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

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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; Mårsell, Erik; Björneholm, Olle; Xu, Xiaojun; Tchaplyguine, Maxim; Liu, Zejin.

I: Journal of Chemical Physics, Vol. 141, Nr. 8, 084302, 2014.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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Zhang, Chaofan ; Andersson, Tomas ; Mikkelä, Mikko-Heikki ; Mårsell, Erik ; Björneholm, Olle ; Xu, Xiaojun ; Tchaplyguine, Maxim ; Liu, Zejin. / Alloying and oxidation of in situ produced core-shell Al@Yb nanoalloy particles-An "on-the-fly" study. I: Journal of Chemical Physics. 2014 ; Vol. 141, Nr. 8.

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TY - JOUR

T1 - Alloying and oxidation of in situ produced core-shell Al@Yb nanoalloy particles-An "on-the-fly" study.

AU - Zhang, Chaofan

AU - Andersson, Tomas

AU - Mikkelä, Mikko-Heikki

AU - Mårsell, Erik

AU - Björneholm, Olle

AU - Xu, Xiaojun

AU - Tchaplyguine, Maxim

AU - Liu, Zejin

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

U2 - 10.1063/1.4893115

DO - 10.1063/1.4893115

M3 - Article

VL - 141

JO - Journal of Chemical Physics

T2 - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

IS - 8

M1 - 084302

ER -