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Pt Diffusion Dynamics for the Formation Cr–Pt Core–Shell Nanoparticles

Lookup NU author(s): Dr Gaurav GuptaORCiD

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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.

Publication metadata

Author(s): Gupta G, Iqbal P, Yin F, Liu J, Palmer RE, Sharma S, Leung KCF, Mendes PM

Publication type: Article

Publication status: Published

Journal: Langmuir

Year: 2015

Volume: 31

Issue: 24

Pages: 6917–6923

Print publication date: 23/06/2015

Online publication date: 03/06/2015

Acceptance date: 31/05/2015

ISSN (print): 0743-7463

ISSN (electronic): 1520-5827

Publisher: American Chemical Society

URL: http://dx.doi.org/10.1021/acs.langmuir.5b01410

DOI: 10.1021/acs.langmuir.5b01410

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