MOF-Derived In 2 O 3 /BiVO 4 Composites for Sensitive and Trace Detection of n -C 4 H 9 OH

作者：Pengfei Song, Feiran Sun, Tingyue Luan, Qingyong Meng, Wangchang Geng · 发表于：ACS Sensors · 年份：2025 · DOI：10.1021/acssensors.5c00284 · 被引用次数：24 · 研究领域：Gas Sensing Nanomaterials and Sensors、Advanced Chemical Sensor Technologies、Analytical Chemistry and Sensors

MOF-derived MOS with mesoporous structures and large surface areas are regarded as ideal materials for fabricating high-performance gas sensors. In this study, we successfully synthesized MOF-derived In 2 O 3 /BiVO 4 composites through a three-step method that includes solvothermal, hydrothermal, and mechanical stirring processes. The characterization results indicate that the In 2 O 3 /BiVO 4 composites exhibit both hollow microtube and fishbone-like structures. Notably, under 200 °C, the response of the In 2 O 3 /BiVO 4 -2-based sensor to 100 ppm n -C 4 H 9 OH gas reaches as high as 149.2, which is 7.8-fold greater than that of pure In 2 O 3 . In addition, the In 2 O 3 /BiVO 4 -2 sensor demonstrates an ultralow theoretical detection threshold (12.6 ppb), satisfactory reproducibility, and remarkable selectivity to n -C 4 H 9 OH. By integrating experimental results with first-principles calculations, we elucidate the underlying mechanisms that enable In 2 O 3 /BiVO 4 composites to exhibit remarkable responsiveness and exceptional selectivity toward n -C 4 H 9 OH gas. This research presents an innovative approach for creating high-performance n -C 4 H 9 OH gas-sensing materials.