Pt diffusion dynamics for the formation Cr–Pt core–shell nanoparticles

Research output: Contribution to journalArticlepeer-review

Colleges, School and Institutes

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.

Details

Original languageEnglish
Pages (from-to)6917-6923
JournalLangmuir
Volume31
Issue number24
Early online date3 Jun 2015
Publication statusPublished - 23 Jun 2015