Surface functionalized CoFe2O4 nano-hollowspheres: Novel properties

Abstract Stimuli-responsive controlled release of drugs from metal complex devices has been receiving great attention, as it provides many advantages such as better delivery efficiency and selective binding. Here in, we report the synthesis of biocompatible CoFe2O4 NHSs of diameter around 200 nm and emergence of intrinsic multiple fluorescence from blue, green to red on modifying their surface with hydrophilic bio-molecule such as folic acid. The surface engineered NHSs also show excellent drug loading and releasing efficiency in different conditions. Both the surface modified and bare hollow spheres showed excellent catalytic activity towards 4-nitrophenol reduction.