Valence band and catalytic activity of Au nanoparticles in Fe2O3/SiO2/Si(100) environment

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Abstract

A 10-nm-thick gold film was evaporated onto a SiO2/Si(100) substrate and was implanted by Ar+ ions at 40 keV and 1015 at/cm2 dose creating island like Au nanoparticles. An 80-nm-thick gold film was also deposited the onto same substrate and considered as reference.Fe2O3 film was deposited onto the gold nanoparticles and the gold/oxide interface was modeled. The valence band and the structure were measured by means of photoelectron spectroscopy (XPS) and by transmission electron microscopy (TEM), respectively. The catalytic activity was detected by CO oxidation, which was higher after the deposition of Fe2O3 layer onto Au nanoparticles than that on a continuous Au film. This observation was correlated to the nanosize and the redistributed valence band density of states of gold in the Au/Fe2O3 interface.

Original languageEnglish
Pages (from-to)733-736
Number of pages4
JournalMaterials Science and Engineering C
Volume23
Issue number6-8
DOIs
Publication statusPublished - Dec 15 2003

Fingerprint

Valence bands
Gold
catalytic activity
Catalyst activity
gold
Nanoparticles
valence
nanoparticles
Substrates
Carbon Monoxide
Photoelectron spectroscopy
Oxides
X ray photoelectron spectroscopy
photoelectron spectroscopy
Ions
Transmission electron microscopy
dosage
Oxidation
transmission electron microscopy
oxidation

Keywords

  • Catalytic activity
  • Nanoparticles
  • Valence band

ASJC Scopus subject areas

  • Biomaterials

Cite this

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title = "Valence band and catalytic activity of Au nanoparticles in Fe2O3/SiO2/Si(100) environment",
abstract = "A 10-nm-thick gold film was evaporated onto a SiO2/Si(100) substrate and was implanted by Ar+ ions at 40 keV and 1015 at/cm2 dose creating island like Au nanoparticles. An 80-nm-thick gold film was also deposited the onto same substrate and considered as reference.Fe2O3 film was deposited onto the gold nanoparticles and the gold/oxide interface was modeled. The valence band and the structure were measured by means of photoelectron spectroscopy (XPS) and by transmission electron microscopy (TEM), respectively. The catalytic activity was detected by CO oxidation, which was higher after the deposition of Fe2O3 layer onto Au nanoparticles than that on a continuous Au film. This observation was correlated to the nanosize and the redistributed valence band density of states of gold in the Au/Fe2O3 interface.",
keywords = "Catalytic activity, Nanoparticles, Valence band",
author = "G. Pető and O. Geszti and G. Moln{\'a}r and Dar{\'o}czi, {Cs S.} and A. Karacs and L. Guczi and A. Beck and K. Frey",
year = "2003",
month = "12",
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T1 - Valence band and catalytic activity of Au nanoparticles in Fe2O3/SiO2/Si(100) environment

AU - Pető, G.

AU - Geszti, O.

AU - Molnár, G.

AU - Daróczi, Cs S.

AU - Karacs, A.

AU - Guczi, L.

AU - Beck, A.

AU - Frey, K.

PY - 2003/12/15

Y1 - 2003/12/15

N2 - A 10-nm-thick gold film was evaporated onto a SiO2/Si(100) substrate and was implanted by Ar+ ions at 40 keV and 1015 at/cm2 dose creating island like Au nanoparticles. An 80-nm-thick gold film was also deposited the onto same substrate and considered as reference.Fe2O3 film was deposited onto the gold nanoparticles and the gold/oxide interface was modeled. The valence band and the structure were measured by means of photoelectron spectroscopy (XPS) and by transmission electron microscopy (TEM), respectively. The catalytic activity was detected by CO oxidation, which was higher after the deposition of Fe2O3 layer onto Au nanoparticles than that on a continuous Au film. This observation was correlated to the nanosize and the redistributed valence band density of states of gold in the Au/Fe2O3 interface.

AB - A 10-nm-thick gold film was evaporated onto a SiO2/Si(100) substrate and was implanted by Ar+ ions at 40 keV and 1015 at/cm2 dose creating island like Au nanoparticles. An 80-nm-thick gold film was also deposited the onto same substrate and considered as reference.Fe2O3 film was deposited onto the gold nanoparticles and the gold/oxide interface was modeled. The valence band and the structure were measured by means of photoelectron spectroscopy (XPS) and by transmission electron microscopy (TEM), respectively. The catalytic activity was detected by CO oxidation, which was higher after the deposition of Fe2O3 layer onto Au nanoparticles than that on a continuous Au film. This observation was correlated to the nanosize and the redistributed valence band density of states of gold in the Au/Fe2O3 interface.

KW - Catalytic activity

KW - Nanoparticles

KW - Valence band

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