Novel Sn Doped Co3O4 Thin Film for Nonenzymatic Glucose Bio-Sensor and Fuel Cell

A facile chemical solution deposition via two-step spin coating technique was used to fabricate nanoparticulate novel Sn doped Co3O4 thin film for glucose sensor and fuel cell applications. Substitution of Sn into Co3O4 host lattice lead to a remarkable increase in the electrocatalytic activity of the Co3O4 electrode material. Film thickness played a significant role in enhancing the charge transferability of the electrode as was observed from electrochemical impedance spectroscopy (EIS). The best sensor exhibited two wide linear response ranges (2 mu M up to similar to 0.5 mM and 0.6 mM up to similar to 5.5 mM respectively) with sensitivities of 921 and 265 mu A cm(-2) mM(-1) respectively and low limit of detection of 100 nM (S/N=3). The sensor was very selective towards glucose in the presence of various interference and showed long term stability. Moreover, the developed thin film modified electrode could generate one electron current in nonenzymatic fuel cell setup at room temperature.