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A tri-block copolymer templated synthesis of gold nanostructures

Authors :: Piero Baglioni
Valter Castelvetro
Francesca Ridi
Sabrina Bianchi
Emiliano Fratini
Chiara Vannucci
Ester Falletta
Patrizia Canton
Source :: Journal of colloid and interface science, 357 (2011): 88–94. doi:10.1016/j.jcis.2010.12.074, info:cnr-pdr/source/autori:Falletta, Ester; Ridi, Francesca; Fratini, Emiliano; Vannucci, Chiara; Canton, Patrizia; Bianchi, Sabrina; Castelvetro, Valter; Baglioni, Piero/titolo:A tri-block copolymer templated synthesis of gold nanostructures/doi:10.1016%2Fj.jcis.2010.12.074/rivista:Journal of colloid and interface science (Print)/anno:2011/pagina_da:88/pagina_a:94/intervallo_pagine:88–94/volume:357
Publication Year :: 2011
Publisher :: Elsevier BV, 2011.
Abstract: Stable ultra-small gold nanoparticles have been synthesized in aqueous phase by using a tri-block copolymer (BMB) as a templating agent consisting of two PEG-methylacrylate chains (B blocks) anchored to a poly(methacrylic) moiety containing a trithiocarbonate unit (M block). The effect of the BMB/Au molar ratios on the final particle size, shape and monodispersity has been investigated. The synthesized nanosols have been characterized by means of Visible Absorption, Small Angle X-ray Scattering (SAXS), and Transmission Electron Microscopy (TEM). Results clearly indicate that the polymer plays a key role in determining the size and shape of gold particles, from fractal-like structures to monodisperse spherical particles with a mean diameter of about 3 nm. The aggregation behavior of these nanostructures has been characterized both in solution (SAXS) as well as on mica substrate (AFM) and has been proven to be driven by the polymer to gold concentration ratio. (C) 2010 Elsevier Inc. All rights reserved.