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ノーベル化学賞の吉野さん 理事長務める大阪の研究施設に出勤

ノーベル化学賞に選ばれた吉野彰さんが、受賞決定後初めて、自身が理事長を務める大阪府内のリチウムイオン電池の研究施設に出勤し、研究への変わらぬ意欲を示しました。

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Vanadium oxides present a rich magnetic phase diagram depending on the oxidation state of the V ions. In particular the vanadium oxide nanotubes (VO<sub>x</sub> NTs) present several promising perspectives for different technological applications for which it is essential to know the oxidation state of V ions, as well as to evaluate the stability with the aging time of the tubes. In this work we present a systematic study of the time evolution of the magnetic properties of VO<sub>x</sub>NTs. For this complete characterization, we used electron spin resonance (ESR) and dc-susceptibility techniques, which were supplemented with TEM microscopy and XANES. We observed that for aging in normal environmental conditions of pressure, temperature and humidity, the V<sup>4+</sup>ions oxidize to V<sup>5+</sup>. Although the multiwall tubular structure is maintained, this oxidation process produces a marked change in the magnetic properties. We conclude that the aging of the samples affects the V<sup>4+</sup>/ V<sup>5+</sup>relationship in the VO<sub>x</sub> NTs, which may contribute to explain the significant dispersion of data reported in the bibliography.&#13.
PMID: 31469102 [PubMed - as supplied by publisher]
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