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Nitrogen-doped graphene-thionine-gold nano composite material and electrochemical sensor thereof, preparation method of nitrogen-doped graphene-thionine-gold nano composite material, and preparation method and application of electrochemical sensor

A technology of nitrogen-doped graphene and composite materials, applied in the direction of material electrochemical variables, scientific instruments, analytical materials, etc., can solve the problems of expensive, single signal of electrochemical sensors, affecting detection accuracy and stability, etc.

Active Publication Date: 2020-02-28
ANHUI NORMAL UNIV
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Problems solved by technology

[0004] With the development of analytical techniques, various methods have been developed for the determination of DES and H 2 o 2 , such as high-performance liquid chromatography, gas chromatography-mass spectrometry, liquid chromatography-mass spectrometry, and capillary electrophoresis; although these methods can provide the desired detection results, they are relatively time-consuming, expensive, and cumbersome
At present, there are also some detection methods of DES and H through electrochemical sensors in the existing technology. 2 o 2 , but the traditional electrochemical sensor has only a single signal, which is easily disturbed by internal or external environmental factors, affecting the accuracy and stability of detection

Method used

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  • Nitrogen-doped graphene-thionine-gold nano composite material and electrochemical sensor thereof, preparation method of nitrogen-doped graphene-thionine-gold nano composite material, and preparation method and application of electrochemical sensor
  • Nitrogen-doped graphene-thionine-gold nano composite material and electrochemical sensor thereof, preparation method of nitrogen-doped graphene-thionine-gold nano composite material, and preparation method and application of electrochemical sensor
  • Nitrogen-doped graphene-thionine-gold nano composite material and electrochemical sensor thereof, preparation method of nitrogen-doped graphene-thionine-gold nano composite material, and preparation method and application of electrochemical sensor

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preparation example Construction

[0021] The invention provides a method for preparing a nitrogen-doped graphene-thionine-gold nanocomposite material, comprising: ultrasonically conducting nitrogen-doped graphene NG, thionine Thi, a gold source, and a reducing agent under light-proof conditions reaction to prepare nitrogen-doped graphene-thionine-gold nanocomposites NG-Thi-AuNPs.

[0022] In the above preparation method, the consumption of each material can be selected in a wide range, but in order to further improve the accuracy, stability and sensitivity of the detection results of the electrochemical sensor made; preferably, NG, Thi, gold source, The dosage ratio of reducing agent is 2mg: 2×10 -3 -3×10 -3 mmol: 0.025-0.075mmol: 0.05-0.15mol, the molar weight of the gold source is calculated by the molar weight of gold atoms contained.

[0023] In the above preparation method, the condition of ultrasonic reaction can be selected in a wide range, but in order to further improve the accuracy, stability and s...

preparation example 1

[0039] Preparation of NG-Thi-AuNPs nanocomposites:

[0040] First disperse nitrogen-doped graphene NG (the content of nitrogen element is 3wt%) in water and ultrasonic 30min to obtain NG solution; take 2mL 1mg / mL NG solution, add 5mL 0.5mmol / L Thi aqueous solution to it, then add 2mL0.025mol / L of HAuCl 4 4H 2 O aqueous solution, then add 1 mL of 0.1 mol / L ascorbic acid AA solution, and sonicate for 2 hours in the dark (the power of the ultrasonic reactor is 40KHz). The reaction system was centrifuged at 9000 rpm for 15 min, the precipitate was washed with distilled water, and dried at 60°C to obtain the NG-Thi-AuNPs complex.

preparation example 2

[0042] According to the method of Preparation Example 1, the difference is that the amount of Thi aqueous solution is 6mL, HAuCl 4 4H 2 The consumption of O aqueous solution is 3 mL, and the consumption of ascorbic acid AA solution is 1.5 mL.

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Abstract

The invention discloses a nitrogen-doped graphene-thionine-gold nano composite material and an electrochemical sensor thereof, a preparation method of a nitrogen-doped graphene-thionine-gold nano composite material, and a preparation method and application of an electrochemical sensor. The preparation method of the nitrogen-doped graphene-thionine-gold nano composite material comprises the following step of: carrying out ultrasonic reaction on nitrogen-doped graphene (NG), thionine (Thi), a gold source and a reducing agent under a dark condition to prepare the nitrogen-doped graphene-thionine-gold nano composite material (NG-Thi-AuNPs). The electrochemical sensor based on the doped graphene-thionine-gold nano composite material has excellent accuracy, stability and sensitivity on DES and H2O2 detection, and the preparation methods of the composite material and the electrochemical sensor have the advantages of the simple operation and the low cost.

Description

technical field [0001] The invention relates to an electrochemical sensor, in particular to a nitrogen-doped graphene-thionine-gold nanocomposite material, an electrochemical sensor and a preparation method and application thereof. Background technique [0002] Diethylstilbestrol (DES) is now considered an endocrine disruptor reference compound on the U.S. Protective Agency list; this designation stems from the slightly increased risk of cancer in the general population exposed to DES, specifically breast, prostate and cervical cancers Clear cell adenocarcinoma. Therefore, worldwide attention is being paid to monitoring the role of DES in food and the environment. [0003] Hydrogen peroxide (H 2 o 2 ) is a very common compound in production and life, and also plays a vital role in various practical fields, such as cosmetics, food, diagnostics, pharmaceuticals, clinical and environmental protection industries, etc. due to H 2 o 2 Not completely safe, excessive H 2 o 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/308G01N27/307G01N27/48
Inventor 阚显文庞莎莎
Owner ANHUI NORMAL UNIV
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