8.4.4 Enhanced H2S Sensing Properties of Porous SnO2 Nanofibers Modified with CuO

Porous SnO2 nanofibers were fabricated by electrospinning and oxygen plasma treatment. Subsequently, CuO was sputtered on the porous SnO2 fibers as the modifier. H2S sensing properties of the fibers were tested and the effect of CuO amount on the response and recovery characteristics to H2S was investigated. It was found that the response is strongly dependent on the CuO amount and the response time and recovery time become longer with the increase of the CuO amount. The highest response of the fibers to 2 ppm H2S attains 1.9×10 3 at the operating temperature of 100� with the optimum CuO thickness of 24 nm, and the fibers show good selectivity to H2S.

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