Morphology evolution of gold nanoparticles as function of time, temperature, and Au(III)/sodium ascorbate molar ratio
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In this work the morphology evolution of Au nanoparticles (AuNPs), obtained by direct reduction, was studied as a function of time, temperature, and Au(III)/sodium ascorbate molar ratio. The NPs morphology was examined by transmission electron microscope with image analysis, while time evolution was investigated by visible and near-infrared absorption spectroscopy and dynamic light scattering. It is found that initially formed star-like NPs transform in more spheroidal particles and the evolution appears more rapid by increasing the temperature while a large amount of reducing agent prevents the remodeling of AuNPs. An explication of morphology evolution is proposed.
KeywordsGold nanoparticles Star-like morphology Crystal growth Multi-twinned particles NPs nucleation NPs morphology evolution
The authors would like to thank all the students of “De Pretto” Technical Institute (Schio, Italy) who participated in this work by providing a valuable technical support.
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Conflict of interest
The authors declare that they have no potential conflict of interest.
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