Ligand-free synthesis of gold nanoparticles incorporated within oriented cylindrical block copolymer films : towards optical metamaterials

Florian Aubrit (1, 2) , Fabienne Testard (2) , Aurélie Paquirissamy (2) , Frédéric Gobeaux (2) , Xuan Wang (1) , Frédéric Nallet (3) , Philippe Fontaine (4) , Virginie Ponsinet (3) , Patrick P. Guenoun (2)

1 CRPP - Centre de Recherche Paul Pascal
2 LIONS - Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire
3 CRPP - Centre de recherches Paul Pascal
4 SSOLEIL - Synchrotron SOLEIL

We report a method to incorporate non-functionalized gold nanoparticles (AuNPs) in oriented cylindrical phases of poly(styrene)-b-poly(vinylpyridine) (PS-b-PVP) block copolymers, perpendicular to a substrate. The combination of AFM, TEM, GISAXS and spectroscopy allows complete characterization of the nanocomposites. AuNPs are produced by the ultra-sound reduction of a gold salt in the copolymer solution, prior to the deposition of the films by spin-coating. The AuNPs are found to be located within the PVP cylinders exclusively. The seeded-growth of these pre-formed AuNPs by a further ultra-sound treatment produced plasmonic AuNPs (up to d =10 nm). For perpendicular cylinders, the PVP domains are swollen without any change in their orientation. Ellipsometric optical properties of these plasmonic AuNPs embeded into oriented cylinders show a definite extinction in reflectivity at a precise energy and incidence angle.

Domains: Material chemistry

Florian Aubrit, Fabienne Testard, Aurélie Paquirissamy, Frédéric Gobeaux, Xuan Wang, et al.. Ligand-free synthesis of gold nanoparticles incorporated within oriented cylindrical block copolymer films : towards optical metamaterials. META 2019. The 10th International Conference on Metamaterials, Photonic Crystals and Plasmonics, Jul 2019, Lisbon, Portugal. ⟨cea-02328369⟩