Abstract
A facile one-pot approach for synthesis of gold nanoparticles with narrow size distribution and good stability was presented by reducing chloroauric acid with a polysaccharide, konjac glucomannan (KGM) in alkaline solution, which is green and economically viable. Here, KGM served both as reducing agent and stabilizer. The effects of KGM on the formation and stabilization of as-synthesized gold nanoparticles were studied systematically by a combination of UV-visible (UV-vis) absorption spectroscopy, transmission electron microscopy, X-ray diffraction, dynamic light scattering, and Fourier transform infrared spectroscopy. Furthermore, the gold nanoparticles exhibited a notable catalytic activity toward the reduction of 4-nitrophenol to 4-aminophenol.
Highlights
In the recent years, noble metal nanoparticles, especially gold nanoparticles (AuNPs), have attracted great interest and wide attention
Synthesis of AuNPs in aqueous konjac glucomannan (KGM) solution The formation of gold nanoparticles by reduction of HAuCl4 with KGM was investigated by UV-vis spectra at different reaction times
The possible reason is that the growth process of KGM-capped gold nanoparticles was complicated since there are various interactions occurring simultaneously
Summary
Noble metal nanoparticles, especially gold nanoparticles (AuNPs), have attracted great interest and wide attention. The preparation and potential applications of AuNPs are becoming increasingly popular among researchers due to their distinctive optical properties, tuneable surface plasmon resonance. A number of chemical and physical methods for synthesis of metal nanoparticles have been reported, such as chemical reduction, electro-reduction, photoreduction, and heat evaporation [4,5,6]. Require rather complex procedures or rigorous conditions, followed by surface modification with some protecting ligands like thiols and oleic acid.
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