AAAR 34th Annual Conference
October 12 - October 16, 2015
Hyatt Regency
Minneapolis, Minnesota, USA
Abstract View
Aerosol Synthesis of 3D Silver-Graphene-Titanium Oxide Composite
HEE DONG JANG, Sun Kyung Kim, Hankwon Chang, Eun Hee Jo, Korea Institute of Geoscience and Mineral Resources
Abstract Number: 36 Working Group: Nanoparticles and Materials Synthesis
Abstract A sensitive glucose biosensor was developed based on the adsorption of glucose oxidase by a three-dimensional (3D) silver (Ag) graphene (GR)-titanium dioxide (TiO2) composite electrode. Aerosol spray pyrolysis (ASP) was employed to synthesize the 3D Ag-GR-TiO2 composite using a colloidal mixture of a silver acetate precursor (C2H3AgO2), graphene oxide (GO), and TiO2 nanoparticles. The effect of the operating temperature on the particle properties, including the morphology and crystal structure, was investigated. The particle morphology of all 3D Ag-GR-TiO2 composites was spherical in shape, with an average size of about 500 nm. Ag nanoparticles less than 10 nm in diameter were deposited on the surfaces of the TiO2 nanoparticles and GR after a reduction process. A higher intensity of the crystallinity of Ag was measured at a higher operating temperature. 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 flow as well as clear redox peaks, resulting in a superior ability of the catalyst in terms of the electrochemical reactions. The highest sensitivity obtained from the amperometric response of the glucose biosensor was 12.2 µA/mM•cm2.