Formation, thermal stability, and surface composition of size-selected AuFe nanoparticles

The surface composition of isolated Au 0.5 Fe 0.5 nanoparticles (NPs) synthesized by micelle encapsulation and supported on Ti O 2 ( 110 ) has been investigated. The study reveals that phase-segregated structures are present after annealing at 300 ° C . A subsequent thermal treatment at 700 ° C resu...

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Bibliographic Details
Published in:Applied physics letters 2007-09, Vol.91 (11), p.113110-113110-3
Main Authors: Naitabdi, A., Roldan Cuenya, B.
Format: Article
Language:English
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Summary:The surface composition of isolated Au 0.5 Fe 0.5 nanoparticles (NPs) synthesized by micelle encapsulation and supported on Ti O 2 ( 110 ) has been investigated. The study reveals that phase-segregated structures are present after annealing at 300 ° C . A subsequent thermal treatment at 700 ° C resulted in the formation of a AuFe alloy. At this temperature, a state characteristic of Fe was identified at the NPs' surface. Annealing at 900 ° C resulted in the disappearance of the Fe surface state, which is attributed to Au segregation to the surface. The initial hexagonal NP arrangement on the Ti O 2 ( 110 ) surface was preserved up to 900 ° C . At 1000 ° C , Au desorption was observed.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2784957