Structural, optical and magnetic properties of Cr doped ZnO microrods prepared by spray pyrolysis method |
| |
Authors: | S Y?lmaz M Parlak? Özcan M Altunba?E McGlynn E Bacaks?z |
| |
Institution: | a Department of Physics, Karadeniz Technical University, 61080 Trabzon, Turkey b Department of Physics, Middle East Technical University, 06531 Ankara, Turkey c SNTG Lab., Physics Engineering Department, Hacettepe University, Beytepe, 06800 Ankara, Turkey d School of Physical Sciences, National Centre for Plasma Science and Technology, Dublin City University, Glasnevin, Dublin 9, Ireland |
| |
Abstract: | A series of Cr-doped ZnO micro-rod arrays were fabricated by a spray pyrolysis method. X-ray diffraction patterns of the samples showed that the undoped and Cr-doped ZnO microrods exhibit hexagonal crystal structure. Surface morphology analysis of the samples has revealed that pure ZnO sample has a hexagonal microrod morphology. From X-ray photoelectron spectroscopy studies, the Cr 2p3/2 binding energy is found to be 577.3 eV indicating that the electron binding energy of the Cr in ZnO is almost the same as the binding energy of Cr3+ states in Cr2O3. The optical band gap Eg decreases slightly from 3.26 to 3.15 eV with the increase of actual Cr molar fraction from x = 0.00 to 0.046 in ZnO. Photoluminescence studies at 10 K show that the incorporation of chromium leads to a relative increase of deep level band intensity. It was also observed that Cr doped samples clearly showed ferromagnetic behavior; however, 2.5 at.% Cr doped ZnO showed remnant magnetization higher than that of 1.1 at.% and 4.6 at.% Cr doped samples, while 4.6 at.% Cr doped ZnO samples had a coercive field higher than the other dopings. |
| |
Keywords: | Cr:ZnO Micro rod XPS Photoluminescence Ferromagnetism |
本文献已被 ScienceDirect 等数据库收录! |
|