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Electrode, preparation method thereof, and electrochemical biosensor

A biosensor and electrochemical technology, applied in the field of electrochemical biosensors, can solve the problems of unsatisfactory electrocatalytic performance of electrode structure, easy to be polluted, unstable electrode structure, etc., achieve excellent electrocatalytic performance, simple process, and avoid pollution Effect

Active Publication Date: 2016-05-18
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The electrode structure prepared by this method has unsatisfactory electrocatalytic performance, and the electrode structure is relatively unstable and easily polluted.

Method used

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  • Electrode, preparation method thereof, and electrochemical biosensor
  • Electrode, preparation method thereof, and electrochemical biosensor
  • Electrode, preparation method thereof, and electrochemical biosensor

Examples

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preparation example Construction

[0027] This embodiment provides a method for preparing an electrode, which includes the following steps:

[0028] 1) The cleaned pure titanium sheet (200μm, 99.99%) is used as the working electrode, and the Pt wire is used as the counter electrode. Anodized in the fluoride-water-glycol solution as the electrolyte, the applied voltage is DC20-60V, anodizing time is 1-4h. In the fluoride-water-ethylene glycol solution, the concentration of fluoride is 0.05-1 wt.%, and the concentration of water is 0.5-10 vol.%.

[0029] Through the above control, the purpose of anodizing the surface of the titanium sheet is achieved, and in conjunction with the subsequent step 2), a regular titanium dioxide array tube can be produced. Specifically, the above-mentioned fluoride is one or a mixture of ammonium fluoride, hydrogen fluoride, lithium fluoride and sodium fluoride.

[0030] 2) Put the anodized titanium sheet in step 1) into ethylene glycol for cleaning and soaking for 10-48 hours to remove e...

Embodiment 1

[0041] The cleaned pure titanium sheet (200μm, 99.99%) is used as the working electrode, and the Pt wire is used as the counter electrode. The electrolyte is ammonium fluoride (0.3wt.%)-water (2vol.%)-ethylene glycol solution. Anodic oxidation. The applied voltage is DC30V, and the anodizing time is 2h. After the above-mentioned anodized titanium sheet was cleaned and soaked in ethylene glycol for 24 hours to remove excess fluoride ions, the pole piece was heated in a muffle furnace at 450°C for 2 hours, and the heating rate was in the range of 1°C / min. Use the above-treated titanium sheet as the working electrode, Ag|AgCl (saturated KCl) as the reference electrode, and Pt wire as the counter electrode. The graphene oxide (0.5mg / mL), chloroauric acid (0.5mM) and high Electrochemical co-deposition is carried out in a three-electrode system with a mixed solution of lithium chlorate (16mM) as the electrolyte. The applied voltage was -1.2V, and the deposition time was 30s. After...

Embodiment 2

[0043] The difference between this embodiment and Embodiment 1 is that the electrochemical co-deposition time in the three-electrode system is controlled at 60 seconds. The prepared Au / r-GO / TNTs electrode was named 60-AG / TNTs.

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Abstract

The invention discloses an electrode, a preparation method thereof and an electrochemical biosensor. The preparation method of the electrode includes the following steps of firstly, conducting anodic oxidation treatment with a pure titanium plate as a working electrode, a Pt wire as a counter electrode and fluoride-water-ethanediol dissolution liquid as electrolyte; secondly, conducting thermal treatment after the titanium plate subjected to anodic oxidation treatment in the first step is washed so that the microstructure of titanium dioxide array pipes can be formed on the surface of the titanium plate; thirdly, arranging a reference electrode and the counter electrode with the titanium plate processed in the second step as a working electrode, and conducting electrochemical co-deposition in a three-electrode system, wherein the electrolyte of the three-electrode system is a mixed solution composed of a graphene oxide solution with the concentration of 0.1-1 mg / L and a precious metal ion solution with the concentration of 0.1-1 mmol / L; fourthly, washing the titanium plate obtained in the third step, and drying the titanium plate at a room temperature to obtain the electrode. The electro-catalytic property of the prepared electrode is good in performance, and the electro-catalytic property of the electrochemical biosensor composed of the electrode is also good.

Description

【Technical Field】 [0001] The invention relates to an electrode, a preparation method thereof, and an electrochemical biosensor. 【Background technique】 [0002] In recent years, electrochemical biosensors have been widely demanded in the fields of biomedicine, environmental monitoring, food and medicine industry due to their various advantages such as high selectivity, high sensitivity, fast analysis, and convenient operation. At present, most of the electrochemical biosensors widely used commercially are electrochemical enzyme sensors, and enzymes are generally added to the electrode substrate. Although the enzyme sensor has the advantages of high sensitivity, good selectivity, and low detection limit, it is difficult to prepare and purify the enzyme, and the enzyme activity is easily affected by environmental factors such as pH, temperature, and the method of immobilizing the enzyme. , Resulting in unsatisfactory cost, stability, service life and reproducibility of enzyme senso...

Claims

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Application Information

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IPC IPC(8): G01N27/26G01N27/30C02F1/30C02F1/46C02F101/34
CPCC02F1/30C02F1/46109C02F2001/46142C02F2101/345G01N27/26G01N27/30
Inventor 司知蠢黄山翁端
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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