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Size Induced Structural Changes in Molybdenum Oxide Nanoparticles.

Troels Lindahl Christiansen1, Espen D Bøjesen, Mikkel Juelsholt1

  • 1Department of Chemistry and Nanoscience Center , University of Copenhagen , 2100 Copenhagen Ø , Denmark.

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|July 31, 2019
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Summary

Nanosizing molybdenum dioxide (MoO2) particles reveals distinct structures compared to bulk material. Defects in [MoO6] octahedra arrangements lead to new nanostructures in small MoO2 nanoparticles, impacting material properties.

Keywords:
high resolution electron microscopymolybdenum oxidenanoparticlesnanostructurespair distribution function analysisstructural characterizationtotal scattering

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Chemistry

Background:

  • Nanosizing metal oxide particles enhances material properties.
  • Small nanoparticles often exhibit unique structures compared to their bulk counterparts.
  • The specific nanostructure of molybdenum dioxide (MoO2) has remained undetermined.

Purpose of the Study:

  • To determine the nanostructure of MoO2 nanoparticles.
  • To investigate the structural differences between bulk and nanostructured MoO2.
  • To understand the impact of nanosizing on oxide material structures.

Main Methods:

  • Atomic pair distribution function analysis.
  • High-resolution electron microscopy.
  • Defect analysis in [MoO6] octahedra arrangements.

Main Results:

  • A model for nanostructured MoO2 was developed.
  • Defects were identified in [MoO6] octahedra in both large (40-100 nm) and small (<5 nm) MoO2 nanoparticles.
  • Small nanoparticles (<5 nm) exhibit a novel nanostructure distinct from the bulk distorted rutile structure.

Conclusions:

  • The study elucidates the unique nanostructure of MoO2.
  • Structural changes upon nanosizing in oxide materials are further understood.
  • This research contributes to the structure/properties relationship of molybdenum oxides.