Fabrication and characterization of graphite oxide – nanoparticle composite based field effect transistors for non-enzymatic glucose sensor applications

Graphite-oxide based field-effect transistors (FETs) were fabricated and used as glucose sensors. Herein, graphite-oxide was assembled between two electrical electrodes. The sensitivity of the sensor has been enhanced by adding copper (Cu) and silver (Ag) nanoparticles. The nanoparticles were produced by sputtering and inert-gas condensation inside an ultra-high compatible system, and self-assembled on the graphite-oxide. The sensitivity of the sensor was increased by an order of magnitude when the silver nanoparticles were added, while the low concentration could be detected more sensitively by adding copper nanoparticles. The sensitivity of each FET was studied at different concentrations of non-enzymatic glucose for potential use in medical and industrial applications.