Abstract
We report a simple biomimetic chemical reduction method for the preparation of orange-red color silver sol in absence and presence of cetyltrimethylammonium bromide (CTAB), at room temperature. Silver nitrate and lotus leaf extract were taken as the metal precursor and reducing agent. As the reaction proceeds, a typical plasmon absorption band in 400 to 550nm range appears for the silver nanoparticles and the intensities increase with the time and [reactants]. UV–visible spectroscopy, transmission electron microscopy (TEM) and selected areas electron diffraction (SAED) were used to characterize the silver sol. TEM images show that the silver sol consists of aggregated, cross-linked and inter-connected arrangement of spherical and truncated nanoplates, and irregular silver nanoparticles. The dependency of position and shape of the absorption band on CTAB concentration infers that it acts as a shape-directing, cross-linking and stabilizing agent during the growth of different shape and size of silver nanoparticles.
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