Superior Room-Temperature Gas Sensing Performance of Belt-like VO ₂ (B) over 1D V ₂ O ₅ Nanofibers

Achieving reliable room-temperature detection of volatile organic compounds (VOCs) remains a challenge for developing low-power, high-performance gas sensors. In this work, belt-like VO₂(B) single crystals with a strong (00l) (l = 1, 2, and 3) orientation were successfully synthesized via hydrothermal reduction of one-dimensional (1D) V₂O₅ nanofibers. Comparative sensing evaluations demonstrate that VO₂(B) exhibits improved selectivity and an approximately 19-fold higher response to ethanol at room temperature relative to 1D V₂O₅ nanofibers. Density functional theory (DFT) calculations further reveal stronger ethanol adsorption and greater charge transfer on VO₂(B) surfaces, elucidating the origin of its superior room-temperature sensing performance.