NiCo layered double hydroxide nanosheets grown on graphite sheet and its application for a non-enzymatic glucose sensor

The favorable electro-catalytic activity of nickel-cobalt layered double hydroxide (NiCo-LDH) in alkaline electrolytes due to the stability of Ni۲+/Ni۳+ and Co۲+/Co۳+ redox couples has led to its use as a promising biosensor for glucose determination. Herein, the NiCo-LDH nanosheets hasbeen successfully synthesized on graphite sheets (GSs) by hydrothermal method. NiCo-LDH nanosheets on GSs were fabricated with designed ratios of Ni:Co = ۳:۱ and controlledmorphology. The synthesized sample was investigated by SEM, XRD, FTIR and cyclic voltammetry (CV) analysis to gain vision about morphology, structure, electrochemical performance. The as-prepared NiCo/GS-LDH has good electro-catalytic performance for glucose oxidation, with the sensitivity of the two linear ranges (۰.۰۴–۰.۳ mmol L− ۱ and ۰.۳۵–۴ mmol L− ۱) with ۲۵۷۳ μA L mmol− ۱ and ۱۷۶.۱ μA L mmol− ۱, respectively. The detection limit (LOD) is almost ۴۳۵ μmol L− ۱ (S/N = ۳.۳). Furthermore, the synergistic effect of the bimetal NiCo-LDH provides more active sites for electrochemical reactions and shortens the ion transport path.Accordingly, the fabricated NiCo/GS-LDH has great potential application prospects in the fieldof and non-enzymatic glucose sensors.

کلیدواژه ها:

Layered double hydroxide (LDH) ، Graphite sheet ، Glucose ، Non-enzymatic ، Electrochemical sensor