Electrochemical sensor and preparation method and application thereof

A sensor and electrochemical technology, applied in the field of electrochemical sensor and its preparation, can solve the problems of cumbersome operation steps, long analysis time, low sensitivity, etc., and achieve the effect of simple process, high sensitivity and convenient operation

Active Publication Date: 2019-01-11
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0004] Aiming at the problems of the existing technology in the fields of food safety testing, environmental testing, pesticide residue testing and medical testing, the content analysis steps of related chemical substances are cumbersome, the analysis time is long, the sensitivity is low, and the cost is high. The present invention provides an electronic Chemical sensor and its preparation method and application

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  • Electrochemical sensor and preparation method and application thereof
  • Electrochemical sensor and preparation method and application thereof
  • Electrochemical sensor and preparation method and application thereof

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preparation example Construction

[0032] In one embodiment, the preparation method comprises the following steps:

[0033] (1) pre-processing the electrode to obtain the treated electrode;

[0034] (2) applying the multi-walled carbon nanotube dispersion droplets to the treated electrode surface, and after the electrode surface is dried, the multi-walled carbon nanotube-modified electrode is obtained;

[0035] (3) drop-coating the polyoxometalate solution on the surface of the carbon nanotube-modified electrode, and after the electrode is dried, a multi-wall carbon nanotube-polyoxometalate modified electrode is obtained;

[0036] (4) Gold nanoparticles are electrodeposited on the surface of the multi-walled carbon nanotube-polyoxometalate modified electrode to obtain a working electrode modified by the multi-walled carbon nanotube-polyoxometalate-gold nanoparticle composite material.

[0037] The above preparation method is further explained below:

[0038] Preferably, the electrode is a glassy carbon electr...

Embodiment 1

[0045] The electrochemical sensor of this embodiment includes an electrode and a multi-walled carbon nanotube-polyoxometalate-gold nanoparticle composite material coated on the surface of the electrode; the multi-walled carbon nanotube is acidified; the multi-metal Oxygenate is K 2 H 4 SiW 11 CuO 39 ·6H 2 O; the mass ratio of the multi-walled carbon nanotubes to the polyoxometalate is 1:15. The composite material is prepared by stacking multi-walled carbon nanotube layers, polyoxometalate layers and gold nanoparticle layers in sequence, and the number of cycles is one time.

[0046] The preparation method of the electrochemical sensor of the present embodiment comprises the following steps:

[0047] (1) Pre-treat the glassy carbon electrode with φ=3mm. For the first time, use aluminum oxide powder with a particle size of 1.0 μm for grinding treatment for 2 minutes, then ultrasonically clean it in deionized water for 3 minutes, and then wash it in absolute ethanol. Ultras...

Embodiment 2

[0052] The electrochemical sensor of this embodiment includes an electrode and a multi-walled carbon nanotube-polyoxometalate-gold nanoparticle composite material coated on the surface of the electrode; the multi-walled carbon nanotube is acidified; the multi-metal Oxygenate is K 2 H 4 SiW 11 CuO 39 ·6H 2 O; the mass ratio of the multi-walled carbon nanotubes to the polyoxometalate is 1:45.8. The composite material is prepared by stacking multi-walled carbon nanotube layers, polyoxometalate layers and gold nanoparticle layers in sequence, and the number of cycles is one time.

[0053] The preparation method of electrochemical sensor comprises the steps:

[0054] (1) Pre-treat the glassy carbon electrode with φ=3mm. For the first time, use aluminum oxide powder with a particle size of 1.0 μm for grinding treatment for 2 minutes, then ultrasonically clean it in deionized water for 3 minutes, and then wash it in absolute ethanol. Ultrasonic cleaning in medium for 2 minutes,...

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Abstract

The invention relates to the technical field of functional materials and sensors, in particular to an electrochemical sensor and a preparation method and an application thereof. The electrochemical sensor comprises an electrode and a multiwalled carbon nanotube-polyoxometallate-gold nanoparticle composite material coated to the surface of the electrode. The multiwalled carbon nanotube is acidified. The polyoxometallate is tungsten copper heteropolic undecasilicate. The electrochemical sensor has the characteristics of being wide in linear range, high in sensitivity and stability and good in repeatability, can qualitatively and quantitively detect acetaminophen accurately and conveniently, and is convenient to detect and relatively short in consumed time.

Description

technical field [0001] The present invention relates to the technical field of functional materials and sensors, in particular to an electrochemical sensor and a preparation method and application thereof. Background technique [0002] With the improvement of living standards, people are increasingly concerned about food safety and food pollution, environmental pollution, medical safety and other issues. Therefore, it is of great practical significance to study methods that can detect related chemical substances (such as acetaminophen, nitrite, etc.) sensitively, rapidly and simply. [0003] At present, in the fields of food safety testing, environmental testing, pesticide residue testing and pharmaceutical testing, titration, chromatography, spectrophotometry and chromatography are mostly used to determine the content of related substances. The above method or operation steps are cumbersome, or the analysis time is long, or the instrument is too fine and expensive, which i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48B82Y30/00
CPCB82Y30/00G01N27/308G01N27/48
Inventor 李娜张聪董鹏飞任聚杰赵海燕崔敏
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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