title: Au(III)-CTAB reduction by ascorbic acid: preparation and characterization of gold nanoparticles.
abstract: Upon addition of tetrachloroauric(III) (HAuCl(4)) to a solution of cetyltrimethylammonium bromide (CTAB), a perfect transparent yellow colored and yellowish-precipitate appears within the time of mixing, indicating the formation of a complex between HAuCl(4) and CTAB. Morphology of gold nanoparticles in situ via chemical reduction of title reaction has been determined by using conventional techniques. The position and shape of the surface plasmon resonance (SRP) band strongly depends on the [ascorbic acid], [HAuCl(4)], [CTAB] and mixing ratio of the reactants. Sub-, post- and dilution-micellar effects are accountable to the aggregation and/or adsorption of gold nanoparticles onto the surface of CTAB. The morphology of particles was altered by changing the [reactants] as well as [CTAB]. A mechanism of nanoparticle formation has been proposed comprising different steps of particle growth.
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: Athar Adil
authors.initials: AA
authors.lastname: Hashmi
mesh_terms: D001205:Ascorbic Acid / Q000737:chemistry*; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010316:Particle Size; D013499:Surface Properties
chemical_list: D002593:Cetrimonium Compounds; D006046:Gold; D001205:Ascorbic Acid; D000077286:Cetrimonium