Abstract
Shape of the surface resonance Plasmon band of silver nanoparticle depends on the concentrations of cetyltrimethylammonium bromide. [Display omitted]
► Silver nanoparticles have been synthesized in water by using tyrosine. ► Pre-, post-, and dilution-micellar effects are responsible for the different morphology of silver nanoparticles. ► Absorbance of surface resonance plasmon band decreases with tyrosine concentrations. ► Size, shape, and anisotropy strongly depend on the adsorption of ions onto the different faces of particles.
We report a simple chemical reduction method for the synthesis of different colored silver nanoparticles, AgNP, using tyrosine as a reducing agent. Effects of cetyltrimethylammonium bromide, CTAB, and tyrosine concentrations are analyzed by UV–visible measurements and scanning electron microscopy (SEM) to evaluate the mode of AgNP aggregation. The position and shape of the surface resonance plasmon absorption bands strongly depend on the reaction conditions, i.e., [CTAB], [tyrosine], and reaction time. Sub-, post-, and dilution-micellar effects are accountable for the fast and slow nucleation and growth processes. Spectrophotometric measurement also shows that the average size and the polydispersity of AgNP increase with [CTAB] in the solution. CTAB acted as a shape-directing agent.