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Alloying and oxidation of in situ produced core-shell Al@Yb nanoalloy particles-An "on-the-fly" study.

Zhang, Chaofan; Andersson, Tomas; Mikkelä, Mikko-Heikki LU ; Mårsell, Erik LU ; Björneholm, Olle; Xu, Xiaojun; Tchaplyguine, Maxim LU and Liu, Zejin (2014) In Journal of Chemical Physics 141(8).
Abstract
Core-shell-structured nanoalloy particles with an Al-dominated interior covered by few Yb monolayers have been fabricated using a vapor-aggregation method involving magnetron sputtering. The radially segregated structure of the Yb-Al nanoparticles has been disclosed by "on-the-fly" photoelectron spectroscopy monitoring of the nanoparticle beam in Yb 4f and Al 2p electron binding energy regions. Both, the binding energy values and the electron microscopy images taken on the deposited nanoparticles, allow estimating their dimensions to be in the 5-10 nm range. The photoelectron spectroscopy results suggest that in these nanoparticles no trivalent Yb - the typical case for the macroscopic Yb-Al alloy - is present. The oxidation of preformed... (More)
Core-shell-structured nanoalloy particles with an Al-dominated interior covered by few Yb monolayers have been fabricated using a vapor-aggregation method involving magnetron sputtering. The radially segregated structure of the Yb-Al nanoparticles has been disclosed by "on-the-fly" photoelectron spectroscopy monitoring of the nanoparticle beam in Yb 4f and Al 2p electron binding energy regions. Both, the binding energy values and the electron microscopy images taken on the deposited nanoparticles, allow estimating their dimensions to be in the 5-10 nm range. The photoelectron spectroscopy results suggest that in these nanoparticles no trivalent Yb - the typical case for the macroscopic Yb-Al alloy - is present. The oxidation of preformed Yb-Al nanoparticles was successfully attempted, leading to the appearance of divalent Yb surface oxide - in contrast to the bulk macroscopic Yb which is trivalent in the oxide. Our results suggest that at intermediate oxygen exposures "sandwich-like" nanoparticles of YbO/Yb/Al were synthesized. At higher O2 exposures, the oxygen seems to penetrate all the way to the Yb-Al interface. The results of the present study have to be considered when photonic applications of Yb-doped garnet nanoparticles are planned. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
Journal of Chemical Physics
volume
141
issue
8
publisher
American Institute of Physics
external identifiers
  • pmid:25173009
  • wos:000341987600015
  • scopus:84906846721
ISSN
0021-9606
DOI
10.1063/1.4893115
language
English
LU publication?
yes
id
14b5aea4-81f9-41e4-b604-7a62dadc098c (old id 4692873)
date added to LUP
2014-10-03 14:11:08
date last changed
2017-01-01 03:31:04
@article{14b5aea4-81f9-41e4-b604-7a62dadc098c,
  abstract     = {Core-shell-structured nanoalloy particles with an Al-dominated interior covered by few Yb monolayers have been fabricated using a vapor-aggregation method involving magnetron sputtering. The radially segregated structure of the Yb-Al nanoparticles has been disclosed by "on-the-fly" photoelectron spectroscopy monitoring of the nanoparticle beam in Yb 4f and Al 2p electron binding energy regions. Both, the binding energy values and the electron microscopy images taken on the deposited nanoparticles, allow estimating their dimensions to be in the 5-10 nm range. The photoelectron spectroscopy results suggest that in these nanoparticles no trivalent Yb - the typical case for the macroscopic Yb-Al alloy - is present. The oxidation of preformed Yb-Al nanoparticles was successfully attempted, leading to the appearance of divalent Yb surface oxide - in contrast to the bulk macroscopic Yb which is trivalent in the oxide. Our results suggest that at intermediate oxygen exposures "sandwich-like" nanoparticles of YbO/Yb/Al were synthesized. At higher O2 exposures, the oxygen seems to penetrate all the way to the Yb-Al interface. The results of the present study have to be considered when photonic applications of Yb-doped garnet nanoparticles are planned.},
  articleno    = {084302},
  author       = {Zhang, Chaofan and Andersson, Tomas and Mikkelä, Mikko-Heikki and Mårsell, Erik and Björneholm, Olle and Xu, Xiaojun and Tchaplyguine, Maxim and Liu, Zejin},
  issn         = {0021-9606},
  language     = {eng},
  number       = {8},
  publisher    = {American Institute of Physics},
  series       = {Journal of Chemical Physics},
  title        = {Alloying and oxidation of in situ produced core-shell Al@Yb nanoalloy particles-An "on-the-fly" study.},
  url          = {http://dx.doi.org/10.1063/1.4893115},
  volume       = {141},
  year         = {2014},
}