Effects of ionic surfactants on the morphology of silver nanoparticles using Paan (Piper betel) leaf petiole extract

Stable silver nanoparticles were synthesized by the reduction of silver ions with a Paan (Piper betel) leaf petiole extract in absence and presence of cetyltrimethylammonium bromide (CTAB) and sodium dodecyl sulphate (SDS). The reaction process was simple and convenient to handle, and was monitored using ultraviolet-visible spectroscopy. Absorbance of Ag-nanoparticles increases with the concentrations of Paan leaf extract, acts as reducing, stabilizing and capping agents. The polyphenolic groups of petiole extract are responsible to the rapid reduction of Ag+ ions into metallic Ag0. The results indicated that the shape of the spectra, number of peaks and its position strongly depend on the concentration of CTAB, which played a shape-controlling role during the formation of silver nanoparticles in the solutions, whereas SDS has no significant effect. The morphology (spherical, truncated triangular polyhedral plate and some irregular nanoparticles) and crystalline phase of the particles were determined from transmission electron microscopy (TEM) and selected area electron diffraction (SAED).

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► Much interest has been shown on the green synthesis of silver nanoparticles.
► Surfactant concentrations and reaction time are the important parameters which determined the morphology of silver nanoparticles.
► Peak and shoulder in the UV–Vis spectra is due to the different shape and size of silver nanocrystals.