An amperometric NO<sub>2sub> sensor based on nano-structured La<sub>0.75sub>Sr<sub>0.25sub>Cr<sub>0.5sub>Mn<sub>0.5sub>O<sub>3鈭捨?/sub> prepared by impregnating method
- 作者：L. Dai<sup>asup><sup> ; sup><sup>bsup> ; L. Wang<sup>bsup><sup> ; sup><sup>tswling@126.comsup> ; G.J. Shao<sup>asup> ; Y.H. Li<sup>bsup> ; Z.C. Hao<sup>bsup>
- 关键词：NO2 sensor ; Amperometric ; Impregnating method ; Nano-structure ; La0.75Sr0.25Cr0.5Mn0.5O3&minus ; 未
- 刊名：Journal of Alloys and Compounds
- 出版年：2012
- 期刊代码：45_09258388
- 类别：ms
- 出版时间：15 June, 2012
- 卷：526
- 期：Complete
- 页码：145-150
- 文件大小：913 K
摘要
An amperometric NO<sub>2sub> sensor using nano-structured perovskite-type oxide La<sub>0.75sub>Sr<sub>0.25sub>Cr<sub>0.5sub>Mn<sub>0.5sub>O<sub>3鈭捨?/sub> (LSCM) as sensing electrode with Ce<sub>0.9sub>Gd<sub>0.1sub>O<sub>1.95sub> (CGO)electrolyte was fabricated. The LSCM particles were prepared in the porous CGO layer by impregnating method. The composition and microstructure of the sample were characterized by XRD and SEM, respectively. The properties of the sensor for monitoring NO<sub>2sub> were studied. The results showed that the LSCM particles in the range of 50-150 nm were homogeneously dispersed in the porous CGO layer. The response current was almost linear to NO<sub>2sub> concentration in the range between 20 and 300 ppm. With the temperatures increasing, the sensitivity increased and reached 111.36 nA ppm<sup>鈭?sup> at 500 掳C. The sensor showed good response, recovery, reproducibility and stability. Although the response current was slightly affected by changing O<sub>2sub> concentrations in the range of 0-10 vol%, the influence was negligibly small.