Janus gold nanoparticles obtained via spontaneous binary polymer shell segregation

Janus gold nanoparticles are of high interest because they allow directed self-assembly and display plasmonic properties. We succeeded in coating gold nanoparticles with two different polymers that form a Janus shell. The spontaneous segregation of two immiscible polymers at the surface of the nanoparticles was verified by NOESY NMR and most importantly by electron microscopy analysis in two and three dimensions. The Janus structure is additionally shown to affect the aggregation behavior of the nanoparticles. ¸ The Royal Society of Chemistry 2016.J. J. G. C. acknowledges the Spanish MINECO for a Juan de la Cierva fellowship (#JCI-2012-12517)