposed. These differences are explained by the different magnitudes and orientations of surface dipole moments, a different degree of ionicity of the surface Zn ions, and a different degree of steric hindrance of surface Zn ions for the different surfaces. Desorption of other molecules, such as propene and CO, whose adsorption is dominated by different types of interaction than the alcohols and aldehydes, shows different dependence on the surface structure.

Original languageEnglish
Pages (from-to)1958-1964
Number of pages7
JournalJournal of Physical Chemistry
Volume89
Issue number10
Publication statusPublished - 1985

Fingerprint

chemical properties
Chemical properties
Zinc
zinc
formic acid
Oxygen
oxygen
acids
Desorption
Formic acid
Dipole moment
desorption
Formaldehyde
Methanol
formaldehyde
Alcohols
dipole moments
alcohols
Ions
methyl alcohol

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Comparison of the chemical properties of the zinc-polar, the oxygen-polar, and the nonpolar surfaces of ZnO. / Akhter, S.; Lui, K.; Kung, Harold H.

In: Journal of Physical Chemistry, Vol. 89, No. 10, 1985, p. 1958-1964.

Research output: Contribution to journalArticle

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N2 - The temperature programmed decomposition results of methanol, formaldehyde, and formic acid on an O-polar (0001) surface of ZnO are presented. From these results, and similar ones for the Zn-polar (0001) and the nonpolar (1010) and (5051) surfaces, a comparison of the properties of the different ZnO surfaces are made. Oxygen-containing molecules that possess strong dipole moments, such as alcohols, formaldehyde, acetone, and formic acid, interact most strongly with the Zn-polar face, less strongly with the nonpolar face, and least strongly with the O-polar face. This leads to the observed differences in the desorption temperature of molecular desorption, temperature of evolution of the decomposition products, and the fraction of methanol decomposed. These differences are explained by the different magnitudes and orientations of surface dipole moments, a different degree of ionicity of the surface Zn ions, and a different degree of steric hindrance of surface Zn ions for the different surfaces. Desorption of other molecules, such as propene and CO, whose adsorption is dominated by different types of interaction than the alcohols and aldehydes, shows different dependence on the surface structure.

AB - The temperature programmed decomposition results of methanol, formaldehyde, and formic acid on an O-polar (0001) surface of ZnO are presented. From these results, and similar ones for the Zn-polar (0001) and the nonpolar (1010) and (5051) surfaces, a comparison of the properties of the different ZnO surfaces are made. Oxygen-containing molecules that possess strong dipole moments, such as alcohols, formaldehyde, acetone, and formic acid, interact most strongly with the Zn-polar face, less strongly with the nonpolar face, and least strongly with the O-polar face. This leads to the observed differences in the desorption temperature of molecular desorption, temperature of evolution of the decomposition products, and the fraction of methanol decomposed. These differences are explained by the different magnitudes and orientations of surface dipole moments, a different degree of ionicity of the surface Zn ions, and a different degree of steric hindrance of surface Zn ions for the different surfaces. Desorption of other molecules, such as propene and CO, whose adsorption is dominated by different types of interaction than the alcohols and aldehydes, shows different dependence on the surface structure.

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