Department of Chemistry
Pt diffusion dynamics for the formation Cr–Pt core–shell nanoparticles
© 2015 American Chemical Society. 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.
Source Publication Title
American Chemical Society
Gupta, G., P. Iqbal, F. Yin, J. Liu, R. E. Palmer, S. Sharma, K. Cham-Fai Leung, and P. M. Mendes. "Pt diffusion dynamics for the formation Cr–Pt core–shell nanoparticles." Langmuir 31.24 (2015): 6917-6923.