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

Gupta, G. and Iqbal, P. and Yin, F. and Liu, J. and Palmer, R. E. and Sharma, S. and Leung, K. Cham-Fai and Mendes, P. M. (2015) Pt Diffusion Dynamics for the Formation Cr–Pt Core–Shell Nanoparticles. Langmuir, 31. 6917–6923. ISSN 0743-7463

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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.

Item Type:
Journal Article
Journal or Publication Title:
Langmuir
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3104
Subjects:
ID Code:
146444
Deposited By:
Deposited On:
10 Aug 2020 15:55
Refereed?:
Yes
Published?:
Published
Last Modified:
12 Aug 2020 10:30