title: Synthesis and characterization of high concentration block copolymer-mediated gold nanoparticles.
abstract: The formation of high concentration gold nanoparticles at room temperature is reported in block copolymer-mediated synthesis where the nanoparticles have been synthesized from hydrogen tetrachloroaureate(III) hydrate (HAuCl(4)·3H(2)O) using block copolymer P85 (EO(26)PO(39)EO(26)) in aqueous solution. The formation of gold nanoparticles in these systems has been characterized using UV-visible spectroscopy and small-angle neutron scattering (SANS). We show that the presence of additional reductant (trisodium citrate) can enhance nanoparticle concentration by manyfold, which does not work in the absence of either of these (additional reductant and block copolymer). The stability of gold nanoparticles with increasing concentration has also been examined.
authors.affiliation: Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
authors.forename: Debes
authors.initials: D
authors.lastname: Ray
authors.forename: Vinod K
authors.initials: VK
authors.lastname: Aswal
authors.forename: Joachim
authors.initials: J
authors.lastname: Kohlbrecher
mesh_terms: D002951:Citrates / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D011108:Polymers / Q000737:chemistry*; D053838:Scattering, Small Angle; D013696:Temperature
chemical_list: D002951:Citrates; D011108:Polymers; C514290:trisodium citrate; D006046:Gold