Abstract
In this study, un-doped and Mg doped NiO nanoparticles have been synthesized through a simple sol-gel method. To investigate the effect of Mg-doping on the structure of NiO, the obtained nanoparticles were characterized using scanning electron microscopy (SEM). Flower/star like morphology was clearly observed in the SEM micrographs. The BET (Brunauer-Emmett-Teller) nitrogen absorption isotherm exhibits high specific surface area (∼37 m2 /g) for the Mg doped NiO nanoparticles. X-Ray diffraction (XRD) of the prepared Mg-NiO nanoparticles showed a face-centered cubic (f.c.c) structure, and the average particle size was estimated to be 32 nm using Scherrer’s formula. Energy Dispersive X-Ray (EDX) confirms that the NiO particles are successfully doped with Mg. Photoluminescence (PL) and UV-Vis optical absorption characteristics of the prepared nanoparticles have also been investigated in this study. The PL emission response showed a blue shift when NiO was doped with Mg, which is indicative of interstitial oxygen. The UV-Vis results demonstrate a band gap increase as NiO nanoparticles are doped with Mg.
Highlights
Materials in the form of nanoparticles have attracted interest for physical, chemical, catalytic, magnetic, and optical applications in the recent decades.[1]
The PL emission response showed a blue shift when NiO was doped with Mg, which is indicative of interstitial oxygen
This, combined with the fact that the deep level position is insensitive to the shift of the band edge, leads us to conclude that the green emission originates from electronic transition between the deep defect level and the top of the valence band.[41]
Summary
Materials in the form of nanoparticles have attracted interest for physical, chemical, catalytic, magnetic, and optical applications in the recent decades.[1]. MgO has a face-centered cubic (f.c.c) crystal structure, thermal stability, and insulating behavior with promising applications in electronics as well as in fields in which superior thermal, mechanical, and chemical properties are needed.[14] The properties of these nanoparticles are characterized by their size and shape.[15] In order to optimize their application potential, attempts have been made to develop methods to control the size and morphology of such nanocrystals.[16] As an example, various synthesis methods have been reported for NiO nanoparticles.[17,18,19,20] One of the most common methods to synthesize nanoparticles is called the sol-gel method This method consists of colloidal suspensions (sols) generation which is subsequently converted into viscous gels, and eventually to solids. The morphology and photoluminescence behavior of the prepared nanoparticles were studied to investigate the effect of Mg-doping on the shape and photoluminescence activity of the NiO nanoparticles
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