Preparation method of fullerene loaded flower-shaped platinum catalyst
A platinum catalyst, fullerene technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of low sensitivity and poor stability, and achieve high sensitivity High, good stability, improve the effect of active area
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Embodiment 1
[0033] (1) Preparation of fullerene nanoparticles. Under ultrasonic conditions, slowly drop 3ml of 1.4mg / ml C60 toluene solution into a round-bottomed flask containing 15mL of acetonitrile, and continue to sonicate for 10min after the addition is complete; centrifuge the precipitate, wash it with absolute ethanol three times, and vacuum 40 ℃ and dried for 24 hours to obtain fullerene nanoparticles with a diameter of about 50-300nm. The scanning electron microscope picture of fullerene nanoparticles is as follows: figure 1 shown.
[0034] (2) Preparation of fullerene modified electrodes. Weigh 1 mg of fullerene nanoparticles and ultrasonically disperse them uniformly in 0.5 ml of absolute ethanol to obtain a C60 ethanol dispersion with a concentration of 2 mg / ml; pipette 75 μL of C60 ethanol dispersion into a circular electrolytic cell filled with distilled water (25 ×25mm), the available density is 30.5μg / cm 2 C60 film. Use the active surface of a clean glassy carbon elec...
Embodiment 2
[0037] Quantitative determination of glucose by electrochemical sensor.
[0038] The glassy carbon electrode prepared in Example 1 attached to the fullerene-loaded platinum catalyst was placed in 0.5mol / l H 2 SO 4 Among them, at a sweep rate of 0.05V / s, use cyclic voltammetry to sweep from -0.2 to 1.0V until the curve is stable, then rinse with twice distilled water, and dry to obtain an electrochemical sensor. With the saturated calomel electrode as the reference electrode, the platinum wire as the auxiliary electrode, and the phosphate buffer solution (pH=7.4) as the measurement medium, the chronoamperometry method was used to carry out gradient sampling of the glucose standard solution at a measurement voltage of 0.4V. Record time-current curves such as Figure 4 shown. It can be seen that with the increase of glucose concentration, the response current intensity also increases, and the magnitude of the increase is proportional to the concentration gradient of glucose in...
Embodiment 3
[0040] Stability of electrochemical sensors and electrochemical determination of glucose concentration in serum samples.
[0041] The electrochemical sensor prepared by the fullerene-loaded flower cluster platinum catalyst in embodiment 2 is directly exposed to the air for one month, and the response current intensity of the glucose standard solution of 10mol / l is tested every 5 days, before each use First in 0.5mol / l H 2 SO 4 In the process, cyclic voltammetry was used to sweep from -0.2 to 1.0V at a sweep rate of 0.05V / s until it stabilized and then used again. Such as Figure 6As shown, the current intensity only decays by about 20% after continuous use for one month, which shows that the electrochemical sensor has good stability and reusability.
[0042] The electrochemical determination of the glucose concentration in the serum sample is as follows: the serum sample is centrifuged at 10,000 rpm for five minutes, the supernatant is drawn, filtered with a 0.23 μm filter ...
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