Mn-doped ZnO nanorod gas sensor for oxygen detection

In this work, we have used resistive sensor measurements regarding the oxygen gas sensitivity of un-doped and Mn-doped ZnO nanorods prepared by microwave-hydrothermal method. X-ray diffraction (XRD) results indicated that the Mn-doped ZnO nanorods have single phase nature with the wurtzite structure. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) results suggested that Mn-doped ZnO nanorods possessed higher aspect ratio (27) than un-doped ZnO (24). The selected area electron diffraction (SAED) pattern inferred that the ZnO nanorods have single crystalline nature with preferentially growth along [001] direction. Raman scattering spectra of Mn-doped ZnO nanorods revealed the modification in E-2 (high) mode that is related to the vibration of oxygen atoms in wurtzite ZnO, suggested the successful doping of Mn into Zn site in ZnO. The gas sensing properties measured at room temperature revealed that the Mn-doped ZnO nanorods exhibited high sensitivity as compared to un-doped ZnO. (C) 2013 Elsevier B.V. All rights reserved.