title: Green synthesis of size controllable gold nanoparticles.
abstract: A facile rapid green eco-friendly method to synthesize gold nanoparticles (Au NPs) of tunable size using aqueous Terminalia arjuna fruit extracts has been demonstrated herein. Formation of Au NPs was confirmed by Surface Plasmon Resonance (SPR) study at 528 nm using UV-visible spectrophotometer. The time of reduction, size and morphological variations of Au NPs were studied with varying quantities of T. arjuna fruit aqueous extracts. Synthesized Au NPs were characterized using UV-visible spectroscopy, Fourier transformed infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD), transmission electron microscopy (TEM) and Energy dispersive X-ray spectroscopy (EDAX). Polyphenols responsible for reduction of Au(3+) to Au(0) were identified using High Performance Liquid Chromatography (HPLC) as ascorbic acid, gallic acid and pyrogallol. The oxidized forms of polyphenols formed coordination with surface of Au NPs which protected their further growth and aggregation. We also propose a plausible mechanism how to tune size and shape of Au NPs by varying the quantity of extracts. Thus obtained Au NPs were stable for more than four months.
authors: Trace Elements Speciation Research Laboratory, Environmental and Analytical Chemistry Division, School of Advanced Sciences, VIT University, Vellore 632014, India; Department of Basic Science, Madanapalle Institute of Technology, Madanapalle 517 325, Andhrapradesh, India.
authors: Kesarla
authors: K
authors: Mohan Kumar
authors: Badal Kumar
authors: BK
authors: Mandal
authors: Hoskote A
authors: HA
authors: Kiran Kumar
authors: Sireesh Babu
authors: SB
authors: Maddinedi
mesh_terms: D006046:Gold / Q000737:chemistry*; D055772:Green Chemistry Technology / Q000191:economics / Q000379:methods*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction; D010316:Particle Size; D010936:Plant Extracts / Q000737:chemistry*; D059808:Polyphenols / Q000737:chemistry*; D029766:Terminalia / Q000737:chemistry*
chemical_list: D010936:Plant Extracts; D059808:Polyphenols; D006046:Gold
keywords: Anisotropic; Au NPs; Oxidized polyphenol; Polyphenol ligands; T. arjuna