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<p>Vanadium dioxide VO<sub>2</sub>(B) nanofibers with typical diameters of about 20–200&#xa0;nm and lengths up to several microns were prepared via hydrothermal synthesis. The as-prepared VO<sub>2</sub>(B) nanofibers crystallized in a monoclinic structure (space group <i>C2/m</i>) with unit cell parameters <i>a</i> = 12.0717 Å, <i>b</i> = 3.6949 Å, <i>c</i> = 6.4226 Å, and <i>β</i> = 106.9986°, and elongated along the &lt; 001 &gt; direction. The optical band gap energy of the VO<sub>2</sub>(B) nanofibers was estimated to be about 1.8&#xa0;eV based on the UV-visible absorption. The VO<sub>2</sub>(B) nanofibers had six diagnostic infrared absorptions at about 1032, 1012, 982, 900, 724, and 660&#xa0;cm<sup>− 1</sup>, representing a clear signature for probing VO<sub>2</sub>(B) materials. The VO<sub>2</sub>(B) nanofibers were nearly Raman inactive at room temperature due to the strong electron-phonon interaction. The thermal conductivity of the VO<sub>2</sub>(B) nanofibers was calculated to be approximately 1.06&#xa0;W/(m∙K) at room temperature. The distinctive structural and physical properties of the VO₂(B) nanofibers may open up new possibilities for both fundamental research and technological applications.</p>

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Structural and spectroscopic properties of vanadium dioxide VO2(B) nanofibers

  • 期刊论文

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  • 发表日期：

    2025年11月19日

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  • Tao Gao,
  • Bjørn Petter Jelle

摘要

Vanadium dioxide VO2(B) nanofibers with typical diameters of about 20–200 nm and lengths up to several microns were prepared via hydrothermal synthesis. The as-prepared VO2(B) nanofibers crystallized in a monoclinic structure (space group C2/m) with unit cell parameters a = 12.0717 Å, b = 3.6949 Å, c = 6.4226 Å, and β = 106.9986°, and elongated along the < 001 > direction. The optical band gap energy of the VO2(B) nanofibers was estimated to be about 1.8 eV based on the UV-visible absorption. The VO2(B) nanofibers had six diagnostic infrared absorptions at about 1032, 1012, 982, 900, 724, and 660 cm− 1, representing a clear signature for probing VO2(B) materials. The VO2(B) nanofibers were nearly Raman inactive at room temperature due to the strong electron-phonon interaction. The thermal conductivity of the VO2(B) nanofibers was calculated to be approximately 1.06 W/(m∙K) at room temperature. The distinctive structural and physical properties of the VO₂(B) nanofibers may open up new possibilities for both fundamental research and technological applications.