Non-enzymatic glucose electrochemical sensor based on Fe-doped NiMoO4 as well as preparation method and application of non-enzymatic glucose electrochemical sensor
A glucose and electrochemical technology, which is applied in the field of electrochemical detection, can solve the problems of high cost, limited application, and suboptimality of the non-enzyme glucose sensor, and achieve excellent glucose oxidation performance, strong anti-interference ability, and simple and easy operation Effect
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Embodiment 1
[0044] Embodiment 1 prepares Ni 0.99 Fe 0.01 MoO 4 catalyst
[0045] Follow the steps below:
[0046] Add nickel nitrate hexahydrate, ferric nitrate nonahydrate, sodium molybdate dihydrate, and ultrapure water as a solvent into a 50mL beaker in sequence according to the molar ratio of 0.99:0.01:1:1.67, stir with a magnetic stirrer for 1h, and transfer the obtained product as a whole into Put it in an oven at 80°C for 12 hours to obtain dry precipitated powder, put the powder in a crucible at 450°C in a muffle furnace, heat up at a rate of 7.5°C / min, and calcinate for 2 hours to obtain a catalyst. Take 1 mg of the prepared catalyst powder and add it into 1 mL of ultrapure water, and sonicate for 30 min to obtain a uniformly dispersed catalyst solution.
Embodiment 2
[0047] Embodiment 2 prepares Ni with reference to embodiment 1 operation steps 0.97 Fe 0.03 MoO 4 Catalyst; Embodiment 3 prepares Ni with reference to embodiment 1 operating steps 0.95 Fe 0.05 MoO 4 Catalyst; Embodiment 4 prepares Ni with reference to embodiment 1 operating steps 0.9 Fe 0.1 MoO 4 Catalyst; Embodiment 5 prepares Ni with reference to embodiment 1 operating steps 0.8 Fe 0.2 MoO 4 Catalyst; Embodiment 6 prepares NiMoO with reference to embodiment 1 operating steps 4 catalyst.
[0048] In order to evaluate the response of the synthesized catalyst to glucose, a preliminary electrochemical detection of 10mM glucose was carried out with the prepared catalyst, and the detection results are shown in Table 1
[0049] Table 1 Fe-doped NiMoO with different concentrations 4 Responses of non-enzymatic glucose catalysts to glucose (n=3)
[0050]
[0051] As can be seen from Table 1, the prepared catalyst of the present invention has a higher current response t...
Embodiment 7
[0052] Example 7 Preparation of a non-enzymatic glucose electrochemical sensor for glucose detection
[0053] Follow the steps below:
[0054] 1) Wash the glassy carbon electrode with piranha washing solution (98% H 2 SO 4 / 30%H 2 o 2 =3:1, v / v) Rinse with ultrapure water after soaking for 30 minutes;
[0055] 2) Use the electrodes obtained in step 1) with 0.3 μm and 0.05 μm Al 2 o 3 The powder is polished to a mirror surface, and then the electrodes are ultrasonically treated in the order of ultrapure water, absolute ethanol, and ultrapure water, and dried for later use;
[0056] 3) Place the electrode obtained in step 2) in 0.5M H 2 SO 4 Electrochemical activation was carried out in the medium, then rinsed with ultrapure water, and dried;
[0057] 4) Add 10 μL of the catalyst solution prepared in Example 1, Example 2, Example 3, and Example 6 dropwise onto the surface of the glassy carbon electrode cleaned in step 3), and dry at room temperature to obtain a non-oxid...
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