Interpretation of Localized Surface Plasmonic Resonances of Gold Nanoparticles Covered by Polymeric Coatings

Plasmonic materials currently have a plethora of applications. How would dielectric matrix, such as diblock copolymers, tune plasmonic properties? In this work, self-assembled gold nanoparticles were fabricated in medium vacuum conditions on heated Corning glass substrates (kept at 440 °C) under the coexistence argon and air by means DC magnetron sputtering. These samples compared structurally optically to deposited room temperature post annealed. Subsequently, better two preparations, those glass, covered with three different polymers, namely: Polystyrene-block-polybutadiene-block-polystyrene (PS-b-PBD-b-PS); Polystyrene-co-methyl methacrylate (PS-co-PMMA); Polystyrene-block-polyisoprene-block-polystyrene (PS-b-PI-b-PS), spin coating. Localized surface plasmon resonances recorded analyzed, respectively, for polymer-covered nanoparticles, width, intensity, position changing according multiple factors, size refractive index each polymer. Lastly, purposes justification comparison experimental results, rigorous theoretical calculations been carried out.