Effect of Mn doping on the microstructures and sensing properties of ZnO nanofibers

Zinc oxide (ZnO) nanofibers doped with manganese (Mn) are synthesized by electrospinning followed by calcinations at 580 degrees C for 150 min. The structure, morphology and element-composition are investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results show that the diameters of Mn-doped ZnO nanofibers are from 60 nm to 90 nm corresponding to the amount of Mn from 0 wt% to 2.0 wt%, respectively. XPS spectrum indicates that Mn2+ ions exist in divalent state. The gas sensing properties are significantly affected by the Mn-doped ZnO nanofibers and the operation temperature. The sensors exhibit excellent sensitivity, practical selectivity and stability to acetone with a fast response and recovery time at 340 degrees C. (C) 2014 Elsevier B.V. All rights reserved.