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<p>A two-step synthesis was developed to produce thermochromic VO<sub>2</sub>(M) nanofibers by vacuum annealing hydrothermally derived VO<sub>2</sub>(B). It is found that the VO<sub>2</sub>(B) → VO<sub>2</sub>(M) transition at 500&#xa0;°C appears to proceed via a topotactic pathway, allowing the fibrous morphology to be well preserved at nanoscale. The resulting monoclinic VO<sub>2</sub>(M) nanofibers have diameters of about 20–200&#xa0;nm and lengths of several micrometers. The VO<sub>2</sub>(M) nanofibers show three characteristic infrared absorptions at about 1012, 892, and 596&#xa0;cm<sup>−1</sup>, providing a clear spectral signature for probing the VO<sub>2</sub>(M) materials. Differential scanning calorimetry (DSC) reveals a metal–insulator (MI) transition with peaks at about 68.5&#xa0;°C (heating) and 58.5&#xa0;°C (cooling), giving a hysteresis of 10&#xa0;°C. The sharp and well-defined DSC peaks indicate improved homogeneity and stoichiometry in the synthesized VO<sub>2</sub>(M) materials. The distinct electronic properties exhibited by the VO<sub>2</sub>(M) nanofibers across the MI transition indicate their potential for infrared-modulating applications.</p> Graphical Abstract <p></p>

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Structural and property evolution during VO2(B) to VO2(M) transition

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月20日

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  • Tao Gao,
  • Bjørn Petter Jelle

摘要

A two-step synthesis was developed to produce thermochromic VO2(M) nanofibers by vacuum annealing hydrothermally derived VO2(B). It is found that the VO2(B) → VO2(M) transition at 500 °C appears to proceed via a topotactic pathway, allowing the fibrous morphology to be well preserved at nanoscale. The resulting monoclinic VO2(M) nanofibers have diameters of about 20–200 nm and lengths of several micrometers. The VO2(M) nanofibers show three characteristic infrared absorptions at about 1012, 892, and 596 cm−1, providing a clear spectral signature for probing the VO2(M) materials. Differential scanning calorimetry (DSC) reveals a metal–insulator (MI) transition with peaks at about 68.5 °C (heating) and 58.5 °C (cooling), giving a hysteresis of 10 °C. The sharp and well-defined DSC peaks indicate improved homogeneity and stoichiometry in the synthesized VO2(M) materials. The distinct electronic properties exhibited by the VO2(M) nanofibers across the MI transition indicate their potential for infrared-modulating applications.

Graphical Abstract