Enzyme-free electrochemical hydrogen peroxide sensor based on AgNFs-Pt nano-composite material, and preparation
A nano-composite material, hydrogen peroxide technology, applied in the direction of material electrochemical variables, nanotechnology for materials and surface science, scientific instruments, etc., to achieve the effect of regular shape, enhanced catalysis, and beautiful petals
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Embodiment 1
[0041]Embodiment 1, the preparation of silver micron flower (AgNFs)
[0042] Get 50mL sample bottle, BSA solution (5mg mL -1 ,10mL) with AgNO 3 The solution (10mM, 10mL) was stirred and mixed evenly at room temperature, then heated to 55°C in a water bath, and kept for a period of time, the AA solution (100mg mL -1 , 500 μL) into the mixed solution quickly, and after half an hour of magnetic stirring, the AgNFs solution can be obtained. Take out the completed solution and transfer it to a 50mL centrifuge tube at a centrifugation speed of (5000rpm, 10min), and wash back and forth three times. The final sample solution was freeze-dried, and the obtained AgNFs solid was stored in a 4°C refrigerator for future use.
Embodiment 2
[0043] Embodiment 2, preparation of silver micron flowers (AgNFs-Pt) with pollen particles
[0044] Redissolve the AgNFs solid in 20 mL of water, add H to the AgNFs solution at room temperature 2 PtCl 6 solution (38.6mM, 0.1mL), the rotor stirred fully and reacted for half an hour, then transferred the obtained solution to a 50mL centrifuge tube at a centrifuge speed of (5000rpm, 10min), and washed once to obtain the AgNFs-Pt solution. The final sample solution was freeze-dried, and the obtained AgNFs-Pt solid was stored in a 4°C refrigerator for future use.
Embodiment 3
[0045] Example 3, Construction of AgNFs-Pt enzyme-free electrochemical hydrogen peroxide sensor
[0046] The electrode selected in the experiment is a glassy carbon electrode with a diameter of 3 mm. The modification steps are as follows: the surface of the electrode is polished to a mirror-like smoothness with 0.3 and 0.05 μm aluminum powder, and then, in it mode, HAuCl 4 The solution plated its surface with gold, and a layer of golden yellow gold nanometer layer can be observed on the electrode surface. After rinsing with water and drying with nitrogen gas, AgNFs-Pt solution (3mg mL -1 , 6 μL). The modified electrode was incubated at room temperature for 4 hours, and after the droplet on the surface of the electrode was completely dry, the excess composite material that was not connected by the Au-S bond was washed away with water. In this way, the AgNFs-Pt enzyme-free electrochemical hydrogen peroxide sensor was constructed, and the electrode was stored in a 4°C refrigera...
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