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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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.

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10 Aug 2020 15:55
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22 Nov 2022 09:22