Pure SnO 2 and SnO 2 polycrystalline nanofibers doped with multiwall carbon nanotubes ͑MWCNTs͒ are synthesized by electrospinning followed by calcination in air at 500°C. The measurement results by sensors fabricated from these fiber mats at steady state show that the n-type SnO 2 /MWCNT nanofibers are able to detect carbon monoxide at 50 ppm at room temperature, while the pure SnO 2 nanofibers are insensitive up to 500 ppm. The MWCNT doped SnO 2 nanofibers have demonstrated their potentials for wearable room temperature gas sensors with low cost and power consumption.

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