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 mm. 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 mA/mM cm. & 2013 Elsevier B.V. All rights reserved.