Monodisperse core-shell microspheres of polystyrene (PSt) contained photo-iniferter moieties were prepared first by a two-stage dispersion polymerization in which -methacryloxylethyl 2-N

N-diethyldithiocarbamylacetate (MAEDCA) was charged into a reaction system after nucleation.Subsequently

raspberry-like PSt/poly acrylamide (PAM) particles were achieved by an ultraviolet light-induced surface grafting polymerization of acrylamide (AM) using the as-prepared photosensitive PSt particle as an initiator

and in a medium of methanol which is not a good solvent for the grafted chain of PAM.The morphology and core-shell structure of as-produced particles were revealed by scanning electron microscope (SEM) and transmission electron microscope (TEM) observation.Fourier transform infrared spectroscopy(FTIR)

ultraviolet and visible absorption spectroscopy(UV-Vis)

nuclear magnetic resonance (1H-NMR) and X-ray photoelectron spectroscopy (XPS) analyses demonstrated that the degree of incorporated photo-iniferter moieties on particle surface improved with the increase of MAEDCA added in system.In addition

it is advantageous to achieve narrowly distributed microspheres when a mixture of MAEDCA

styrene (St)

2

2'-azodiisobutyronitrile (AIBN)

methanol (MeOH) and H2O were introduced into the system in the second stage of dispersion polymerization.The surface of PSt particles grafted with PAM became hydrophilic

and on which Ag nano-particles were attached readily.