An electrochemical sensor of single-walled carbon nanohorns@hydroxylated multi-walled carbon nanotubes and its application in the detection of nitenpyram
A single-walled carbon nanohorn and multi-walled carbon nanotube technology, which can be applied to electrochemical variables of materials, scientific instruments, instruments, etc., can solve the problems of high detection limit and low sensitivity, and achieve the effect of improving sensitivity and easy automation of detection.
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Embodiment 1
[0033] A single-walled carbon nanohorn@hydroxylated multi-walled carbon nanotube electrochemical sensor, the preparation of the electrochemical sensor includes the following steps:
[0034] (1) Treatment of glassy carbon electrodes:
[0035] A glassy carbon electrode with a diameter of 3 mm was first polished with γ-alumina with a particle size of 0.05 μm, then ultrasonically cleaned with double distilled water, and dried at room temperature to obtain a glassy carbon electrode pretreatment;
[0036] (2) Pretreatment of single-wall carbon nanohorn@hydroxylated multi-wall carbon nanotube modified electrode:
[0037] Take the single-wall carbon nanohorn dispersion liquid and apply it dropwise on the surface of the glassy carbon electrode pretreatment, and place it under an infrared lamp to irradiate to dry to obtain a single-wall carbon nanohorn modified electrode; then take the hydroxylated multi-wall carbon nanotube dispersion liquid Drop-coating on the surface of the single-w...
Embodiment 2
[0045] A single-walled carbon nanohorn@hydroxylated multi-walled carbon nanotube electrochemical sensor, the preparation of the electrochemical sensor includes the following steps:
[0046] (1) Treatment of glassy carbon electrodes:
[0047] A glassy carbon electrode with a diameter of 3 mm was first polished with γ-alumina with a particle size of 0.05 μm, then ultrasonically cleaned with double distilled water, and dried at room temperature to obtain a glassy carbon electrode pretreatment;
[0048] (2) Pretreatment of single-wall carbon nanohorn@hydroxylated multi-wall carbon nanotube modified electrode:
[0049] Take the single-wall carbon nanohorn dispersion liquid and apply it dropwise on the surface of the glassy carbon electrode pretreatment, and place it under an infrared lamp to irradiate to dry to obtain a single-wall carbon nanohorn modified electrode; then take the hydroxylated multi-wall carbon nanotube dispersion liquid Drop-coating on the surface of the single-w...
Embodiment 3
[0057] Method for detecting nitenpyram by electrochemical sensor:
[0058]The electrochemical sensor is placed in the electrolytic cell loaded with electrolyte, and the concentration of nitenpyram in the analyte is detected by differential pulse voltammetry;
[0059] Wherein, the electrolyte is a PBS buffer solution with a concentration of 0.2mol / L; the volume of the electrolytic cell is 25mL, and the volume of the loaded electrolyte is 20mL during each detection, which is stirred by an electromagnetic stirrer; the pH of the liquid in the electrolytic cell is 7.0.
[0060] The electrolyte was passed through high-purity nitrogen for 3 minutes before use to fully remove the dissolved oxygen in it.
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