Synthesis of graphene based noble metal composites for glucose biosensor

Graphene (GR) based noble metal composites such as Pt-GR and Au-GR were synthesized for sensitive glucose biosensors. Aerosol spray pyrolysis (ASP) was employed to synthesize the noble metal nanoparticles-GR composites using a colloidal mixture of GO and noble metal precursor (H2PtCl6·6H2O and AuCl4·3H2O). The morphology of noble metal-GR composites was generally the shape of a crumpled paper ball, and the average composite size was about 1 µm. Crystalline Pt and Au nanoparticles less than 5 nm in diameter were uniformly deposited on the crumpled GR sheets, respectively. The charateristics of the as-prepared biosensors were tested through cyclic voltammetry measurements. All the biosensors based on the noble metal-crumpled GR composite exhibited a higher current flow as well as clear redox peaks, which resulted in a superior ability of the catalyst in terms of an electrochemical reaction. The amperometric response of the glucose biosensor based on the Pt-crumpled GR composite indicated the highest sensitivity as 62 µA/mM cm2.