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Figure (a)showing UV–Vis spectra of selenium nanoparticles measured at the time of reaction of sodium citrate with inaqueous solution. The inset is a plot of maximum absorbance versus time of reaction for selenium solution and also the color change of solution before and after addition of sodium citrate (b)XRD pattern of selenium nanoparticles synthesized by sodium citrate. The principal Bragg reflections are identified.
