Elemental Cu doped Co3O4 thin film for highly sensitive non-enzymatic glucose detection

Abstract

We report on the non-enzymatic glucose sensing ability of elemental Cu doped Co3O4 thin film deposited on FTO in this study. A facile chemical solution method was used to substitute elemental Cu into the Co3O4 host lattice. The morphology of the electrode was characterized by XRD, SEM, HRTEM, SAED and EELS. The as prepared thin film exhibited very high sensitivity of 1850 μAcm-2 mM−1, and linear range up to 7.6 mM. The sensor showed a limit of detection of 153 nM at a signal to noise ratio of 3. The developed sensor was used successfully to measure glucose level in human serum and spiked saliva samples. Keywords: Co3O4, Non-enzymatic sensor, Glucose sensor, Thin film