Electrodeposition of ZnCo2O4 nanoparticles for biosensing applications

Abstract

We report the growth of ZnCo₂O₄ nanoparticles on indium tin oxide (ITO) coated glass substrates by a simple and highly reproducible electrodeposition method. The as-deposited ZnCo₂O₄ nanoparticles are characterized by various structural and microscopical tools for assessing their crystalline and morphological features. Electrochemical sensing properties of the as-prepared ZnCo₂O₄ nanoparticles towards glucose and dopamine are studied. ZnCo₂O₄ nanoparticles show linear response with respect to change in glucose concentration varying from 10 to 290 μM and possess an LOD value of 36.9 μM and a sensitivity of 0.92 μA μM⁻¹ cm⁻². In a similar way, ZnCo₂O₄ exhibits a linear response with respect to change in dopamine concentration varying from 5–100 μM with an LOD value of 15.4 μM and a sensitivity of 0.55 μA μM⁻¹ cm⁻² respectively.