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Preparation and Evaluation of Hybrid Composites of Chemical Fuel and Multi-walled Carbon Nanotubes in the Study of Thermopower Waves
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Aging effect on vanadium oxide hybrid nanotubes.

Martín E Saleta1,2, Dina Tobia1, Santiago J A Figueroa3

  • 1Instituto de Nanociencia y Nanotecnología (INN), CNEA-CONICET, Centro Atómico Bariloche, Av. Bustillo 9500, 8400 S. C. de Bariloche (RN), Argentina.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 31, 2019
PubMed
Summary

Aging vanadium oxide nanotubes (VOx NTs) causes V4+ ions to oxidize to V5+. This change significantly alters magnetic properties, impacting their technological applications and explaining data variability in research.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Vanadium oxides exhibit complex magnetic phase diagrams influenced by vanadium ion oxidation states.
  • Vanadium oxide nanotubes (VOx NTs) show promise for technological applications, necessitating understanding of V ion oxidation states and material stability over time.

Purpose of the Study:

  • To systematically investigate the time evolution of magnetic properties in VOx NTs.
  • To correlate changes in magnetic properties with alterations in V ion oxidation states during aging.

Main Methods:

  • Electron spin resonance (ESR) and dc-susceptibility measurements were employed for magnetic characterization.
  • Transmission electron microscopy (TEM) and X-ray absorption near-edge structure (XANES) were used for structural and chemical state analysis.

Main Results:

  • Aging VOx NTs under ambient conditions leads to the oxidation of V4+ ions to V5+.
  • Despite structural integrity, this oxidation process significantly modifies the magnetic properties of the nanotubes.
  • The V4+/V5+ ratio is demonstrably affected by sample aging.

Conclusions:

  • Sample aging impacts the V4+/V5+ ratio in VOx NTs.
  • The observed changes in oxidation state and magnetic properties during aging may explain the wide dispersion of data in existing literature.
  • Understanding aging effects is crucial for reliable application of VOx NTs.