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

Naitabdi, A.; Roldan Cuenya, Beatriz

doi:10.1063/1.2784957

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

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Naitabdi, A., & Roldan Cuenya, B. (2007). Formation, thermal stability, and surface composition of size-selected AuFe nanoparticles. Applied Physics Letters, 91(11): 113110. doi:10.1063/1.2784957.

Cite as: https://hdl.handle.net/21.11116/0000-0006-DA58-2

Abstract

The surface composition of isolated Au_0.5Fe_0.5 nanoparticles (NPs) synthesized by micelleencapsulation and supported on TiO₂ (110) has been investigated. The study reveals thatphase-segregated structures are present after annealing at 300 ° C. A subsequent thermal treatmentat 700 ° C resulted in the formation of a AuFe alloy. At this temperature, a state characteristic of Fewas identified at the NPs’ surface. Annealing at 900 ° C resulted in the disappearance of the Fesurface state, which is attributed to Au segregation to the surface. The initial hexagonal NParrangement on the TiO₂ (110) surface was preserved up to 900 ° C. At 1000 ° C, Au desorption wasobserved.