Abstract
Pure and Ce-doped ZnO nanofibers were synthesized by the electrospinning method, and then characterized via X-ray diffraction and scanning electron microscopy. The results showed that the porous nanofibers were composed of particles with diameters around 20–30nm and Ce-doping caused a decrease in the diameters of ZnO nanofibers. The acetone sensing properties of the sensor based on the nanofibers were investigated. Comparing with pure ZnO nanofibers sensor, Ce-doped ZnO nanofibers sensor exhibits better sensing properties than those to acetone. Moreover, this sensor has an optimum operating temperature of 230°C, considerable sensitivity, quick response and good selectivity. The response and recovery time are about 8s and 5s, respectively. The high response and quick response/recovery time can be attributed to the large surface area and the enhancement of adsorption ability of surfaces in Ce-doped ZnO nanofibers. The gas sensing mechanism is also discussed.
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