Single step synthesis and organization of gold colloids assisted by   copolymer templates
  We report here an original single-step process for synthesis and self-organization of gold colloids by simply incorporating gold salts into a solution prepared with Polystyrene (PS) - Polymethylmethacrylate (PMMA) copolymer, thiolated PS and Propylene Glycol Methyl Ether Acetate (PGMEA) as solvent. The spin-coating and annealing of this solution allows then the formation of PS domains. Depending on the polymer concentration of the as-prepared solution, there can be either one or several gold nanoparticles (NPs) per PS domains. For high concentration of gold nanoparticles in PS domains, the coupling between plasmonic nanoparticles leads to the observation of second peak in the optical extinction spectrum. Such collective effect could be relevant for the development of optical strain sensors in the next future. 
Aurelien Sarrazin, Arthur Gontier, Alexandre Plaud, Jeremie Beal,   Helene Yockell-Lelievre, Jean-Louis Bijeon, Jerome Plain...
cond-mat.mtrl-sci