A tri-block copolymer templated synthesis of gold nanostructures

作者：Falletta Ester; Ridi Francesca; Fratini Emiliano; Vannucci Chiara; Canton Patrizia; Bianchi Sabrina; Castelvetro Valter; Baglioni Piero^*

来源：Journal of Colloid and Interface Science, 2011, 357(1): 88-94.

DOI：10.1016/j.jcis.2010.12.074

• Gold nanoparticles
• Block copolymer
• Capping agent
• SAXS
• AFM
• TEM

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.

• 出版日期2011-5-1