A cataluminescence gas sensor for ammonium sulfide based on Fe3O4–carbon nanotubes composite |
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Authors: | Shuxia Xu Li Tang Chen Bi Xianxiang Wang Yi Lv |
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Affiliation: | 1. Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, People's Republic of China;2. College of Materials and Chemistry and Chemical Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, People's Republic of China |
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Abstract: | In the present work, Fe3O4–carbon nanotubes (CNTs) composite was explored as a sensing material candidate for ammonium sulfide. Intense chemiluminescence emission can be observed during the catalytic oxidation of ammonium sulfide on the surface of Fe3O4–CNTs composite. Based on this phenomenon, a selective and sensitive gas sensor for the determination of ammonium sulfide was demonstrated. Under the optimized conditions, the linear range of cataluminescence intensity vs concentration of ammonium sulfide gas was 1.4–115 µg mL?1 (R = 0.998) with a limit of detection (S/N = 3) of 0.05 µg mL?1. The relative standard deviation (n = 5) for 14.3 µg mL?1 ammonium sulfide was 1.9%. There was no response to common foreign substances, such as sulfur dioxide, toluene, aether, ethanol, acetone, hydrogen sulfide, carbon bisulfide, benzene and ammonia. The proposed sensor was successfully applied for the determination of ammonium sulfide in artificial air samples. Copyright © 2009 John Wiley & Sons, Ltd. |
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Keywords: | Fe3O4– carbon nanotubes composite cataluminescence ammonium sulfide gas sensor |
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