Glucose biosensor based on platinum nanoparticles supported sulfonated-carbon nanotubes modified glassy carbon electrode

Highly dispersed Pt nanoparticles supported on sulfonated multiwalled carbon nanotubes (Pt/sulfonated-MWCNTs) were used to modify glassy carbon (GC) electrode and then glucose oxidase was immobilized on the Pt/sulfonated-MWCNTs/GC electrode to construct a GOD/Pt/sulfonated-MWCNTs/GC glucose biosensor. The electrochemical and detection performance were evaluated by cyclic voltammogram and chronoamperometry. The optimum detection conditions were determined and the stability was studied. The results show that the GOD/Pt/sulfonated-MWCNTs/GC glucose biosensor has much higher detection sensitivity of 0.56 μA/mM and much larger linear range up to 6.4 mM at rather lower working potential of 0.5 V. It can keep more than 85% of its initial activity after continuously using one hour. The results show that the resultant GOD/Pt/sulfonated-MWCNTs/GC glucose biosensor has high electrocatalytic activity and excellent detecting performance for glucose.