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Gold Oxide Nanoparticles with Variable Gold Oxidation State

Tchaplyguine, Maxim LU ; Mikkelä, Mikko-Heikki LU ; Zhang, Chaofan; Andersson, Tomas and Bjorneholm, Olle (2015) In Journal of Physical Chemistry C 119(16). p.8937-8943
Abstract
Gold-oxide-containing nanoparticles have been produced in a range of partial to full oxidation conditions, where the nanoparticle electronic structure and stoichiometry have been characterized. Our results indicate that with the increase of the oxidation degree in these nanoparticles the gold oxidation state possibly changes from lower oxides with monoor divalent metal to the higher oxide with the trivalent gold. At intermediate oxidation conditions our observations are consistent with a radially segregated structure of such nanopaiticles-with the core containing mainly oxide and the surface covered with few monolayers of metallic gold. These results have been possible to obtain combining the vapor aggregation method for the nanoparticle... (More)
Gold-oxide-containing nanoparticles have been produced in a range of partial to full oxidation conditions, where the nanoparticle electronic structure and stoichiometry have been characterized. Our results indicate that with the increase of the oxidation degree in these nanoparticles the gold oxidation state possibly changes from lower oxides with monoor divalent metal to the higher oxide with the trivalent gold. At intermediate oxidation conditions our observations are consistent with a radially segregated structure of such nanopaiticles-with the core containing mainly oxide and the surface covered with few monolayers of metallic gold. These results have been possible to obtain combining the vapor aggregation method for the nanoparticle fabrication and synchrotron-based photoelectron spectroscopy for their characterization. The deposition of the oxidized nanoparticles has showed that the species assigned as containing lower oxide could be preserved in the landing and then studied on a substrate for a limited time. The possible lower oxide formation in nanoparticles is discussed in connection to the enhanced catalytic activity of gold nanoparticles. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
119
issue
16
pages
8937 - 8943
publisher
The American Chemical Society
external identifiers
  • wos:000353603500059
  • scopus:84928485580
ISSN
1932-7447
DOI
10.1021/acs.jpcc.5b00811
language
English
LU publication?
yes
id
bbd57aa1-a1fd-484d-99cb-d87fc9a2ccbb (old id 7432613)
date added to LUP
2015-06-25 10:03:03
date last changed
2017-10-01 03:33:43
@article{bbd57aa1-a1fd-484d-99cb-d87fc9a2ccbb,
  abstract     = {Gold-oxide-containing nanoparticles have been produced in a range of partial to full oxidation conditions, where the nanoparticle electronic structure and stoichiometry have been characterized. Our results indicate that with the increase of the oxidation degree in these nanoparticles the gold oxidation state possibly changes from lower oxides with monoor divalent metal to the higher oxide with the trivalent gold. At intermediate oxidation conditions our observations are consistent with a radially segregated structure of such nanopaiticles-with the core containing mainly oxide and the surface covered with few monolayers of metallic gold. These results have been possible to obtain combining the vapor aggregation method for the nanoparticle fabrication and synchrotron-based photoelectron spectroscopy for their characterization. The deposition of the oxidized nanoparticles has showed that the species assigned as containing lower oxide could be preserved in the landing and then studied on a substrate for a limited time. The possible lower oxide formation in nanoparticles is discussed in connection to the enhanced catalytic activity of gold nanoparticles.},
  author       = {Tchaplyguine, Maxim and Mikkelä, Mikko-Heikki and Zhang, Chaofan and Andersson, Tomas and Bjorneholm, Olle},
  issn         = {1932-7447},
  language     = {eng},
  number       = {16},
  pages        = {8937--8943},
  publisher    = {The American Chemical Society},
  series       = {Journal of Physical Chemistry C},
  title        = {Gold Oxide Nanoparticles with Variable Gold Oxidation State},
  url          = {http://dx.doi.org/10.1021/acs.jpcc.5b00811},
  volume       = {119},
  year         = {2015},
}