Preparation method of platinum/nano porous gold tin/carbon fiber paper composite electrode for simultaneously detecting ascorbic acid, dopamine and uric acid

A nanoporous gold and composite electrode technology, applied in the field of electrochemical detection, can solve the problems of high material and process costs, and the inability to realize industrial production, etc., achieve a large electrochemical active area, facilitate liquid mass transmission, and improve electrochemical detection. The effect of the response signal

Inactive Publication Date: 2019-09-17
HUIZHOU LEADAO ELECTRONICS MATERIAL
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Problems solved by technology

However, the cost of materials and processes used in this method is too high to realize industrial production.

Method used

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  • Preparation method of platinum/nano porous gold tin/carbon fiber paper composite electrode for simultaneously detecting ascorbic acid, dopamine and uric acid
  • Preparation method of platinum/nano porous gold tin/carbon fiber paper composite electrode for simultaneously detecting ascorbic acid, dopamine and uric acid
  • Preparation method of platinum/nano porous gold tin/carbon fiber paper composite electrode for simultaneously detecting ascorbic acid, dopamine and uric acid

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[0061] A method for preparing a platinum-modified nanoporous gold-tin / carbon fiber paper composite electrode (Pt@NP-AuSn@Ni@CFP) that can be used to simultaneously detect ascorbic acid, uric acid and dopamine, specifically comprising the following steps:

[0062] (1) Preparation of Ni / CFP composite electrode: place carbon fiber paper in concentrated nitric acid solution, treat it at 120 °C for 80 min, then soak it in 1M sodium hydroxide solution for 1 h, wash it with deionized water, and place Dry in an oven at 60°C for later use; bind the dried carbon fiber paper on a nickel sheet and conduct electrodeposition treatment using a double-electrode constant current mode to obtain a Ni / CFP composite electrode;

[0063] (2) Preparation of AuSn / Ni / CFP composite electrode: using the Ni / CFP composite electrode as a base material, electrodeposit gold-tin film and wash to obtain AuSn / Ni / CFP composite electrode;

[0064] (3) Preparation of NP-AuSn / Ni / CFP composite electrode: the AuSn / Ni / ...

Embodiment 1

[0076] Preparation of Pt@NP-AuSn@Ni@CFP composite electrode:

[0077] Put the carbon fiber paper in concentrated nitric acid solution, treat it at 120°C for 80 minutes, then soak it in 1M sodium hydroxide solution for 1 hour, wash it with deionized water, and dry it in an oven at 60°C for later use; The dried carbon fiber paper was bound on a nickel sheet and subjected to electrodeposition treatment using a two-electrode constant current mode to obtain a Ni / CFP composite electrode. The composition of the electrodeposition solution is: nickel sulfate hexahydrate 250g / L, nickel chloride hexahydrate 40g / L, boric acid 35g / L, sodium dodecylsulfonate 0.1g / L, saccharin 0.8g / L, 1,4- Butynediol 0.1g / L; electrodeposition temperature is 50°C, current density is 0.79A / dm 2 , the time is 17min.

[0078] AuSn / Ni / CFP composite electrodes were obtained by electrodepositing AuSn thin films and cleaning them with Ni / CFP composite electrodes as substrates. The gold-tin plating solution is com...

Embodiment 2

[0085] Quantitative testing of ascorbic acid, dopamine and uric acid at Pt@NP-AuSn@Ni@CFP composite electrode:

[0086] (1) Prepare the Pt@NP-AuSn@Ni@CFP composite electrode according to the steps in Example 1, place it in 0.1M PBS solution, add 5μM dopamine, 0.5mM uric acid and 100-2000μM ascorbic acid for differential pulse voltammetry test , get the test results as attached Figure 5 (a). According to the test results, it can be concluded that the linear detection range of ascorbic acid is 200-2000 μM, and its detection limit is 5.53 μM.

[0087] (2) Prepare the Pt@NP-AuSn@Ni@CFP composite electrode according to the steps of Example 1, place it in 0.1M PBS solution, add 1mM ascorbic acid, 0.5mM uric acid and 0.5-100μM dopamine for differential pulse voltammetry test , get the test results as attached Figure 5 (b). According to the test results, it can be concluded that the linear detection range of dopamine is 1-10 μM, and the detection limit is 0.31 μM.

[0088] (3) ...

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Abstract

The invention provides a preparation method of a platinum-modified nano porous gold tin / carbon fiber paper composite electrode (Pt@NP-AuSn@Ni@CFP) and an electrochemical detection application of ascorbic acid, uric acid and dopamine. The preparation method comprises the following steps that metal nickel of thin layer is pre-deposited on carbon fiber paper (CFP), and then gold tin alloy film is electrodeposited to obtain AuSn / Ni / CFP composite electrode, then the AuSn / Ni / CFP composite electrode is incompletely dealloyed to obtain a composite electrode NP-AuSn / Ni / CFP, and the composite electrode NP-AuSn / Ni / CFP is replaced to obtain a composite electrode Pt@NP-AuSn@Ni@CFP. According to the invention, the platinum nano material is modified on the nano porous gold tin, so that the electrochemical active area of the electrode is enlarged, and the composite electrode has higher sensitivity, wider detection range and excellent anti-interference performance, and is suitable for research and development of corresponding quick detection instruments.

Description

technical field [0001] The invention belongs to the field of electrochemical detection, and in particular relates to a preparation method of a platinum-modified nanoporous gold-tin / carbon fiber paper composite electrode (Pt@NP-AuSn@Ni@CFP), and its application in ascorbic acid (AA), uric acid (UA ) and dopamine (DA) electrochemical rapid detection applications. Background technique [0002] Ascorbic acid (AA), dopamine (DA) and uric acid (UA) are small organic molecules that exist in the extraneural fluid of the nerve center of higher animals and have important biological research value. Clinical studies have shown that many diseases are caused by these three small organic molecules. Therefore, in disease prevention, clinical diagnosis and scientific research, accurate and rapid detection of ascorbic acid, dopamine and uric acid is of great significance. [0003] Ascorbic acid, dopamine and uric acid are three small organic molecules with electrochemical activity. By applyi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
CPCG01N27/308
Inventor 奚亚男胡淑锦
Owner HUIZHOU LEADAO ELECTRONICS MATERIAL
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