Pure and Co-doped SnO2 nanofibers are synthesized via an electrospinning method and characterized by X-ray diffraction (XRD) scanning electron microscopy (SEM) and transmission electron microscope (TEM) Comparing with pure SnO2 nanofibers Co-doped SnO2 nanofibers exhibit improved H-2 sensing properties Among all the samples (pure 05 wt% 1 wt% and 3 wt% Co-doped SnO2 nanofibers) 1 wt% Co-doped SnO2 nanofibers show the highest response with very short response/recovery times The response is up to 24 when the corresponding sensor is exposed to 100 ppm H-2 at 330 C and the response and recovery times are 2 and 3s respectively Good selectivity is also observed in our investigation These results make Co-doped SnO2 nanofibers good candidates for fabricating high performance H-2 sensors in practical (C) 2010 Elsevier BV All rights reserved