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In situ two-step preparation of 3D NiCo-BTC MOFs on a glassy carbon electrode and a graphitic screen printed electrode as nonenzymatic glucose-sensing platforms

Ezzati, M ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1021/acssuschemeng.0c03806
  3. Publisher: American Chemical Society , 2020
  4. Abstract:
  5. In the present study, a rational two-step strategy is employed for the green, fast, very simple, and highly controllable synthesis of the bimetallic nickel-cobalt-based metal-organic frameworks (MOFs) on glassy carbon substrates by in situ transformation of nickel-cobalt-layered double hydroxide nanosheet (NiCo-LDHs NSs) intermediates into nickel-cobalt-benzene tricarboxylic acid MOFs (E-NiCo-BTC MOFs). The structural characteristics of the electrode materials in each step were investigated via Fourier transform infrared spectroscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, elemental mapping, field emission scanning electron microscopy, and transmittance electron microscopy. In addition, the electrocatalytic behavior of the E-NiCo-BTC/GCE as a nonenzymatic sensing platform toward glucose electro-oxidation was evaluated via cyclic voltammetry, amperometry, and electrochemical impedance spectroscopy techniques. The as-prepared sensing platform shows two linear dynamic ranges of 0.001-1.78 mM with a sensitivity of 1789 μA mM-1 cm-2 and 1.78-5.03 mM with a sensitivity of 1436 μA mM-1 cm-2 together with acceptable selectivity against interfering species, high poisoning resistance against chloride ions, and high repeatability and reproducibility of glucose electro-oxidation responses. The value of the detection limit based on a signal to noise ratio of 3 (S/N = 3) was calculated to be 0.187 μM. Moreover, the electrochemical responses of E-NiCo-BTC/GCE were compared to those of modified electrodes via hydrothermal-based NiCo-BTC MOFs and corresponding monometallic based modified electrodes obtained via an in situ method. Finally, in order to investigate the commercialization capability and to develop the proposed sensor from lab-to-market, the same in situ two-step strategy with some variations was used to modify the graphitic screen-printed electrode. This sensing platform showed acceptable responses toward glucose electro-oxidation with a low fouling effect of the modifier film over a wide range of glucose concentrations (0.0-5.7 mM) and an ignorable real sample matrix effect on the sensor performance as well as good sensitivity (230.5 μA mM-1 cm-2) and selectivity, which verify the ability of the proposed method for designing accurate and credible low-cost and on-site sensing platforms for practical applications. Copyright © 2020 American Chemical Society
  6. Keywords:
  7. Amperometric detection ; In situ two step synthesis ; NiCo-BTC MOFs ; Nonenzymatic glucose sensor ; Screen-printed electrode ; Self-sacrificial intermediates ; Carbon ; Chlorine compounds ; Cobalt compounds ; Cobalt deposits ; Cyclic voltammetry ; Electrochemical impedance spectroscopy ; Electrooxidation ; Energy dispersive spectroscopy ; Field emission microscopes ; Fourier transform infrared spectroscopy ; Glass ; Glass membrane electrodes ; Glucose ; Metal-Organic Frameworks ; Nickel compounds ; Organic polymers ; Organometallics ; Oxidation ; Scanning electron microscopy ; Electrocatalytic behavior ; Electrochemical impedance spectroscopy techniques ; Energy dispersive X ray spectroscopy ; Field emission scanning electron microscopy ; Layered double hydroxide nanosheets ; Metalorganic frameworks (MOFs) ; Structural characteristics ; Transmittance electron microscopy ; Signal to noise ratio
  8. Source: ACS Sustainable Chemistry and Engineering ; Volume 8, Issue 38 , 2020 , Pages 14340-14352
  9. URL: https://pubs.acs.org/doi/10.1021/acssuschemeng.0c03806