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Investigation of the H 2 S poisoning process for sensing composite material based on carbon nanotubes and metal oxides.
Sensors and Actuators. B, Chemical 2016 November 2
The poisoning of H2 S sensing material based on the mixture of acid-treated carbon nanotubes, CuO and SnO2 was investigated by exposing the material to high doses of H2 S (1% in volume) and following the changes spectroscopically. The presence of metal sulfides (CuS and SnS2 ), sulfates and thiols was confirmed on the surface of this material as the result of H2 S poisoning. Further study revealed that leaving this material in air for extended period of time led to reoxidation of metal sulfides back to metal oxides. The formation of thiols and sulfates directly on carbon nanotubes is not reversible under these conditions; however, the extent of the overall surface reaction in this case is substantially lower than that for the composite material.
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