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Application of nitrogen-doped graphene-thionine-gold nanoelectrochemical sensor

A nitrogen-doped graphene, sensor technology, applied in the direction of material electrochemical variables, scientific instruments, instruments, etc., can solve problems such as expensive, time-consuming, affecting detection accuracy and stability, and achieve good conductivity and improve accuracy. effect of stability and sensitivity

Active Publication Date: 2022-08-02
ANHUI NORMAL UNIV
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  • Abstract
  • Description
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  • Application Information

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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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  • Application of nitrogen-doped graphene-thionine-gold nanoelectrochemical sensor
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  • Application of nitrogen-doped graphene-thionine-gold nanoelectrochemical 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: ultrasonicating nitrogen-doped graphene NG, thionine Thi, gold source and reducing agent under the condition of avoiding light reaction to prepare nitrogen-doped graphene-thionine-gold nanocomposite NG-Thi-AuNPs.

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

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

preparation example 1

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

[0040] First, the nitrogen-doped graphene NG (the content of nitrogen element is 3wt%) was dispersed in water and sonicated for 30min to obtain NG solution; 2mL of 1mg / mL NG solution was taken, 5mL of 0.5mmol / L Thi aqueous solution was added to it, and then added 2mL0.025mol / L HAuCl 4 ∙4H 2 O aqueous solution, then add 1 mL of 0.1 mol / L ascorbic acid AA solution, and sonicate for 2 h in the dark (the power of the ultrasonic reactor is 40 KHz). 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] Carry out according to the method of preparation example 1, the difference is, the amount of Thi aqueous solution is 6mL, HAuCl 4 ∙4H 2 The amount of O aqueous solution was 3 mL, and the amount of ascorbic acid AA solution was 1.5 mL.

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Abstract

The invention discloses a nitrogen-doped graphene-thionine-gold nanocomposite material, an electrochemical sensor and a preparation method and application thereof. The preparation method of the nitrogen-doped graphene-thionine-gold nanocomposite material comprises: The nitrogen-doped graphene NG, thionine Thi, gold source, and reducing agent were subjected to ultrasonic reaction under the condition of avoiding light to prepare nitrogen-doped graphene-thionine-gold nanocomposite NG-Thi-AuNPs. Electrochemical sensor based on this doped graphene-thionine-gold nanocomposite for DES and H 2 O 2 The detection has excellent accuracy, stability and sensitivity, and both the composite material and the electrochemical sensor preparation method have the advantages of simple operation and 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. Protected Agency List; this regulation stems from a slightly increased risk of cancer in the general population exposed to DES, particularly breast, prostate, and cervical cancer Clear cell adenocarcinoma. Therefore, worldwide attention is focused on 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 fields of practice, such as cosmetics, food, diagnostics, pharmaceuticals, clinical and environmental protection industries. due to H 2 O 2 Not completely safe, overdose H 2 O 2 Consumptio...

Claims

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Application Information

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Patent Type & Authority Patents(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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