ZnO CO-DOPED WITH Ni AND Mg: PREPARATON BY COPRECIPITATION, CHARACTERISATION AND EFFECT OF AMOUNT OF THE CO-DOPANTS ON THE BANDWIDTH OF ZnO

K. M. Sreedhar, Sangeeth Sivan, Karthik Raja, Kirti Suresh, R. Sreelekshmi, Appu Palat, K. M. Sreekanth
2021 RASAYAN Journal of Chemistry  
Owing to the significance of semiconducting transition metal oxides, doped with transition metals, in the area of spintronics, we prepared zinc oxide co-doped with nickel and magnesium, following chemical co-precipitation strategy. Since our focus was also to look at the effect of the amount of the co-dopants on the bandwidth of zinc oxide, we prepared six different samples of zinc oxide co-doped with nickel and magnesium, varying the amount of the co-dopants. The prepared samples were
more » ... mples were characterized following Energy Dispersive X-ray Analysis, powder Xray Diffraction Analysis and solid-state UV-visible spectral analysis. The Tau plots were utilized for the determination of the band width of all the prepared samples. The bandwidth of all the prepared samples thus obtained was compared with the bandwidth of pure undoped zinc oxide. For this, we also prepared pure undoped zinc oxide following a chemical precipitation strategy. It was observed that the bandwidth of all the prepared samples, zinc oxide co-doped with nickel and magnesium, is greater than that of the pure undoped zinc oxide that we prepared. Again, we observed that the bandwidth of pure zinc oxide increases as the amount of nickel and magnesium in the crystal lattice of zinc oxide increases. ZnO CO-DOPED WITH Ni AND Mg K. M. Sreedhar et al. CONCLUSION Ni and Mg co-doped ZnO were prepared following a chemical co-precipitation strategy. The co-doped samples were prepared to vary the amount of Ni and Mg. Pure undoped ZnO was also prepared to adopt a chemical precipitation strategy. The co-doped samples were characterized by EDAX, powder XRD and UV-visible analysis. The EDAX revealed the presence of S in the crystal lattice of co-doped ZnO. The XRD supports this observation revealing the presence of the phase Zn3O(SO4)2 in the co-doped samples. The 2θ corresponding to (101) plane of pure undoped ZnO that we prepared is 36.45 0 . Concerning this value, all the prepared co-doped samples showed a shift in the peak towards the lower angle, revealing that the dopants Ni and Mg are well incorporated in the crystal lattice of ZnO. On co-doping, the bandwidth of ZnO increases concerning that of pure undoped ZnO that we prepared. The bandwidth of the prepared co-doped samples was found to increase as the amount of the co-dopants increases.
doi:10.31788/rjc.2021.1426031 fatcat:ez7b25ugrrhuzjblgvjtakejkq