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Ultrathin and vertical NiCo2O4 nanosheets were grown on nitrogen-doped reduced graphene oxide (NiCo2O4 NSs@N-rGO) through a simple one-step co-precipitation procedure. The NiCo2O4 NSs@N-rGO nanocomposites were investigated through X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. And the performance of NiCo2O4NSs@N-rGO non-enzymatic glucose sensor was measured by cyclic voltammetry and amperometric method. The sensor exhibited two wide linear ranges of 0.01 mM-5.50 mM and 5.50 mM-15.50 mM with high sensitivity of 4372.9 μA·mM−1cm−2 and 1686.1 μA·mM−1cm−2, which is much better than other Co-based and Ni-based glucose sensors. In addition, the non-enzymatic glucose sensor also shows strong anti-interference and durability. Besides, it is found that this non-enzymatic glucose sensor can accurately measure the blood glucose concentration in human serum, which provides a great possibility for future application in medical treatment. [ABSTRACT FROM AUTHOR]

A non-enzymatic glucose-sensing material composed of α-nickel hydroxide nanosheets grown on reduced graphene oxide sheets (α-Ni(OH)2-rGO) is fabricated by a straightforward co-precipitation method. The morphology and composition of the α-Ni(OH)2-rGO are analyzed by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectroscopy, thermogravimetric analyzer, and X-ray photoelectron spectroscopy. The characterization results show that the content of Ni(OH)2 in the α-Ni(OH)2-rGO composites is about 82.77 wt%. The introduction of rGO can effectively prevent α-Ni(OH)2 from agglomeration. The thickness of the α-Ni(OH)2 sheets grown vertically on the rGO is less than 10 nm, and they are interwoven to form a porous network structure. Then, the α-Ni(OH)2-rGO/NiF (Nickel Foam)-sensing electrode is prepared with NiF as the substrate. The sensing mechanism and detection property of the α-Ni(OH)2-rGO/NiF-sensing electrode are researched through cyclic voltammetry (CV) and amperometry. The test results demonstrate that α-Ni(OH)2-rGO/NiF-sensing electrode has excellent glucose-sensing performance. Its linear detection range is as wide as 0.5–22.5 mM, and the sensitivity is as high as 95.5 μAmM−1 cm−2, which is obviously much better than previously studied glucose-sensing materials. Moreover, it is found that the prepared sensing electrode has excellent anti-interference and stability. After repeated measurements, the anodic peak current is only 6% lower than the initial current. More importantly, the sensing electrode also showed a good detection ability for actual samples, which fully confirms that α-Ni(OH)2-rGO/NiF-sensing electrode has good practical application potential. [ABSTRACT FROM AUTHOR]

A distinctive hierarchical hybrid nanostructure which consists of the ultrathin and vertical NiMn2O4 nanosheets grown on reduced graphene oxide (NiMn2O4 NSs@rGO) is synthesised as a non-enzyme glucose sensor by a simple co-precipitation and hydrothermal procedure. The structures and morphologies of the NiMn2O4 NSs@rGO nanocomposites are investigated through X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Cyclic voltammetry and amperometry measurement are applied to analyse the glucose sensing characteristics of NiMn2O4 NSs@rGO. The obtained NiMn2O4 NSs@rGO sensor exhibits two wide linear ranges of 0.001 mM-1 mM and 1 mM-3.5 mM with high sensitivity of 2615.2μAmM−1 cm−2 and 294.8μAmM−1 cm−2, which is much better than other Ni-based and Mn-based glucose sensors. In addition, the NiMn2O4 NSs@rGO nanocomposites have excellent anti-interference and stability. Moreover, the constructed sensor is viable in the analysis of real serum samples, which makes it become a medically dependable non-enzymatic glucose sensor with great possibility. [ABSTRACT FROM AUTHOR]