Zinc Oxide (ZnO) is one of the most important II-VI group elements with wide band gap (3.37 eV) possessing size  tunable optical transitions in solar cell, optoelectronics and wider range of application [1-2]. In this paper we report the structural and optical properties of Fe-doped ZnO Nanoparticles (NP) by solution combusting method. In a typical synthesis [2], 0.05M of zinc acetate dihydrate was dissolved in 100 mL of mixed solvent of ethanol and ethyleneglycol with a volume ratio of 60:40. Then, different mill mole of Ferrous Sulfate (0.5, 1, 2, 5 and 10 mmol) was introduced into the above solution under constant magnetic stirring. The solution was transferred into a spirit lamp with an absorbent cotton lampwick and then the sprite lamp was fired. After the lampwick was extinguished, the samples were repeatedly dispersed into distilled water to wash and remove the impurity by ultrasonic process. Finally, the sample was dried at 150°C in hot air oven for 24 h. Powder X-Ray Diffraction (XRD), Field Emission- Scanning Electron Microscopy (FE-SEM), Raman and Photoluminescence (PL) spectrum were employed to characterize the structural, morphology and optical studies of pure and Fe-doped ZnO NP. The Rietveld refinement analysis of XRD data indicates that the particles are in the hexagonal wurtzite structure. The average particle size is around 80 nm which is confirmed by FE-SEM. Presence of some bigger particles might be attributed to   aggregating or overlapping of smaller particles. Raman spectra of the Fe doped ZnO NP show remarkable effect on the polar as well as non-polar branches. The PL spectra indicates that blue shift of the UV-emission have occurred in Fe-doped sample due to Burstein-Moss effect.

References:

[1]   J.J. Cole, X. Wang, R. J. Knuesel R J,H. O. Jacobs, Nano Lett. 8 (2008)1477.

[2]   Y. Ni, X. Cao, G. Wu, G. Hu, Z. Yang, X. Wei, Nanotechnology 18 (2007)1556.

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