▎ 摘　　要

We synthetized hybrid materials with multifunctional properties by coupling graphene nanoplatelets (GNP) modified with carboxylic groups to titanium dioxide (TiO2) nanoparticles (NPs) and tested them both as photocatalysts to promote pollution abatement and as tracers of the presence of a model antigen (bovine serum albumin, BSA) in immunochemical assays. The presence of carboxylic groups proved to be crucial in both applications: they improved TiO2 photocatalytic activity by the interaction between the carboxylic groups on the GNP surface and the hydroxyl groups on TiO2 surface, and allowed for covalently binding the material to BSA. The photoactivity of the materials was exploited for the oxidation of 3,3',5,5'-tetramethylbenzidine for immunochemical applications.