Transformation dynamics of Ni clusters into NiO rings under electron beam irradiation

Daniel Knez, Philipp Thaler, Alexander VOLK, Gerald Kothleitner, Wolfgang Ernst, Ferdinand Hofer

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

WereportthetransformationofnickelclustersintoNiOringsbyanelectronbeaminducednanoscaleKirkendall effect.High-puritynickelclustersconsistingofafewthousandatomshavebeenusedasprecursors andweresynthesizedwiththesuperfluid heliumdroplettechnique.Aberration-corrected,analytical scanningtransmissionelectronmicroscopywasappliedtooxidiseandsimultaneouslyanalysethe nanostructures.Thetransientdynamicsoftheoxidationcouldbedocumentedbytimelapseseriesusing high-angleannulardark-field imagingandelectronenergy-lossspectroscopy.Atwo-stepCabrera-Mott oxidationmechanismwasidentified. Itwasfoundthatwateradsorbedadjacenttotheclustersactsas oxygensourcefortheelectronbeaminducedoxidation.Thesize-dependentoxidationratewases-timated byquantitativeEELSmeasurementscombinedwithmoleculardynamicssimulations.Ourfindings couldservetobettercontrolsamplechangesduringexaminationinanelectronmicroscope,andmight provideamethodologytogenerateothermetaloxidenanostructures.
Originalspracheenglisch
Seiten (von - bis)105-111
FachzeitschriftUltramicroscopy
Jahrgang176
DOIs
PublikationsstatusVeröffentlicht - 2017

ASJC Scopus subject areas

  • !!Materials Science(all)

Fields of Expertise

  • Advanced Materials Science

Treatment code (Nähere Zuordnung)

  • Basic - Fundamental (Grundlagenforschung)

Dieses zitieren