Novel synthesis and characterization of gold-platinum core-shell nanoparticles using green tea leaves extract
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In the current study, core-shell Au-Pt nanoparticles (Au@Pt NPs) have been successfully synthesized via a new, facile and environmentally friendly approach, in which a Pt shell grown on an Au core surface by using green tea leaves extract as both a reducing and stabilization reagent. We have systematically studied the effects of the molar ratio between Au and Pt on the formation of the Au@Pt NPs. The molar ratio between Au and Pt is effectively controlled by changing the precursor solution ratios of HAuCl 4 and H 2 PtCl 6 in the reaction solution, leading to controllable size. The surface morphology, crystalline structure and optical properties of the Au@Pt NPs are characterized by field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD), dynamic light scattering (DLS), UV-Vis spectroscopy. These results confirm that the Au@Pt nanoparticles are successfully prepared using a simple on-step method. The gold-platinum core-shell nanoparticles with molar ratio of (2:1) reveal good morphology, homogeneity in size and stability in comparison with the other synthesized Au@Pt NPs.
