Abstract
Microwave assisted shape-selective synthesis of gold nanoparticles has been achieved in a short reaction time of 6 min. Shape of the gold nanoparticles has been found to be tuneable among truncated cube, cube, tetrahedral and octahedral by changing the concentration of aqueous NaOH into the reaction mixture containing HAuCl4, N,N-dimethylformamide (DMF) and polyvinylpyrrolidone (PVP) under microwave irradiation. The preferential adsorption of sodium ions on gold surface during crystal growth controls the shape of the nanoparticles. The chemical state, crystallographic structure, elemental composition and morphology of the as-prepared gold nanoparticles were analyzed using respective XPS, powder XRD, EDS and FEG-SEM analytical techniques. Catalytic performance and recyclability of the as-prepared gold nanoparticles were examined towards the reduction of p-nitroaniline into p-phenylenediamine using sodium borohydride and continuous monitoring the reaction progress using UV-Visible spectrophotometer under ambient conditions.
Published Version
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