title: Shape-directing role of cetyltrimethylammonium bromide in the preparation of silver nanoparticles.
abstract: We report a simple chemical reduction method for the synthesis of different colored silver nanoparticles, AgNP, using tyrosine as a reducing agent. Effects of cetyltrimethylammonium bromide, CTAB, and tyrosine concentrations are analyzed by UV-visible measurements and scanning electron microscopy (SEM) to evaluate the mode of AgNP aggregation. The position and shape of the surface resonance plasmon absorption bands strongly depend on the reaction conditions, i.e., [CTAB], [tyrosine], and reaction time. Sub-, post-, and dilution-micellar effects are accountable for the fast and slow nucleation and growth processes. Spectrophotometric measurement also shows that the average size and the polydispersity of AgNP increase with [CTAB] in the solution. CTAB acted as a shape-directing agent.
authors.affiliation: Department of Chemistry, Jamia Millia Islamia, Central University, New Delhi 110 025, India. drkhanchem@yahoo.co.in
authors.forename: Zaheer
authors.initials: Z
authors.lastname: Khan
authors.forename: Shaeel Ahmed
authors.initials: SA
authors.lastname: Al-Thabaiti
authors.forename: Abdullah Yousif
authors.initials: AY
authors.lastname: Obaid
authors.forename: Ziya Ahmad
authors.initials: ZA
authors.lastname: Khan
authors.forename: Abdulrahman A O
authors.initials: AA
authors.lastname: Al-Youbi
mesh_terms: D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000191:economics / Q000379:methods; D010084:Oxidation-Reduction; D010316:Particle Size; D019163:Reducing Agents / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D014443:Tyrosine / Q000737:chemistry*
chemical_list: D002593:Cetrimonium Compounds; D019163:Reducing Agents; D012834:Silver; D014443:Tyrosine; D000077286:Cetrimonium