Co3O4 nanocrystal, preparation method thereof, use thereof and non-enzymatic hydrogen peroxide sensor thereof

A hydrogen peroxide and nanocrystal technology, applied in the field of nanostructures, can solve problems such as application limitation and complex fixation process, and achieve the effect of high sensitivity and high yield

Inactive Publication Date: 2012-07-18
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the immobilization process of biomolecules such as enzymes / proteins is very complicated, and due to the inherent characteristics of enzymes, their activities are easily affected by factors such as temperature, humidity, and pH, making the application of these hydrogen peroxide biosensors limited. Therefore, it is of great practical significance to develop a stable, easy-to-operate and high-efficiency enzyme-free hydrogen peroxide sensor

Method used

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  • Co3O4 nanocrystal, preparation method thereof, use thereof and non-enzymatic hydrogen peroxide sensor thereof
  • Co3O4 nanocrystal, preparation method thereof, use thereof and non-enzymatic hydrogen peroxide sensor thereof
  • Co3O4 nanocrystal, preparation method thereof, use thereof and non-enzymatic hydrogen peroxide sensor thereof

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Experimental program
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Effect test

Embodiment 1

[0028] 0.05g of 8-hydroxyquinoline, 0.1g of CO(NH 2 ) 2 and 20mL 0.025M Co(NO 3 ) 2 The solution was mixed and then transferred to a 50 mL Teflon-lined stainless steel reaction vessel. The sealed autoclave was kept at 200°C for 24 hours. Then the reactor was taken out, cooled to room temperature naturally, and the obtained precipitate was filtered, washed several times with absolute ethanol and distilled water, and then dried in the air. The obtained Co-8-hydroxyquinoline complex is a flower branch structure, which is formed by the arrangement of nanorods diverging from the center to the outside. The nanorods have a diameter of 10-50 nanometers and a length of 500 nanometers-5 micrometers.

Embodiment 2

[0030] The dendritic complex obtained in the above-mentioned Example 1 was calcined at 450° C. in air for 1 hour to obtain a black tricobalt tetraoxide nanostructure. The obtained tricobalt tetroxide has a flower branch structure, which is formed by the arrangement of nanorods diverging from the center to the outside. The nanorods have a diameter of 10-50 nanometers and a length of 500 nanometers-5 micrometers.

Embodiment 3

[0032] The flower dendritic Co that above-mentioned embodiment 2 obtains 3 o 4 Mix 0.1 mg of nanocrystals with 10 μl of solvent (perfluorosulfonate solvent / deionized water = 1:3) and disperse well after ultrasonication, then modify the surface of the glassy carbon electrode and dry in air for 1 h. And connect it to the electrochemical workstation as the working electrode, the other two electrodes are the platinum electrode and the silver / silver chloride reference electrode, and put it into different concentrations of H 2 o 2 In the phosphate buffer solution, (concentrations are 0.5; 1.0; 1.3; 1.7mM), obtain the linear scanning cyclic voltammetry curve, detect the peak current at -0.77V, with the increase of hydrogen peroxide concentration, the peak current gradually Elevated, indicating dendritic Co 3 o 4 The nanocrystal-modified glassy carbon electrode has good sensitivity to changes in hydrogen peroxide concentration. The working electrode in this embodiment can be repl...

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Abstract

The invention which discloses a Co3O4 nanocrystal, a preparation method thereof, a use thereof and a non-enzymatic hydrogen peroxide sensor thereof relates to a nanostructure. The Co3O4 nanocrystal has a flower spray-shaped crystal morphology. The preparation method comprises the following steps: mixing an aqueous Co<2+> solution with 8-hydroxyquinoline and urea, reacting under a hydrothermal condition to obtain a solid deposit which is a Co and 8-hydroxyquinoline complex, and roasting the complex as a precursor at a high temperature to obtain the Co3O4 nanocrystal. An inert electrode is modified by the Co3O4 nanocrystal to prepare the hydrogen peroxide sensor which is used for measuring the concentration of hydrogen peroxide in a solution. The method provided in the invention, which is simple and mild and treats the complex as the predecessor, allows the flower spray-shaped Co3O4 nanocrystal with the advantages of high yield and high quality to be obtained.

Description

technical field [0001] The present invention relates to a nanostructure, in particular to a Co 3 o 4 Nanostructure, its preparation method, application and hydrogen peroxide sensor. Background technique [0002] Hydrogen peroxide (H 2 o 2 ) is a very important intermediate compound in the environment and biological systems, and has been widely used in pollution control, textile and paper bleaching, food production, fungicides and other fields. However, it is also known to be a chemical agent that is hazardous to the environment and contributes to the development of various diseases. Therefore, the accurate determination of the concentration of hydrogen peroxide is very important for environmental, pharmaceutical, clinical and industrial research. Electrochemical method is to detect H 2 o 2 The most convenient method, however, due to the slow kinetic process and the high overpotential required for redox reactions, hydrogen peroxide is not suitable for direct electroche...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04B82Y40/00G01N27/30
Inventor 高峰陆轻铱庞欢陈群刘荣梅
Owner NANJING UNIV
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