Abstract
A sensitive glucose biosensor was developed based on the adsorption of glucose oxidase by a three-dimensional silver-graphene-titanium dioxide (3D Ag-GR-TiO2) composite electrode. Aerosol spray pyrolysis was employed to synthesize the 3D Ag-GR-TiO2 composite using a colloidal mixture of a silver acetate precursor (C2H3AgO2), graphene oxide, and TiO2 nanoparticles. The effects of the operating temperature, gas flowrate, and TiO2 concentration on the particle properties were investigated. The particle morphology of all 3D Ag-GR-TiO2 composites was spherical in shape. The average sizes of composites could be controlled from 0.45 to 0.64 μm with the variation of process variables. Ag nanoparticles less than 10 nm in diameter were deposited on the surfaces of the TiO2 nanoparticles and GR after a reduction process. The characteristics of the glucose biosensor fabricated with the as-prepared 3D Ag-GR-TiO2 composite were assessed through cyclic voltammetry measurements. The biosensor exhibited a high current flo...
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