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A preparation method of hydrotalcite carbon paper composite material and its application as a biosensor

A composite material and hydrotalcite technology, which is applied in the field of electrochemical biosensor preparation, can solve the problems of intermediate level of electrocatalytic performance of composite electrodes, and achieve the effects of good electrocatalytic performance, high sensitivity, and increased specific surface area.

Active Publication Date: 2016-05-25
BEIJING NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The composite electrode base material is cheap and the preparation process is relatively simple, but the electrocatalytic performance of the composite electrode can only reach a moderate level.

Method used

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  • A preparation method of hydrotalcite carbon paper composite material and its application as a biosensor
  • A preparation method of hydrotalcite carbon paper composite material and its application as a biosensor
  • A preparation method of hydrotalcite carbon paper composite material and its application as a biosensor

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Effect test

Embodiment 1

[0031] A. Preparation of AlOOH colloidal solution: Dissolve aluminum isopropoxide in deionized water at a mass ratio of aluminum isopropoxide to deionized water of 1 / 10, stir at 85°C for 20 minutes; use 1mol / L HNO 3 The pH of the aqueous solution was adjusted to 3.4, stirred at 85°C for 2 hours, and then dried at 60°C to obtain solid AlOOH, which was ground into powder; dissolved according to the mass ratio of AlOOH to deionized water of 1 / 18, stirred at 85°C for 60 Minutes, then add 1mol / L HNO dropwise 3 aqueous solution, adjust the pH to 2.5 to obtain a milky white translucent AlOOH colloidal solution;

[0032] B. Preparation of reaction bottom liquid: according to Ni(NO 3 ) 2 ·6H 2 O and NH 4 NO 3 Ni(NO 3 ) 2 ·6H 2 O and NH 4 NO 3 Soluble in deionized water, NH 4 NO 3 The concentration is 2mol / L; finally adjust the pH to 5.9 with 1mol / L ammonia water to obtain the reaction bottom solution;

[0033] C. Preparation of hydrotalcite carbon paper composite material: 1...

Embodiment 2

[0041] The preparation of A.AlOOH colloidal solution is with embodiment 1;

[0042] B. Preparation of reaction bottom liquid: according to Co(NO 3 ) 2 ·6H 2 O and NH 4 NO 3 Co(NO 3 ) 2 ·6H 2 O and NH 4 NO 3 Soluble in deionized water, NH 4 NO 3 The concentration is 2mol / L; finally adjust the pH to 6.0 with 1mol / L ammonia water to obtain the reaction bottom liquid;

[0043] C. Preparation of hydrotalcite carbon paper composite material: 1) immerse the carbon paper in ethanol, acetone, and secondary water for 20 minutes, and then dry it naturally at room temperature; 2) then immerse the carbon paper in the AlOOH colloidal solution , take it out after 10 minutes, dry it with N2, and complete the deposition of one layer of AlOOH; 3) repeat step 2) to operate 20 times, and deposit AlOOH thin layers of different thicknesses on the surface of carbon paper; 4) deposit the carbon of AlOOH thin layer on the surface The paper is immersed in the reaction bottom solution, seale...

Embodiment 3

[0047] A. Preparation of AlOOH colloidal solution: Dissolve aluminum isopropoxide in deionized water at a mass ratio of aluminum isopropoxide to deionized water of 1 / 9, stir at 80°C for 30 minutes; use 1mol / L HNO 3 The pH of the aqueous solution was adjusted to 3.7, stirred at 80°C for 3 hours, and then dried at 50°C to obtain solid AlOOH, which was ground into powder; dissolved according to the mass ratio of AlOOH to deionized water of 1 / 17, stirred at 85°C for 100 Minutes, then add 1mol / L HNO dropwise 3 aqueous solution, adjust the pH to 2 to obtain a milky white translucent AlOOH colloidal solution;

[0048] B. Preparation of reaction bottom liquid: according to Ni(NO 3 ) 2 ·6H 2 O and NH 4 NO 3 Ni(NO 3 ) 2 ·6H 2 O and NH 4 NO 3 Soluble in deionized water, NH 4 NO 3 The concentration is 2.3mol / L; finally adjust the pH to 5.9 with 1mol / L ammonia water to obtain the reaction bottom liquid;

[0049] C. Preparation of hydrotalcite carbon paper composite material: 1...

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Abstract

The invention discloses a hydrotalcite-carbon paper composite material prepared by employing an in-situ growth method, and the composite material is applied to prepare a biosensor. The hydrotalcite-carbon paper composite material employs carbon paper as a substrate material, an AlOOH thin layer is firstly deposited on the carbon paper surface, and then the in-situ growth method is employed, so that porous hydrotalcite thin membrane is grown on the carbon paper surface. The porous hydrotalcite thin membrane helps to greatly increase the specific area and provide a large amount of active sites, and an excellent conductive network is formed through mutual intersection of excellent-electroconductivity carbon fiber in the base carbon paper. The composite material used as the biosensor has extremely high electro-catalytic sensitivity, good operation stability and storage stability. The composite material exhibits extremely high sensitivity and a relatively wide linear scope when applied to perform enzyme-free catalysis on glucose in a base solution. Additionally, because of self physical performances, the composite material can be arbitrarily clipped according to a reaction container while keeping good electro-catalysis performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrochemical biosensors, and in particular relates to the preparation of a hydrotalcite carbon paper composite material by an in-situ growth method and its application in the preparation of biosensors. Background technique [0002] The characteristics of high speed, high efficiency, sensitivity, and portability make the research and development of electrochemical sensors a major research hotspot in the field of electrochemistry. The core component of the biosensor is the biomolecular recognition element, which is the working electrode in the common three-electrode system. The first condition of the working electrode is to have high conductivity, corrosion resistance, etc., so a large number of scientific researchers choose Use ready-made glassy carbon electrodes or noble metal electrodes, etc., and focus on the modification of electrodes. However, for a long time, this type of electroch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/327
Inventor 海波邹应全杨遇春晏凯
Owner BEIJING NORMAL UNIVERSITY
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