Gold nanoparticles deposited on SiO2/Si(100)

Correlation between size, electron structure, and activity in CO oxidation

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Abstract

Nanosize gold particles were prepared by Ar+ ion implantation of 10-nm thick gold film deposited onto a SiO2/Si(100) wafer possessing no catalytic activity in the CO oxidation. Along with size reduction the valence band of the gold particles and the actual size were determined by ultraviolet- and X-ray photoelectron spectroscopy (UPS, XPS) and by transmission electron microscopy (TEM) as well as atomic force microscopy (AFM), respectively. The catalytic activity was determined in the CO oxidation. Energy distribution of the photoelectrons excited from 5d valence band of gold was strongly affected by Ar+ implantation. This variation was interpreted by the redistribution of the valence band density of states (DOS). The intrinsic catalytic activity of the gold particles increased with decreasing size. When an Au/FeOx interface was created by FeOx deposition on large gold nanoparticles, a significant increase in the rate of the CO oxidation was observed. These data can be regarded as an experimental verification of the correlation between the catalytic activity and valence band density of states of gold.

Original languageEnglish
Pages (from-to)4332-4337
Number of pages6
JournalJournal of the American Chemical Society
Volume125
Issue number14
DOIs
Publication statusPublished - Apr 9 2003

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Carbon Monoxide
Gold
Nanoparticles
Electrons
Oxidation
Valence bands
Catalyst activity
X ray photoelectron spectroscopy
Photoelectron Spectroscopy
Atomic Force Microscopy
Ultraviolet Rays
Photoelectrons
Transmission Electron Microscopy
Particle Size
Ion implantation
Atomic force microscopy
Ions
Transmission electron microscopy

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

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title = "Gold nanoparticles deposited on SiO2/Si(100): Correlation between size, electron structure, and activity in CO oxidation",
abstract = "Nanosize gold particles were prepared by Ar+ ion implantation of 10-nm thick gold film deposited onto a SiO2/Si(100) wafer possessing no catalytic activity in the CO oxidation. Along with size reduction the valence band of the gold particles and the actual size were determined by ultraviolet- and X-ray photoelectron spectroscopy (UPS, XPS) and by transmission electron microscopy (TEM) as well as atomic force microscopy (AFM), respectively. The catalytic activity was determined in the CO oxidation. Energy distribution of the photoelectrons excited from 5d valence band of gold was strongly affected by Ar+ implantation. This variation was interpreted by the redistribution of the valence band density of states (DOS). The intrinsic catalytic activity of the gold particles increased with decreasing size. When an Au/FeOx interface was created by FeOx deposition on large gold nanoparticles, a significant increase in the rate of the CO oxidation was observed. These data can be regarded as an experimental verification of the correlation between the catalytic activity and valence band density of states of gold.",
author = "L. Guczi and G. Pető and A. Beck and K. Frey and O. Geszti and G. Moln{\'a}r and Csaba Dar{\'o}czi",
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T1 - Gold nanoparticles deposited on SiO2/Si(100)

T2 - Correlation between size, electron structure, and activity in CO oxidation

AU - Guczi, L.

AU - Pető, G.

AU - Beck, A.

AU - Frey, K.

AU - Geszti, O.

AU - Molnár, G.

AU - Daróczi, Csaba

PY - 2003/4/9

Y1 - 2003/4/9

N2 - Nanosize gold particles were prepared by Ar+ ion implantation of 10-nm thick gold film deposited onto a SiO2/Si(100) wafer possessing no catalytic activity in the CO oxidation. Along with size reduction the valence band of the gold particles and the actual size were determined by ultraviolet- and X-ray photoelectron spectroscopy (UPS, XPS) and by transmission electron microscopy (TEM) as well as atomic force microscopy (AFM), respectively. The catalytic activity was determined in the CO oxidation. Energy distribution of the photoelectrons excited from 5d valence band of gold was strongly affected by Ar+ implantation. This variation was interpreted by the redistribution of the valence band density of states (DOS). The intrinsic catalytic activity of the gold particles increased with decreasing size. When an Au/FeOx interface was created by FeOx deposition on large gold nanoparticles, a significant increase in the rate of the CO oxidation was observed. These data can be regarded as an experimental verification of the correlation between the catalytic activity and valence band density of states of gold.

AB - Nanosize gold particles were prepared by Ar+ ion implantation of 10-nm thick gold film deposited onto a SiO2/Si(100) wafer possessing no catalytic activity in the CO oxidation. Along with size reduction the valence band of the gold particles and the actual size were determined by ultraviolet- and X-ray photoelectron spectroscopy (UPS, XPS) and by transmission electron microscopy (TEM) as well as atomic force microscopy (AFM), respectively. The catalytic activity was determined in the CO oxidation. Energy distribution of the photoelectrons excited from 5d valence band of gold was strongly affected by Ar+ implantation. This variation was interpreted by the redistribution of the valence band density of states (DOS). The intrinsic catalytic activity of the gold particles increased with decreasing size. When an Au/FeOx interface was created by FeOx deposition on large gold nanoparticles, a significant increase in the rate of the CO oxidation was observed. These data can be regarded as an experimental verification of the correlation between the catalytic activity and valence band density of states of gold.

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