Boosting acetone gas sensing performance based on V-doped CeO2 microsphere

In this paper, Vanadium doped CeO2 microsphere were synthesized using a facile hydrothermal method, and three distinct molar ratios of Ce:V precursors (15:1, 11:1 and 7:1) were investigated. The as-prepared materials were then utilized for the sensitive detection of volatile organic compounds (VOCs), specifically acetone. Results show that the V doping leads to a significant improvement in acetone response compared to the pure CeO2 sensor. Notably, the V-doped CeO2 sensing material with the optimal ratio of 11:1 has the highest response value of ∼12 for 100 ppm acetone at a low working temperature of 230 °C. Additionally, this sensor exhibits fast response time (15 s) and recovery time (10 s). Moreover, the V-doped CeO2 (11:1) sensor exhibits a broad concentration range of 0.5–500 ppm for acetone detection. This material also demonstrates great cycle stability, maintaining high stability over a 60-day testing period (RSD = 0.91 %). The as-prepared V-doped CeO2 sensor exhibits excellent sensitivity, response and recovery time, and cycle stability, making it a promising candidate for practical applications in acetone sensing. [Display omitted]