室温で高感度センシングを実現 新規「ベルト状VO₂(B)単結晶」ガスセンサー材料を創製～実験と理論計算でVO₂(B)の高度機能性の本質を解明～

2026-02-19 東北大学

図1. V₂O₅ナノファイバーとVO₂(B)のXRDパターン(a,b)、SEMイメージ(c,d)と電子線回析SEADパターン(e,f)

＜関連情報＞

• https://www.tohoku.ac.jp/japanese/2026/02/press20260219-02-gas.html
• https://www.tohoku.ac.jp/japanese/newimg/pressimg/tohokuuniv-press20260219_02web_gas.pdf

1D V2O5ナノファイバーよりも優れた室温ガス検知性能を示すベルト状VO2(B) Superior Room-Temperature Gas Sensing Performance of Belt-like VO2(B) over 1D V2O5 Nanofibers

Qiuyu Cheng,Lei Miao,Peng Song,Qiuyu Jin,Ayahisa Okawa,Takuya Hasegawa,Kenta Hongo,Fu Tang,Wenbin Cao,Te-Wei Chiu,Tohru Sekino,and Shu Yin
ACS Sensors  Published: February 16, 2026
DOI:https://doi.org/10.1021/acssensors.5c03743

Abstract

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.