Abstract
Highly branched gold nanoflowers are synthesized in high yield by a simple amino-reducingmethod, without additional seeds or surfactant agents. We present a systematicinvestigation of the influence of different parameters on the size, morphology, andmonodispersity of gold nanoflowers. The initial concentration of reducing agent, the solventviscosity, and the reaction temperature play critical roles in the formation ofnanoparticles. A lower concentration of reducing agent causes larger particles withsharp and dendritic tips. Moreover, with increasing solvent viscosity, the obtainedparticles have more and larger tips. Examination of the nanoparticles at differentreaction stages with transmission electron microscopy and UV–vis spectroscopyreveals the formation of the gold nanoflowers as a classical growth process in whichdiffusion-controlled growth gives rise to the highly branched structures. Additionally,these gold nanoflowers have prospects for surface-enhanced Raman scattering(SERS) imaging because of their strong SERS enhancement and clean surface.
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