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

G. Gupta; P. Iqbal; F. Yin; J. Liu; R. E. Palmer; S. Sharma; Ken C F Leung; P. M. Mendes

doi:10.1021/acs.langmuir.5b01410

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

G. Gupta, P. Iqbal, F. Yin, J. Liu, R. E. Palmer, S. Sharma, Ken C F Leung, P. M. Mendes^*

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

14 Citations (Scopus)

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.

Original language	English
Pages (from-to)	6917-6923
Number of pages	7
Journal	Langmuir
Volume	31
Issue number	24
Early online date	15 Jun 2015
DOIs	https://doi.org/10.1021/acs.langmuir.5b01410
Publication status	Published - 23 Jun 2015

Scopus Subject Areas

Materials Science(all)
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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title = "Pt Diffusion Dynamics for the Formation Cr–Pt Core–Shell Nanoparticles",

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.",

author = "G. Gupta and P. Iqbal and F. Yin and J. Liu and Palmer, {R. E.} and S. Sharma and Leung, {Ken C F} and Mendes, {P. M.}",

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doi = "10.1021/acs.langmuir.5b01410",

language = "English",

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TY - JOUR

T1 - Pt Diffusion Dynamics for the Formation Cr–Pt Core–Shell Nanoparticles

AU - Gupta, G.

AU - Iqbal, P.

AU - Yin, F.

AU - Liu, J.

AU - Palmer, R. E.

AU - Sharma, S.

AU - Leung, Ken C F

AU - Mendes, P. M.

PY - 2015/6/23

Y1 - 2015/6/23

N2 - 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.

AB - 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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U2 - 10.1021/acs.langmuir.5b01410

DO - 10.1021/acs.langmuir.5b01410

M3 - Journal article

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SN - 0743-7463

VL - 31

SP - 6917

EP - 6923

JO - Langmuir

JF - Langmuir

IS - 24

ER -

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

Abstract

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