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

16 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

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@article{da2881c9482049309dcdd4edaa5b5ea5,

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.\}",

note = "We acknowledge the financial support of this work by the EPSRC (EP/K027263/1), the University of Leeds EPSRC Nanoscience and Nanotechnology Facility (LENNF) for access to the TEM, and University of Newcastle EPSRC facility (NEXUS) for access to the XPS. The STEM instrument employed in this research was obtained through Birmingham Science City Project “Creating and Characterizing Next Generation Advanced Materials,” supported by Advantage West Midlands (AWM) and in part funded by the European Regional Development Fund (ERDF). Publisher Copyright: {\textcopyright} 2015 American Chemical Society.",

year = "2015",

month = jun,

day = "23",

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

language = "English",

volume = "31",

pages = "6917--6923",

journal = "Langmuir",

issn = "0743-7463",

publisher = "American Chemical Society",

number = "24",

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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.

N1 - We acknowledge the financial support of this work by the EPSRC (EP/K027263/1), the University of Leeds EPSRC Nanoscience and Nanotechnology Facility (LENNF) for access to the TEM, and University of Newcastle EPSRC facility (NEXUS) for access to the XPS. The STEM instrument employed in this research was obtained through Birmingham Science City Project “Creating and Characterizing Next Generation Advanced Materials,” supported by Advantage West Midlands (AWM) and in part funded by the European Regional Development Fund (ERDF). Publisher Copyright: © 2015 American Chemical Society.

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.

UR - https://www.scopus.com/pages/publications/84935027995

U2 - 10.1021/acs.langmuir.5b01410

DO - 10.1021/acs.langmuir.5b01410

M3 - Journal article

AN - SCOPUS:84935027995

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

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