Unexpected compositional and structural modification of CoPt<SUB>3</SUB> nanoparticles by extensive surface purification

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...

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Detalles Bibliográficos
Autores principales:	Mizrahi, Martín Daniel, Krylova, Galyna, Giovanetti, Lisandro José, Ramallo López, José Martín, Liu, Yuzi, Shevchenko, Elena V., Requejo, Félix Gregorio
Formato:	Articulo Preprint
Lenguaje:	Inglés
Publicado:	2018
Materias:	Química Transition metal Small-angle x-ray scattering X-ray absorption fine structure Nanoparticle Catalysis Materials science Solvent Chemical engineering Cobalt Leaching (metallurgy)
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/127250
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-127250
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Química Transition metal Small-angle x-ray scattering X-ray absorption fine structure Nanoparticle Catalysis Materials science Solvent Chemical engineering Cobalt Leaching (metallurgy)
spellingShingle	Química Transition metal Small-angle x-ray scattering X-ray absorption fine structure Nanoparticle Catalysis Materials science Solvent Chemical engineering Cobalt Leaching (metallurgy) Mizrahi, Martín Daniel Krylova, Galyna Giovanetti, Lisandro José Ramallo López, José Martín Liu, Yuzi Shevchenko, Elena V. Requejo, Félix Gregorio Unexpected compositional and structural modification of CoPt<SUB>3</SUB> nanoparticles by extensive surface purification
topic_facet	Química Transition metal Small-angle x-ray scattering X-ray absorption fine structure Nanoparticle Catalysis Materials science Solvent Chemical engineering Cobalt Leaching (metallurgy)
description	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.
format	Articulo Preprint
author	Mizrahi, Martín Daniel Krylova, Galyna Giovanetti, Lisandro José Ramallo López, José Martín Liu, Yuzi Shevchenko, Elena V. Requejo, Félix Gregorio
author_facet	Mizrahi, Martín Daniel Krylova, Galyna Giovanetti, Lisandro José Ramallo López, José Martín Liu, Yuzi Shevchenko, Elena V. Requejo, Félix Gregorio
author_sort	Mizrahi, Martín Daniel
title	Unexpected compositional and structural modification of CoPt<SUB>3</SUB> nanoparticles by extensive surface purification
title_short	Unexpected compositional and structural modification of CoPt<SUB>3</SUB> nanoparticles by extensive surface purification
title_full	Unexpected compositional and structural modification of CoPt<SUB>3</SUB> nanoparticles by extensive surface purification
title_fullStr	Unexpected compositional and structural modification of CoPt<SUB>3</SUB> nanoparticles by extensive surface purification
title_full_unstemmed	Unexpected compositional and structural modification of CoPt<SUB>3</SUB> nanoparticles by extensive surface purification
title_sort	unexpected compositional and structural modification of copt<sub>3</sub> nanoparticles by extensive surface purification
publishDate	2018
url	http://sedici.unlp.edu.ar/handle/10915/127250
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bdutipo_str	Repositorios
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Unexpected compositional and structural modification of CoPt<SUB>3</SUB> nanoparticles by extensive surface purification

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