Ammonium Sulfide Gas Sensor Based on Cataluminescence Emission on the Surface of CoFe2O4

作者：He Shuhua^*

来源：Acta Chimica Sinica, 2011, 69(24): 2964-2968.

• cobalt iron oxide
• cataluminescence
• ammonium sulfide
• gas sensor

On the basis of cataluminescence (CTL) emission on the surface of CoFe2O4 nanomaterial, a novel and sensitive sensor for the determination of ammonium sulfide was developed. The CTL characteristics and the optimal conditions including three nanomaterials morphology, air flow rate, working temperature and wavelength were investigated. Under the optimized conditions, the linear range of CTL intensity versus concentration of ammonium sulfide was 0.13 similar to 13 mg/L (r=0.9951, n=9) with a detection limit of 0.04 mg/L (3 sigma). The relative standard deviation (RSD) for 1.3 mg/L ammonium sulfide was 1.8% (n=8). Interference experiments showed that there was no response from common foreign substances, and the present sensor can be used for the continuous determination of 1.3 mg/L ammonium sulfide more than 60 h over two weeks with a RSD of less than 5%. Meanwhile, this sensor was successfully applied to determine ammonium sulfide in artificial samples with recoveries from 94.7% to 103.9%.

• 出版日期2011-12-28
• 单位长江师范学院