Jump to main content
Jump to site search

Issue 14, 2018
Previous Article Next Article

Unexpected compositional and structural modification of CoPt3 nanoparticles by extensive surface purification

Author affiliations

Abstract

We combined synchrotron small angle X-ray scattering, X-ray fluorescence and extended X-ray absorption fine structure spectroscopy to probe the structure of chemically synthesized CoPt3 nanoparticles (NPs) after ligand removal via the commonly accepted solvent/nonsolvent approach. We showed that the improved catalytic activity of extensively purified NPs could not be explained only in terms of a “cleaner” surface. We found that extensive surface purification results in the substantial leaching of the Co atoms from the chemically synthesized CoPt3 NPs transforming them into CoPt3/Pt core/shell structures with an unexpectedly thick (∼0.5 nm) Pt shell. We indicated that the improved catalytic activity of extensively purified NPs in octyne hydrogenation reaction can be explained by the formation of CoPt3/Pt core/shell structures. Also, we demonstrated that drastic compositional and structural transformation of water transferred CoPt3 NPs was rather a result of extensive removal of native ligands via a solvent/nonsolvent approach than leaching of cobalt atoms in aqueous media. We expect that these findings can be relevant to other transition metal based multicomponent NPs.

Graphical abstract: Unexpected compositional and structural modification of CoPt3 nanoparticles by extensive surface purification

Back to tab navigation

Supplementary files

Publication details

The article was received on 04 Jan 2018, accepted on 18 Feb 2018 and first published on 19 Feb 2018


Article type: Paper
DOI: 10.1039/C8NR00060C
Citation: Nanoscale, 2018,10, 6382-6392
  •   Request permissions

    Unexpected compositional and structural modification of CoPt3 nanoparticles by extensive surface purification

    M. D. Mizrahi, G. Krylova, L. J. Giovanetti, J. M. Ramallo-López, Y. Liu, E. V. Shevchenko and F. G. Requejo, Nanoscale, 2018, 10, 6382
    DOI: 10.1039/C8NR00060C

Search articles by author

Spotlight

Advertisements