Cu-MOFs loaded nitrogen-doped graphene composite material and preparation method and application thereof
A technology of nitrogen-doped graphene and composite materials, which is applied in the field of material preparation and electrochemical analysis, can solve the problems of high detection limit and low sensitivity, and achieve the effect of low detection limit, high sensitivity and strong anti-interference
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Embodiment 1
[0043] Preparation of Nitrogen-doped Graphene Composite Materials Supported by Example 1 Cu-MOFs
[0044] (1) First, 2.0mmol copper nitrate trihydrate was added to the mixed solvent (composed of 0.5mL acetic acid, 0.2mL triethylamine and 20.0mL absolute ethanol) and stirred at room temperature for 0.5h to dissolve, then 1.2mmol trimellines was added Continue to stir formic acid for 1 hour to form a uniform dispersion; add the dispersion to a polytetrafluoroethylene reactor, react in an oven at 80°C for 20 hours, take out the product and wash it with absolute ethanol for 5 to 6 times after centrifugal separation. After centrifugation again, it was dried in an oven at 60°C for 10 hours, and finally blue Cu-MOFs powder was obtained;
[0045] (2) Weigh 9.0 mg of nitrogen-doped graphene and disperse it in 10.0 mL of N,N-dimethylformamide solvent, and oscillate ultrasonically for 1 hour until the dispersion is uniform to obtain a nitrogen-doped graphene dispersion;
[0046] (3) Tak...
Embodiment 2
[0063] Example 2 Preparation of a Cu-MOFs loaded nitrogen-doped graphene composite modified electrode
[0064] (1) Take a glassy carbon electrode with a diameter of 3 mm, firstly grind it on the aluminum powder with a particle size of 0.3 μm for 3 minutes, then grind it on the aluminum powder with a particle size of 0.05 μm for 10 minutes, and then use dilute nitric acid, ethanol and water respectively Ultrasonic washing and drying to obtain a pretreated glassy carbon electrode;
[0065] (2) 1 mg of the nitrogen-doped graphene composite material supported by Cu-MOFs described in Example 1 is ultrasonically dispersed in 2 mL of N, N-dimethylformamide solvent to obtain an electrode modification solution;
[0066] (3) 6.0 μL of electrode modification solution was added dropwise on the surface of the pretreated glassy carbon electrode, and after drying, the Cu-MOFs-supported nitrogen-doped graphene composite modified electrode was obtained.
[0067] At the same time, with referen...
Embodiment 3
[0068] Example 3 Detection performance of a Cu-MOFs-loaded nitrogen-doped graphene composite modified electrode
[0069] In this example, the Cu-MOFs-loaded nitrogen-doped graphene composite modified electrode prepared in Example 2 was used as the experimental object, and it was combined with a platinum auxiliary electrode and a saturated calomel reference electrode to form a three-electrode system, connected to a CHI660 electrode Chemical workstation (Shanghai Chenhua Instrument Co., Ltd.) for electrochemical performance testing.
[0070] (1) Comparison of electrocatalytic performance of rutin with different electrodes
[0071] In order to more intuitively reflect the electrocatalytic performance of the Cu-MOFs-loaded nitrogen-doped graphene composite modified electrode on rutin, the Cu-MOFs-loaded nitrogen-doped graphene composite modified electrode was first Cyclic voltammograms were measured in B-R buffer (a) containing 1.0mmol / L rutin and blank B-R buffer (b). like fi...
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