查找使用阿拉丁产品的科研文献

Fluorine and oxygen-functionalized silicon nitride with abundant oxygen vacancies for cataluminescence sensing of H2S

Yu Zhou,Hui Gong,Hou-Jing Liu

Efficient, selective and highly sensitive detection of H 2 S is important for environmental protection and human security. Nanomaterials-based cataluminescence (CTL) sensors, especially metal-free catalysts, have been used for gas sensing. Herein, due to the efficient electron transfer and high specific area of silicon nitride (Si 3 N 4 ), combined with the strong electronegativity of fluorine and oxygen, we purposely synthesized F and O-modified Si 3 N 4 (F/O-Si 3 N 4 ) by engineering surface states and catalytic properties. We then used it to construct a H 2 S CTL gas sensor. Compared with other metal-based CTL sensors, the F/O-Si 3 N 4 -based CTL system exhibited high sensitivity and a longer lifetime stability. The detection limit was 0.027 μg mL −1 in the detection range of 0.49–8.17 μg mL −1 , and a relative standard deviation (RSD) of better than 3.3% were obtained. Further research demonstrated the luminescence mechanism, in which the rich oxygen vacancies of Si 3 N 4 promoted the adsorption of O 2 and the formation of F-Si sites due to the catalytic oxidation of H 2 S and the generation of SO 2 *. This served as the main emitter accounting for the strong CTL emission. This work is the first report of the application of Si 3 N 4 as a catalyst for CTL H 2 S sensing. This will expand the methods for enhancing the catalytic activity and practical applications of metal-free materials.