Enhanced Gas Sensing Properties of Aligned Porous SnO₂ Nanofibers

Aligned porous SnO₂ nanofibers are obtained by electrospinning with the collector of parallel wedge-shaped electrodes and then by oxygen plasma treatment and annealing. The morphology and crystal structure of the fibers are analyzed by scanning electron microscopy and x-ray diffraction, and the effects of the morphology and alignment on ethanol sensing properties of the fibers are investigated. The results show that the porous SnO₂ fibers with an average diameter of tens of nanometers can be deposited orderly on the micro-hotplate with the auxiliary electrodes. The aligned porous fibers exhibit higher sensitivity and faster response compared with randomly oriented ones at the operating temperature of 300°C.