Synthesis of CuO/g-C3N4 composites, and their application to voltammetric sensing of glucose and dopamine
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The preparation of 3 kinds of carbonaceous nanocomposites by hydrothermal treatment and subsequent calcination described. The first comprises a nanomaterial of type CuO/g-C3N4, with g-C3N4 in mass fractions of 2, 5 and 7 wt%, respectively. The second comprises CuO/porous carbon (5 wt%), and the third comprises CuO/carbon spheres (5 wt%). All of them were employed to modify a glassy carbon electrode (GCE) to obtain electrochemical sensors for glucose and dopamine. The GCE modified with CuO/g-C3N4 (5 wt%) displays the highest electrocatalytic activity towards glucose and dopamine. Figures of merit for sensing glucose (in 0.1 M NaOH solution) include a wide linear range (0.5 μM to 8.5 mM), a detection limit of 0.150 μM, and a sensitivity of 0.274 μA·μM−1·cm−2 (at a working potential of 0.60 V vs. Ag/AgCl). The respective data for dopamine (in pH 7.0 solution) are linear ranges from 0.2-16.0 μM and 16.0-78.7 μM, a lower detection limit of 60 nM, and an electrochemical sensitivity of 0.834 and 0.331 μA·μM−1·cm−2 (at a working potential of 0.22 V vs. Ag/AgCl). The good performance of the modified GCE is attributed to the synergetic interactions between CuO and the appropriate fraction of g-C3N4, and the improvement of conductivity.
KeywordsCarbonaceous material Nanocomposite Hydrothermal method Calcination Synergetic effect Electrocatalyst Electrochemical sensor Cyclic voltammetry Amperometric response Differential pulse voltammetry
We acknowledge financial support from the National Natural Science Foundation of China (Grant No. 21205030), and by key project of Hubei provincial education department (D20171001), and Hubei Key Laboratory of Ferro & Piezoelectric Materials and Devices (201710), and (111 project, B12015).
Compliance with ethical standards
The author(s) declare that they have no competing interests.
Conflict of interest
The authors declare that they have no conflict of interest.
- 6.Krishnamoorthy K, Sudha V, Kumar SMS, Thangamuthu R (2018) Simultaneous determination of dopamine and uric acid using copper oxide nano-rice modified electrode. J Alloys Compd. https://doi.org/10.1016/j.jallcom.2018.03.118
- 21.Fang L, Xie Y, Wang Y et al (2019) Facile synthesis of hierarchical porous carbon nanorods for supercapacitors application. Appl Surf Sci 46:4479–4487Google Scholar
- 24.Xu S, Zhu H, Cao W, Wen Z, Wang J et al (2018) Cu-Al2O3-g-C3N4 and cu-Al2O3-C-dots with dual-reaction centres for simultaneous enhancement of Fenton-like catalytic activity and selective H2O2 conversion to hydroxyl radicals. Appl Catal B-Environ 234:223-233Google Scholar
- 28.Chen J, Liu C, Huang Y, Lee H, Feng S (2018) Study of the growth mechanisms of nanoporous ag flowers for non-enzymatic glucose detection. Microchem J. https://doi.org/10.1088/1361-6528/aae363
- 29.Li Y, He X, Guo M, Lin D et al (2018) Porous NiTe2 nanosheet array: An effective electrochemical sensor for glucose detection. Sensors Actuat B:Chem. https://doi.org/10.1016/j.snb.2018.07.17
- 31.Luan F, Zhang S, Chen D et al (2018) Ni3S2/ionic liquid-functionalized graphene as an enhanced material for the nonenzymatic detection of glucose. Microchem J. https://doi.org/10.1016/j.microc.2018.08.046
- 35.Khan MZH, Liu X, Tang Y, Zhu J, Hu W (2018) A glassy carbon electrode modified with a composite consisting of gold nanoparticle, reduced graphene oxide and poly(L-arginine) for simultaneous voltammetric determination of dopamine, serotonin and L-tryptophan. Microchim Acta 185:439CrossRefGoogle Scholar