Parallel-aligned zinc oxide (ZnO) nanofibrous films fabricated by using electrospinning technique were used in gas sensors for the detection of ethanol and formaldehyde. The morphologies and crystal structures of the films were characterized by field-emission scanning electron microscopy (FEa€“SEM) and X-ray diffraction (XRD), respectively. FEa€“SEM results showed that ZnO nanofibres had an approximate diameter of 100a€“300 nm and consisted of hexagonal wurtzite structure ZnO nanocrystals with a primary particle diameter of 20a€“50 nm. The results of resistancea€“temperature characteristics and responses to ethanol and formaldehyde indicated that the parallelaligned ZnO nanofibrous film had a low activation energy (0.246 eV), a low optimum operating temperature and a high response. The response and recovery had a high rate in the initial stage and a low rate in the later stage. The parallel-aligned ZnO nanofibrous film had excellent potential application for formaldehyde sensor.
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