Controlled Synthesis of Gold Nanoparticles in Copolymers Nanomolds by X-ray Radiolysis

• DOI: 10.1021/acs.langmuir.0c00554
• Publication Date: 2020-05-12T00:46:27Z
• Authors: Louis Bondaz; Philippe Fontaine; François Muller; Nadège Pantoustier; Patrick Perrin; Isabelle Morfin; Michel Goldmann; Fabrice Cousin
• Keywords: [PHYS]Physics [physics]; [CHIM]Chemical Sciences; 540; 01 natural sciences; 0104 chemical sciences

We show by X-ray and neutron small-angle scattering that gold nanoparticles with controlled sizes morphologies can be obtained the metallic reduction of AuCl4– ions trapped in 3D organic molds radiolysis. The are spherical frozen micelles polystyrene-b-poly(dimethylaminoethyl methacrylate) (PS-b-PDMAEMA) block copolymer acidic aqueous solution a PS core surrounded corona PDMAEMA chains good solvent. behavior is [AuCl4–]/[DMAEMA] ratio RAuCl4–/DMAEMA. At low concentration, condense on positively charged DMAEMA moieties without changing chains. intermediate induce progressive contraction corona's dehydration micelles. large becomes fully dry phase loaded ions, which induces micelle aggregation. Radiolysis an intense beam produces different types respect to RAuCl4–/DMAEMA irradiation time. = 0.033, first step clusters second merge form similar size micelle. Conversely, at 0.33, do not operate as templates but only nucleation zones grow outside