Neutron reflectivity on polymer multilayers doped with magneticnanoparticles

摘要

The aim of this work is to elaborate nanocomposite thin films sensitive to a magnetic field byincorporating magnetic nanoparticles in a symmetrical diblock copolymer matrix organized inlamellae on plane substrates. On the one hand, the symmetrical diblock copolymer P(n-BMA)-b-PSis synthesized by ATRP and characterized by several methods. On the other hand, nanoparticlesmade of maghemite y-Fe2O3 are functionalized with PS using the "grafting from" technique in orderto make them compatible with polystyrene and to insert them in PS lamellae. Composite films areelaborated by "spin coating" a solution containing both the y-Fe203@PS core-shell nanoparticlesand the copolymer onto a silicon substrate. After annealing, these films are characterized mainly byAFM and neutron reflectivity to investigate the lamellar order.