title: Starch-directed green synthesis, characterization and morphology of silver nanoparticles.
abstract: Silver nanoparticles were prepared by a simple chemical reduction method using ascorbic acid and starch as reducing and stabilizing agents, respectively. The effect of starch, silver ions and ascorbic acid was studied on the morphology of the silver nano-particles using UV-visible spectrophotometry. The initial reaction time min and amount of starch were important parameters for the growth of Ag-nanoparticles. The morphology was evaluated from transmission electron microscopy (TEM). The truncated triangle nano-plates (from 17 to 30 nm), polyhedron, spherical with some irregular shaped Ag-nanoparticles were formed in presence of starch. Particles are aggregated in an irregular manner, leads to the formation of butterfly-like structures of silver. Starch acts as a stabilizing, shape-directing and capping agent during the growth processes. Silver nanoparticles adsorbed electrostatically on the outer OH groups of amylose left-handed helical conformation in solution.
authors.affiliation: Nanoscience Research Laboratory, Department of Chemistry, Jamia Millia Islamia (Central University), New Delhi 110025, India. drkhanchem@yahoo.co.in
authors.forename: Zaheer
authors.initials: Z
authors.lastname: Khan
authors.forename: Taruna
authors.initials: T
authors.lastname: Singh
authors.forename: Javed Ijaz
authors.initials: JI
authors.lastname: Hussain
authors.forename: Abdullah Yousif
authors.initials: AY
authors.lastname: Obaid
authors.forename: Shaeel Ahmed
authors.initials: SA
authors.lastname: Al-Thabaiti
authors.forename: E H
authors.initials: EH
authors.lastname: El-Mossalamy
mesh_terms: D001205:Ascorbic Acid / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D046529:Microscopy, Electron, Transmission; D012834:Silver / Q000737:chemistry*; D013213:Starch / Q000737:chemistry*
chemical_list: D012834:Silver; D013213:Starch; D001205:Ascorbic Acid