Atomic imaging of oxide-supported metallic nanocrystals

Zhenxing Feng; Alexander Kazimirov; Michael J. Bedzyk

doi:10.1021/nn203273e

Atomic imaging of oxide-supported metallic nanocrystals

Zhenxing Feng, Alexander Kazimirov, Michael J. Bedzyk^*

^*Corresponding author for this work

Materials Science and Engineering

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

14 Scopus citations

Abstract

The nucleation of noble metal nanoparticles on oxide surfaces can lead to dramatic enhancements in catalytic activity that are related to the atomic-scale formation of the nanoparticles and interfaces. For the case of submonolayer Pt deposited on the 2 - 1 SrTiO ₃(001) surface atomic-force microscopy shows the formation of nanoparticles. We use X-ray standing wave (XSW) atomic imaging to show that these nanoparticles are composed of Pt face-centered-cubic nanocrystals with cube-on-cube epitaxy laterally correlated to the substrate unit cell. The phase sensitivity of the XSW allows for a direct measurement of the interface offset between the two unit cells along the c-axis. Different Pt coverages lead to differences in the observed XSW image of the interfacial structure, which is explained by a proposed model based on the Pt-Pt interaction becoming stronger than the Pt-substrate interaction as the global coverage is increased from 0.2 to 0.6 ML.

Original language	English (US)
Pages (from-to)	9755-9760
Number of pages	6
Journal	ACS nano
Volume	5
Issue number	12
DOIs	https://doi.org/10.1021/nn203273e
State	Published - Dec 27 2011

Keywords

X-ray standing waves
atomic imaging
epitaxy
interface structure
nanoparticles
platinum
strontium titanate

ASJC Scopus subject areas

General Engineering
General Physics and Astronomy
General Materials Science

Access to Document

10.1021/nn203273e

Cite this

@article{88015afea70a4e33903778b2891c4822,

title = "Atomic imaging of oxide-supported metallic nanocrystals",

abstract = "The nucleation of noble metal nanoparticles on oxide surfaces can lead to dramatic enhancements in catalytic activity that are related to the atomic-scale formation of the nanoparticles and interfaces. For the case of submonolayer Pt deposited on the 2 - 1 SrTiO 3(001) surface atomic-force microscopy shows the formation of nanoparticles. We use X-ray standing wave (XSW) atomic imaging to show that these nanoparticles are composed of Pt face-centered-cubic nanocrystals with cube-on-cube epitaxy laterally correlated to the substrate unit cell. The phase sensitivity of the XSW allows for a direct measurement of the interface offset between the two unit cells along the c-axis. Different Pt coverages lead to differences in the observed XSW image of the interfacial structure, which is explained by a proposed model based on the Pt-Pt interaction becoming stronger than the Pt-substrate interaction as the global coverage is increased from 0.2 to 0.6 ML.",

keywords = "X-ray standing waves, atomic imaging, epitaxy, interface structure, nanoparticles, platinum, strontium titanate",

author = "Zhenxing Feng and Alexander Kazimirov and Bedzyk, {Michael J.}",

year = "2011",

month = dec,

day = "27",

doi = "10.1021/nn203273e",

language = "English (US)",

volume = "5",

pages = "9755--9760",

journal = "ACS nano",

issn = "1936-0851",

publisher = "American Chemical Society",

number = "12",

}

TY - JOUR

T1 - Atomic imaging of oxide-supported metallic nanocrystals

AU - Feng, Zhenxing

AU - Kazimirov, Alexander

AU - Bedzyk, Michael J.

PY - 2011/12/27

Y1 - 2011/12/27

N2 - The nucleation of noble metal nanoparticles on oxide surfaces can lead to dramatic enhancements in catalytic activity that are related to the atomic-scale formation of the nanoparticles and interfaces. For the case of submonolayer Pt deposited on the 2 - 1 SrTiO 3(001) surface atomic-force microscopy shows the formation of nanoparticles. We use X-ray standing wave (XSW) atomic imaging to show that these nanoparticles are composed of Pt face-centered-cubic nanocrystals with cube-on-cube epitaxy laterally correlated to the substrate unit cell. The phase sensitivity of the XSW allows for a direct measurement of the interface offset between the two unit cells along the c-axis. Different Pt coverages lead to differences in the observed XSW image of the interfacial structure, which is explained by a proposed model based on the Pt-Pt interaction becoming stronger than the Pt-substrate interaction as the global coverage is increased from 0.2 to 0.6 ML.

AB - The nucleation of noble metal nanoparticles on oxide surfaces can lead to dramatic enhancements in catalytic activity that are related to the atomic-scale formation of the nanoparticles and interfaces. For the case of submonolayer Pt deposited on the 2 - 1 SrTiO 3(001) surface atomic-force microscopy shows the formation of nanoparticles. We use X-ray standing wave (XSW) atomic imaging to show that these nanoparticles are composed of Pt face-centered-cubic nanocrystals with cube-on-cube epitaxy laterally correlated to the substrate unit cell. The phase sensitivity of the XSW allows for a direct measurement of the interface offset between the two unit cells along the c-axis. Different Pt coverages lead to differences in the observed XSW image of the interfacial structure, which is explained by a proposed model based on the Pt-Pt interaction becoming stronger than the Pt-substrate interaction as the global coverage is increased from 0.2 to 0.6 ML.

KW - X-ray standing waves

KW - atomic imaging

KW - epitaxy

KW - interface structure

KW - nanoparticles

KW - platinum

KW - strontium titanate

UR - http://www.scopus.com/inward/record.url?scp=84555169191&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84555169191&partnerID=8YFLogxK

U2 - 10.1021/nn203273e

DO - 10.1021/nn203273e

M3 - Article

C2 - 22032686

AN - SCOPUS:84555169191

SN - 1936-0851

VL - 5

SP - 9755

EP - 9760

JO - ACS nano

JF - ACS nano

IS - 12

ER -

Atomic imaging of oxide-supported metallic nanocrystals

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this