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Influence of dimensionality on phase transition in VO2 nanocrystals

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2013
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Authors
Blagojević, Vladimir A.
Obradović, Nina
Cvjetićanin, Nikola
Minić, Dragica M.
Contributors
Ristić, Momčilo M.
Article (Published version)
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Abstract
Hydrothermally synthesized one-dimensional and two-dimensional nanocrystals of VO2 undergo phase transition around 65°C, where temperature and mechanism of phase transition are dependent on dimensionality of nanocrystals. Both nanocrystalline samples exhibit depression of phase transition temperature compared to the bulk material, the magnitude of which depends on the dimensionality of the nanocrystal. One-dimensional nanoribbons exhibit lower phase transition temperature and higher values of apparent activation energy than two-dimensional nanosheets. The phase transition exhibits as a complex process with somewhat lower value of enthalpy than the phase transition in the bulk, probably due to higher proportion of surface atoms in the nanocrystals. High values of apparent activation energy indicate that individual steps of the phase transition involve simultaneous movement of large groups of atoms, as expected for single-domain nanocrystalline materials. [Projekat Ministarstva nauke Rep...ublike Srbije, br. 142015]

Keywords:
nanocrystals / vanadium oxide / phase transition / size effects
Source:
Science of Sintering, 2013, 45, 3, 305-311
Publisher:
  • Belgrade : International Institute for the Science of Sintering
Projects:
  • Razvoj i primena metoda za praćenje kvaliteta industrijskih proizvoda i životne sredine (RS-142015)

DOI: 10.2298/SOS1303305B

ISSN: 0350-820X (Print); 1820-7413 (Online)

WoS: 000339449200007

Scopus: 2-s2.0-84893402989
[ Google Scholar ]
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URI
http://dais.sanu.ac.rs/123456789/373
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Institution
Институт техничких наука САНУ

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