Marigold flower shaped nanopetteled Co0.7Zn0.3Fe1.7Ni0.3O4 microspheres as efficient glucose sensor

Abstract

The spinel-type porous Co0.7Zn0.3Fe1.7Ni0.3O4 mesoporous flower alike microspheres were fabricated using hydrothermal technique. Electron microscopic investigations reveal interconnected porous nano lamella which construct highly stable microspheres. XRD results demonstrate an increase in the values of lattice constants due to effective substitution of Zn and Fe. The electrochemical characterizations, cyclic voltammetry (CV), chronoamperometry techniques, and electrochemical impedance spectroscopy (EIS) are conducted in three electrode system. The EIS and CV results indicate frequency dependent conductivity of the compound obeyed the Jonscher's power law. A glucose concentration range from 0.1 mM/L to 11.1 mM/L is chosen to cover non-diabetic to diabetic person. The sensitivity response of the electrochemical sensor for glucose is 92% in contrast with urea (13%), folic acid (9.1%), ascorbic acid (9%), potassium chloride (1%) and NaCl (2.2%) interferers. Further, on the same electrode the repetitive responses display its reproducibility and excellent sensitivity towards glucose; point to its potential application as effective glucose sensor.