title: Synthesis, characterization and SERS activity of biosynthesized silver nanoparticles.
abstract: Silver nanoparticles were rapidly synthesized using Moringa oleifera flower extract as the reducing agent shows surface plasmon resonance peak at 439nm. The size and shape of the nanoparticles controlled by varying the concentration of M. oleifera flower extract in the reaction medium. The synthesized silver nanoparticles were well-dispersed spherical nanoparticles with the average size of 14nm. The retinoic acid present in M. oleifera flower extract used as reducing agent and proteins was responsible for capping of the bioreduced silver nanoparticles. The obtained nanoparticle shows size-dependent SERS activity. The SERS spectrum indicates that the pyridine adsorbed on the silver surface in a stand-on orientation via its nitrogen lone pair electrons.
authors.affiliation: Department of Physics, Mother Teresa Women's University, Kodaikanal 624 101, Tamil Nadu, India.
authors.forename: M R
authors.initials: MR
authors.lastname: Bindhu
authors.forename: V
authors.initials: V
authors.lastname: Sathe
authors.forename: M
authors.initials: M
authors.lastname: Umadevi
mesh_terms: D000042:Absorption; D000327:Adsorption; D035264:Flowers / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D029587:Moringa / Q000737:chemistry*; D055620:Optical Phenomena; D010936:Plant Extracts / Q000737:chemistry; D011725:Pyridines / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D014732:Vibration; D014961:X-Ray Diffraction
chemical_list: D010936:Plant Extracts; D011725:Pyridines; D012834:Silver; C023666:pyridine
keywords: Moringa oleifera; Pyridine; Retinoic acid; Surface Enhanced Raman Spectroscopy; Surface plasmon resonance