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.
Graphical abstract
\(\hbox {MnFe}_{{2}}\hbox {O}_{4}\) 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.
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Acknowledgements
RR acknowledges the (No. 21(1006)/15/EMR-II) Council of Scientific and Industrial Research-Emeritus Scientist Scheme for financial support. TRM is the recipient of DST-INSPIRE Senior Research Fellowship (No. IF150326).
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Madhura, T.R., Kumar, G.G. & Ramaraj, R. Gold nanoparticles decorated silicate sol-gel matrix embedded reduced graphene oxide and manganese ferrite nanocomposite-materials-modified electrode for glucose sensor application. J Chem Sci 131, 35 (2019). https://doi.org/10.1007/s12039-019-1611-z
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DOI: https://doi.org/10.1007/s12039-019-1611-z