Titanium dioxide (TiO2) nanofibers were fabricated by electrospinning a hybrid Solution, which is a mixture of the TiO2 sol precursor, polymer, and solvent. The structure and gas sensing properties of TiO2 nanofibers were investigated. By calcining at 600 degrees C, the polymeric components were decomposed and a multi-layered random network structure of TiO2 nanofibers was obtained. Polycrystalline TiO2 nanofibers consist of tetragonal anatase and rutile TiO2 phases. The diameter ranged from 400 nm to 500 nm and the grain size was about 15 nm. The TiO2 nanofibers-based sensor exhibited response to CO concentration as low as 1 ppm at 200 degrees C. (C) 2009 Elsevier B.V. All rights reserved.