Study on Green Synthesis of Gold Nanoparticles Using Capsicum Extract
Synthesizing gold nanoparticles with controllable particle size becomes very crutial because many of their properties depend on their particle size.This study employed a green reduction method to synthe-size gold nanoparticles by varifing reaction conditions,with chloroauric acid solution as a precursor and cap-sicum extract as both a protective agent and reducing agent.The synthesized samples were characterized by X-ray diffractometer,infrared spectrometer,UV-Vis spectrometer,Malvern particle size analyzer,transmis-sion electron microscope,field emission scanning electron microscope,and energy disperse spectrometer.The results demonstrate that the gold particles synthesized by this method in the sol are uniform spheroi-dal nanoparticles,and primarily composed of elementary substance gold.In addition,their dispersion is good and particle size is small with an average particle size of about 25 nm,which is a result from SEM analysis.The reaction conditions,including the consumption of capsicum extract and chloroauric acid so-lution,significantly affect the morphology and size of the gold particles in the sol.And the smallest gold nanoparticles can be obtained at room temperature when the consumption of capsicum extract and chloro-auric acid solution is 15 mL and 10 mL,respectively.The capsicum extract contains polyhydroxyl com-pounds that can reduce chlorauric acid to gold atoms and impose an steric effect of long-chain polymers in the extract on the assembly of gold atoms into gold nanoparticles.
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