Pt diffusion dynamics for the formation Cr–Pt core–shell nanoparticles

G. Gupta; P. Iqbal; F. Yin; J. Liu; R. E. Palmer; S. Sharma; K. Cham-fai 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, K. Cham-fai Leung, P. M. Mendes

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

282 Downloads (Pure)

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
Journal	Langmuir
Volume	31
Issue number	24
Early online date	3 Jun 2015
DOIs	https://doi.org/10.1021/acs.langmuir.5b01410
Publication status	Published - 23 Jun 2015

Access to Document

10.1021/acs.langmuir.5b01410

Gupta_et_al_Pt_diffusion_dynamics_Langmuir_2015
Eligibility for repository : checked 03/08/2015
Final published version, 3.6 MBLicence: Creative Commons: Attribution (CC BY)

http://pubs.acs.org/doi/abs/10.1021/acs.langmuir.5b01410

Establish Career Fellowship Professor Richard Palmer - Super-Abundant Size-Selected Cluister Technology for Nanoscale Design of Functional Materials
Palmer, R.
Engineering & Physical Science Research Council
1/01/13 → 28/02/17
Project: Research

Cite this

@article{66c23f4924804b11807bdd1c1ab227d4,

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, {K. Cham-fai} and Mendes, {P. M.}",

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",

}

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, K. Cham-fai

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.

U2 - 10.1021/acs.langmuir.5b01410

DO - 10.1021/acs.langmuir.5b01410

M3 - Article

C2 - 26039093

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

Access to Document

Fingerprint

Projects

Establish Career Fellowship Professor Richard Palmer - Super-Abundant Size-Selected Cluister Technology for Nanoscale Design of Functional Materials

Cite this