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Sn-SnO"2/carbon heterostructure nanofibers were synthesized by electrospinning and following heat treatment, and their C"2H"5OH sensing properties were studied. The hetero-nanofibers composed of amorphous carbon and homogeneously distributed Sn-SnO"2 particles were characterized by SEM, TEM, EDS, XRD, XPS, FT-IR, Raman and nitrogen adsorption-desorption experiment. A gas sensor was fabricated from the as-synthesized heterostructures of Sn-SnO"2/carbon nanofibers and used to test the sensing performance to C"2H"5OH. The Sn-SnO"2/carbon nanofibers showed improved sensing properties compared to pure SnO"2 nanofibers. It exhibits a 2-time enhancement in ethanol response compared to the SnO"2 nanofibers counterparts at its optimum operating temperature, good linear dependence of response on C"2H"5OH concentration in the range of 10-100ppm, excellent recovery property and selectivity to C"2H"5OH. The excellent performance in C"2H"5OH sensing of Sn-SnO"2/carbon nanofibers arises from (i) high specific surface and pore structure provided by one-dimensional carbon nanofibers, (ii) the unique sensing mechanism based on the hybrid Sn-SnO"2/carbon nanostructures.
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