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RESEARCH PRODUCT

Unraveling the Formation of Core−Shell Structures in Nanoparticles by S-XPS

Jonder MoraisFabiano BernardiGerhard H. FecherMaria Do Carmo Martins Alves

subject

Materials scienceSynchrotron radiationNanoparticlePhotoelectric effectPhoton energySynchrotronlaw.inventionX-ray photoelectron spectroscopylawChemical physicsPhysics::Atomic and Molecular ClustersGeneral Materials SciencePhysical and Theoretical ChemistryAtomic physicsHigh-resolution transmission electron microscopyBimetallic strip

description

The combination of the surface sensitivity of X-ray photoelectron spectroscopy (XPS) with the high flux and variable photon energy excitation of Synchrotron radiation (S-XPS) is used to probe the atomic distribution of bimetallic nanoparticles. Based on the energy dependence of the photoemission differential cross section of core level photoelectrons, we propose a methodology to monitor the formation and to evaluate sizes of the core−shell structure. We have successfully applied it to unveil the mechanism involved in the atomic rearrangement of thermally treated Pt0.7Pd0.3 nanoparticles.

https://doi.org/10.1021/jz100049z