Size Induced Structural Changes in Molybdenum Oxide Nanoparticles

Troels Lindahl Christiansen; Espen D. Bojesen; Mikkel Juelsholt; Joanne Etheridge; Kirsten M. O. Jensen

doi:10.1021/acsnano.9b01367

Size Induced Structural Changes in Molybdenum Oxide Nanoparticles

Troels Lindahl Christiansen, Espen D. Bojesen, Mikkel Juelsholt, Joanne Etheridge, Kirsten M. O. Jensen

Department of Chemistry

9 Citations (Scopus)

Abstract

Nanosizing of metal oxide particles is a common strategy for improving materials properties; however, small particles often take structures different from the bulk material. MoO₂ nanoparticles show a structure that is distinct from the bulk distorted rutile structure and which has not yet been determined. Here, we present a model for nanostructured MoO₂ obtained through detailed atomic pair distribution function analysis combined with high-resolution electron microscopy. Defects occur in the arrangement of [MoO₆] octahedra, in both large (40-100 nm) nanoparticles, where the overall distorted rutile structure is preserved, and in small nanoparticles (<5 nm), where a new nanostructure is formed. The study provides a piece in the puzzle of understanding the structure/properties relationship of molybdenum oxides and further our understanding of the origin of structural changes taking place upon nanosizing in oxide materials.

Original language	English
Journal	ACS Nano
Volume	13
Issue number	8
Pages (from-to)	8725-8735
ISSN	1936-0851
DOIs	https://doi.org/10.1021/acsnano.9b01367
Publication status	Published - 27 Aug 2019

Keywords

nanostructures
nanoparticles
structural characterization
total scattering
pair distribution function analysis
high resolution electron microscopy
molybdenum oxide

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10.1021/acsnano.9b01367

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title = "Size Induced Structural Changes in Molybdenum Oxide Nanoparticles",

abstract = "Nanosizing of metal oxide particles is a common strategy for improving materials properties; however, small particles often take structures different from the bulk material. MoO2 nanoparticles show a structure that is distinct from the bulk distorted rutile structure and which has not yet been determined. Here, we present a model for nanostructured MoO2 obtained through detailed atomic pair distribution function analysis combined with high-resolution electron microscopy. Defects occur in the arrangement of [MoO6] octahedra, in both large (40-100 nm) nanoparticles, where the overall distorted rutile structure is preserved, and in small nanoparticles (<5 nm), where a new nanostructure is formed. The study provides a piece in the puzzle of understanding the structure/properties relationship of molybdenum oxides and further our understanding of the origin of structural changes taking place upon nanosizing in oxide materials.",

keywords = "nanostructures, nanoparticles, structural characterization, total scattering, pair distribution function analysis, high resolution electron microscopy, molybdenum oxide",

author = "Christiansen, {Troels Lindahl} and Bojesen, {Espen D.} and Mikkel Juelsholt and Joanne Etheridge and Jensen, {Kirsten M. O.}",

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T1 - Size Induced Structural Changes in Molybdenum Oxide Nanoparticles

AU - Christiansen, Troels Lindahl

AU - Bojesen, Espen D.

AU - Juelsholt, Mikkel

AU - Etheridge, Joanne

AU - Jensen, Kirsten M. O.

PY - 2019/8/27

Y1 - 2019/8/27

N2 - Nanosizing of metal oxide particles is a common strategy for improving materials properties; however, small particles often take structures different from the bulk material. MoO2 nanoparticles show a structure that is distinct from the bulk distorted rutile structure and which has not yet been determined. Here, we present a model for nanostructured MoO2 obtained through detailed atomic pair distribution function analysis combined with high-resolution electron microscopy. Defects occur in the arrangement of [MoO6] octahedra, in both large (40-100 nm) nanoparticles, where the overall distorted rutile structure is preserved, and in small nanoparticles (<5 nm), where a new nanostructure is formed. The study provides a piece in the puzzle of understanding the structure/properties relationship of molybdenum oxides and further our understanding of the origin of structural changes taking place upon nanosizing in oxide materials.

AB - Nanosizing of metal oxide particles is a common strategy for improving materials properties; however, small particles often take structures different from the bulk material. MoO2 nanoparticles show a structure that is distinct from the bulk distorted rutile structure and which has not yet been determined. Here, we present a model for nanostructured MoO2 obtained through detailed atomic pair distribution function analysis combined with high-resolution electron microscopy. Defects occur in the arrangement of [MoO6] octahedra, in both large (40-100 nm) nanoparticles, where the overall distorted rutile structure is preserved, and in small nanoparticles (<5 nm), where a new nanostructure is formed. The study provides a piece in the puzzle of understanding the structure/properties relationship of molybdenum oxides and further our understanding of the origin of structural changes taking place upon nanosizing in oxide materials.

KW - nanostructures

KW - nanoparticles

KW - structural characterization

KW - total scattering

KW - pair distribution function analysis

KW - high resolution electron microscopy

KW - molybdenum oxide

U2 - 10.1021/acsnano.9b01367

DO - 10.1021/acsnano.9b01367

M3 - Journal article

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EP - 8735

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Size Induced Structural Changes in Molybdenum Oxide Nanoparticles

Abstract

Keywords

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