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      Synthesis of Ni-Co Hydroxide Nanosheets Constructed Hollow Cubes for Electrochemical Glucose Determination

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          Abstract

          Hierarchical Ni-Co double transition metal hydroxide nanosheets have been explored as an effective strategy for the design of nonenzymatic glucose sensors. Ni-Co hydroxide nanosheets constructed hollow cubes were successfully synthesized by using Cu 2O cubes as templates and subsequently etched by Na 2S 2O 3 to achieve a hollow cubic structure. The molar ratio between Ni and Co was tuned by varying the precursor ratio of NiCl 2 and CoCl 2. It was observed by transmission electron microscopy (TEM) that the increasing Ni precursor resulted in particle morphology, and the increasing ratio of the Co precursor resulted in more lamellar morphology. The sample with the composition of Ni 0.7Co 0.3(OH) 2 displayed the best performance for glucose sensing with high selectivity (1541 μA mM –1 cm –2), low detection limit (3.42 µM with S/N = 3), and reasonable selectivity. Similar strategies could be applied for the design of other electrode materials with high efficiency for nonenzymatic glucose determination.

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          Electrode systems for continuous monitoring in cardiovascular surgery.

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            Electrochemical non-enzymatic glucose sensors.

            The electrochemical determination of glucose concentration without using enzyme is one of the dreams that many researchers have been trying to make come true. As new materials have been reported and more knowledge on detailed mechanism of glucose oxidation has been unveiled, the non-enzymatic glucose sensor keeps coming closer to practical applications. Recent reports strongly imply that this progress will be accelerated in 'nanoera'. This article reviews the history of unraveling the mechanism of direct electrochemical oxidation of glucose and making attempts to develop successful electrochemical glucose sensors. The electrochemical oxidation of glucose molecules involves complex processes of adsorption, electron transfer, and subsequent chemical rearrangement, which are combined with the surface reactions on the metal surfaces. The information about the direct oxidation of glucose on solid-state surfaces as well as new electrode materials will lead us to possible breakthroughs in designing the enzymeless glucose sensing devices that realize innovative and powerful detection. An example of those is to introduce nanoporous platinum as an electrode, on which glucose is oxidized electrochemically with remarkable sensitivity and selectivity. Better model of such glucose sensors is sought by summarizing and revisiting the previous reports on the electrochemistry of glucose itself and new electrode materials.
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              Glucose oxidase: an ideal enzyme

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                Author and article information

                Journal
                Sensors (Basel)
                Sensors (Basel)
                sensors
                Sensors (Basel, Switzerland)
                MDPI
                1424-8220
                03 July 2019
                July 2019
                : 19
                : 13
                : 2938
                Affiliations
                [1 ]School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China
                [2 ]School of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China
                [3 ]College of Science, China University of Petroleum (East China), Qingdao 266580, China
                Author notes
                [* ]Correspondence: yanzhou@ 123456upc.edu.cn
                Article
                sensors-19-02938
                10.3390/s19132938
                6651393
                31277330
                b685e567-37fa-4092-bc1a-07c6e9bfca8d
                © 2019 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 30 May 2019
                : 01 July 2019
                Categories
                Article

                Biomedical engineering
                nonenzymatic,glucose sensor,electrochemical sensor,double hydroxides
                Biomedical engineering
                nonenzymatic, glucose sensor, electrochemical sensor, double hydroxides

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