The Jahn–Teller distortion‐induced electronic structure regulation of Mn‐doped <scp>Co₃O₄</scp> for enhanced acetone detection

Abstract The modulation of the electronic structure of metal oxides is crucial to enhance their gas‐sensing performance. However, there is lacking in profound study on the effect of electronic structure regulation on sensing performance. Herein, we propose an innovative strategy of Jahn–Teller distortion‐induced electronic configuration regulation of Co 3 O 4 to improve acetone sensing performance. After the introduction of Mn 3+ into Co 3 O 4 (Mn‐Co 3 O 4 ), the Jahn–Teller distortion of high‐spin Mn 3+ (t 2g 3 e g 1 ) conversed to low‐spin Mn 4+ (t 2g 3 e g 0 ), resulting in conversion of Co 3+ (t 2g 6 e g 0 ) into Co 2+ (t 2g 6 e g 1 ). As expected, Mn‐Co 3 O 4 exhibits a high response value of 46.7 toward 100 ppm acetone, low limit of detection of 0.75 ppb, high selectivity, and high stability, which are overwhelmingly superior to previous Co 3 O 4 ‐based acetone sensors. The dynamics and thermodynamics analysis demonstrate that the Mn doping improves sensing reaction rate, reduces reaction barrier, and promotes the charge transfer. The theoretical calculations further prove the charge transfer from Mn to Co derived from Jahn–Teller distortion and support promoting the adsorption of acetone on Co 3 O 4 by Mn dopant. Moreover, we demonstrated the substantial potential application of Mn‐Co 3 O 4 sensor as a monitoring gas sensor in pest resistance of Arabidopsis. This work provides a new strategy to design sensing materials from electronic configuration perspective. image