Gold nanoparticles decorated silicate sol-gel matrix embedded reduced graphene oxide and manganese ferrite nanocomposite-materials-modified electrode for glucose sensor application

Abstract

Gold nanoparticles decorated on silicate sol-gel matrix embedded manganese ferrite ( $$\hbox {MnFe}_{{2}}\hbox {O}_{4})$$ -reduced graphene oxide (rGO) nanocomposites were synthesized through a facile chemical method. The prepared samples were characterized by using powder X-ray diffraction (XRD), UV–vis absorption spectroscopy (UV-VIS), energy-dispersive X-ray spectroscopy (EDX), high-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) analyses. The Au nanostructures on rGO- $$\hbox {MnFe}_{{2}}\hbox {O}_{4}$$ improved the electrocatalytic activity of the rGO- $$\hbox {MnFe}_{{2}}\hbox {O}_{{4}}$$ @Au composite-materials-modified electrodes towards glucose oxidation. Cyclic voltammetry and amperometric methods were used to evaluate the electrocatalytic activity of the rGO- $$\hbox {MnFe}_{{2}}\hbox {O}_{{4}}$$ @Au modified electrodes towards glucose oxidation in 0.1 M NaOH at a less-positive potential (0.2 V) in the absence of any enzyme or redox mediator. The nanocomposite-modified electrode (GCE/EDAS/rGO- $$\hbox {MnFe}_{{2}}\hbox {O}_{{4}}$$ @Au) was successfully used for the amperometric sensing of glucose and the experimental detection limit of 10 $$\upmu \hbox {M}$$ glucose was observed. The common interfering agents did not interfere with the detection of glucose. The present sensor showed good stability, reproducibility, and selectivity. The nanocomposite-modified electrode was successfully used for the determination of glucose in the urine sample. $$\hbox {MnFe}_{{2}}\hbox {O}_{4}$$ based nanocomposite materials were prepared and used for enhanced electrochemical sensing of glucose. The gold nanoparticles decorated reduced graphene oxide- $$\hbox {MnFe}_{{2}}\hbox {O}_{4}$$ embedded in the functionalized silicate matrix. (EDAS/rGO- $$\hbox {MnFe}_{{2}}\hbox {O}_{{4}}$$ @Au) nanocomposite-material-modified electrode was used for the electrochemical sensing of glucose. The nanocomposite-material-modified electrode showed the enhanced catalytic activity for glucose oxidation and the detection limit was estimated as 2 $$\upmu \hbox {M}$$ and also the modified electrode showed good stability, and selectivity in the presence of interferents.