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Gold-nanoparticle-contained mesoporous composite film electrode and preparation method and application thereof.

A composite film and nanoparticle technology, which is applied in the electrochemical field of ascorbic acid detection, can solve the problems of long preparation time, complicated process, easy to fall off, etc., and achieves the effects of simple pretreatment, simple method and good stability.

Inactive Publication Date: 2019-09-03
多助科技(武汉)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this patent, the dispersion of graphene oxide-multi-walled carbon nanotubes is extremely difficult and takes a long time. The surface pretreatment process of glassy carbon electrodes is also complicated, and the chemical growth method is used to prepare gold nanorods, which takes a long time to prepare. Complicated, and finally coating graphene oxide-multi-walled carbon nanotubes and gold nanorod solutions on the surface of glassy carbon also has the problem of easy peeling off

Method used

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  • Gold-nanoparticle-contained mesoporous composite film electrode and preparation method and application thereof.
  • Gold-nanoparticle-contained mesoporous composite film electrode and preparation method and application thereof.
  • Gold-nanoparticle-contained mesoporous composite film electrode and preparation method and application thereof.

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specific Embodiment approach

[0036]The specific embodiment of the present invention is as follows: the preparation method of the gold-containing nanoparticle mesoporous composite film electrode comprises the following steps:

[0037] (1) Ultrasonic wash the ITO conductive glass electrode in acetone, ethanol, and deionized water for 5 to 30 minutes, and blow dry them sequentially with a nitrogen gun, and set aside.

[0038] (2) A three-electrode system is adopted, the working electrode is an ITO conductive glass electrode, the reference electrode is a silver-silver chloride electrode, and the counter electrode is a platinum sheet. The mixed solution contains 20mL 0.1M sodium nitrate solution (solvent is deionized water), 1.28mmol cetyltrimethylammonium bromide, 4mmol tetraethylorthosilicate, 400μL 0.1M hydrochloric acid solution, 20mL ethanol.

[0039] (3) Apply a voltage of -1.3V vs.Ag|AgCl by the constant voltage method, deposit for 10-30 seconds, and a dense mesoporous silicon dioxide film can be obtain...

Embodiment 1

[0048] A preparation method of a gold-containing nanoparticle mesoporous composite thin film electrode of the present embodiment is as follows:

[0049] (1) At room temperature, use acetone, ethanol, and deionized water to sonicate the ITO conductive glass for 15 minutes each, dry the moisture on the surface with a nitrogen gun, and put the conductive side up into a petri dish for use.

[0050] (2) Prepare 20mL 0.1M sodium nitrate solution (solvent is deionized water), 1.28mmol cetyltrimethylammonium bromide, 400μL 0.1M hydrochloric acid solution, 20mL ethanol mixed solution, after magnetic stirring for 0.5h, Add 4 mmol tetraethyl orthosilicate and continue stirring for 2.5 h to obtain the electrolyte required for preparing the mesoporous film. ITO conductive glass was used as the working electrode, silver / silver chloride was used as the reference electrode, and platinum sheet was used as the counter electrode. Among them, the ITO conductive glass is placed flat on the bottom...

Embodiment 2

[0059] Compared with Example 1, the concentration of chloroauric acid in the electrolyte in step (4) of the preparation method was changed to 3mM, and other steps were the same as in Example 1.

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Abstract

The invention provides a gold-nanoparticle-contained mesoporous composite film electrode and a preparation method and application thereof. The preparation method comprises: preparing an electrolyte ofa mesoporous film to be a mixed solution of sodium nitrate, cetyl trimethyl ammonium bromide, deionized water, ethyl alcohol, hydrochloric acid, and tetraethyl orthosilicate by using a conductive substrate as a working electrode, a silver / silver chloride electrode as a reference electrode, and a platinum sheet as an auxiliary electrode; under a certain deposition voltage and deposition time, forming a dense mesoporous silicon dioxide film on the surface of the conductive substrate; carrying out washing by using deionized water, carrying out drying, and carrying out calcining to obtain a mesoporous silicon dioxide film / conductive substrate electrode; carrying out deposition under a certain voltage for a period of time by using the mesoporous silicon dioxide film / conductive substrate electrode as the working electrode and not changing other electrodes so as to obtain a gold-nanoparticle-contained mesoporous composite film electrode. According to the invention, the electrical signal toan AA oxidation reaction by a conductive substrate is detected by using the electrochemical method to realize the effect of catalyzing AA oxidation. The gold-nanoparticle-contained mesoporous composite film electrode has advantages of low cost and high stability.

Description

technical field [0001] The invention belongs to the field of electrochemical technology for detecting ascorbic acid, and in particular relates to a mesoporous composite film electrode containing gold nanoparticles, a preparation method and application. Background technique [0002] Ascorbic acid (AA), that is, vitamin C, participates in various biological reactions in the organism and is one of the indispensable important nutrients in the human body. Since the human body can only take in ascorbic acid from external food, the lack of this substance will cause scurvy, so the determination of its content has great significance in medicine and practical application. However, there are many substances in the human body that have similar oxidation potentials to ascorbic acid, which are easily interfered during the determination process. Especially on glassy carbon electrodes, ITO conductive glass and other electrodes, AA has a higher oxidation potential, so how to reduce the oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/327G01N27/48
CPCG01N27/3277G01N27/48
Inventor 韦晨慧楠刘启明杨希国
Owner 多助科技(武汉)有限公司