Ex Situ Synthesis of Hexagonal NiO Nanosheets and Carboxyl-Terminated Reduced Graphene Oxide Nanocomposite for Non-Enzymatic Electrochemical Detection of H2O2 and Ascorbic Acid
In this study, we successfully developed a novel nanocomposite comprising hexagonal nickel oxide nanosheets (HNONS) and carboxyl-terminated reduced graphene oxide (Tr-rGO) using a hydrothermal process followed by calcinations for the detection of H2O2 and ascorbic acid. The surface morphology and structure of HNONS@Tr-rGO were characterized using field-emission scanning electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. The electro catalytic activities of HNONS@Tr-rGO toward H2O2 and ascorbic acid were investigated using cyclic voltammetry, amperometry, and electrochemical impedance spectroscopy. Under optimized conditions, the HNONS@Tr-rGO modified electrode exhibited a high sensitivity of 177.83 μAmM−1cm−2, wide linear range from 0.25 μM to 13.1 mM, and low detection limit of 0.25 μM (S/N = 3) as a non-enzymatic ascorbic acid sensor. Whereas, for H2O2, the sensor showed a high sensitivity of 222.16 μAmM−1cm−2, wide linear range from 0.3 μM to 10.7 mM, and low detection limit of 0.3 μM (S/N = 3). The feasibility of the developed highly sensitive, selective, and reproducible H2O2 and ascorbic acid sensors was investigated in human serum. The experimental observations demonstrated that the HNONS@Tr-rGO nanocomposite is highly promising for the development of electrochemical sensors to detect biomolecules.
Similar Publications:
In this research, an electrochemical PSA (prostate specific antigen) immunosensor based on Nafion/reduced graphene oxide (rGO)/a...
In this context, a novel, scalable and facile method for the green synthesis of graphene oxide (GO) to facilitate effective and ...
In this study, an environmentally friendly and simple method to synthesize rGO–BiNP nanocomposite was newly developed to a...
A novel nanocomposite of hexagonal cobalt oxide nanosheets (HCONS) homogeneously dispersed on a carbon matrix of reduced graphen...
The conventional synthetic methods for graphene oxide are based on the reaction of graphite with ...
A solvothermal technique with extra treatment was performed to synthesize high quality chemically modified graphene (CG). An environmentally friendly reducin...
An ultra-sensitive electrochemical immunosensor was successfully developed to accurately detect prostate specific antigen. To improve the performance of immu...
In this paper, the fabrication and characterization of chemically modified reduced graphene oxide (CRGO) embedded with platinum and palladium nanoparticles (...