Superior Room-Temperature Gas Sensing Performance of Belt-like VO2(B) over 1D V2O5 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.