title: Pt Diffusion Dynamics for the Formation Cr-Pt Core-Shell Nanoparticles.
abstract: Layered core-shell bimetallic Cr-Pt nanoparticles were prepared by the formation and later reduction of an intermediate Pt-ion-containing supramolecular complex onto preformed Cr nanoparticles. The resultant nanoparticles were characterized by X-ray diffraction analysis, transmission electron microscopy, X-ray photoelectron spectroscopy, and aberration-corrected scanning transmission electron microscopy. The results are consistent with the presence of Pt diffusion during or after bimetallic nanoparticle formation, which has resulted in a Pt/Cr-alloyed core and shell. We postulate that such Pt diffusion occurs by an electric-field-assisted process according to Cabrera-Mott theory and that it originates from the low work function of the preformed oxygen-defective Cr nanoparticles and the rather large electron affinity of Pt.
authors.forename: G
authors.initials: G
authors.lastname: Gupta
authors.forename: P
authors.initials: P
authors.lastname: Iqbal
authors.affiliation: §School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China.
authors.forename: F
authors.initials: F
authors.lastname: Yin
authors.forename: J
authors.initials: J
authors.lastname: Liu
authors.forename: R E
authors.initials: RE
authors.lastname: Palmer
authors.forename: S
authors.initials: S
authors.lastname: Sharma
authors.affiliation: ∥Department of Chemistry and Institute of Creativity, Institute of Molecular Functional Materials, The Hong Kong Baptist University, University Grants Committee, Kowloon Tong, Kowloon, Hong Kong SAR.
authors.forename: K Cham-Fai
authors.initials: KC
authors.lastname: Leung
authors.forename: P M
authors.initials: PM
authors.lastname: Mendes