Naphthol green and hydrotalcite composite film modified hydrogen peroxide electrochemical sensor

A technology of chemical sensors and composite thin films, applied in the direction of electrochemical variables of materials, scientific instruments, instruments, etc., can solve problems such as difficult exposure, difficult transfer of electrons, poor chemical stability and thermal stability of enzyme molecules, etc., and achieve electrochemical signal Improvement, rapid electrocatalytic performance, good response effect

Inactive Publication Date: 2018-12-07
XIAN HUIZE INTPROP OPERATIONS MANAGEMENT CO LTD
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Problems solved by technology

At present, there are still many shortcomings in the application of such enzyme-based bioelectrochemical sensors in the field of detection, mainly reflected in: (1) poor chemical and thermal stability of enzyme molecules; (2) active sites of enzyme molecules Usually surrounded by peptide chains, the interior is not easily exposed, so it is difficult for electrons to transfer between the enzyme and the electrode

Method used

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  • Naphthol green and hydrotalcite composite film modified hydrogen peroxide electrochemical sensor
  • Naphthol green and hydrotalcite composite film modified hydrogen peroxide electrochemical sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. The preparation mass fraction is the naphthol green solution A of 1g / L;

[0020] 2. Preparation of nitrate hydrotalcite by ion exchange method:

[0021] a. Dissolve 0.01mol of solid Co(NO3)2·6H2O and 0.005mol of solid Al(NO3)3·9H2O and 0.06mol of urea in 50mL of deionized water in a 90 ml polytetrafluoroethylene pressure reaction vessel , crystallized at 120°C for 48 hours, centrifuged with deionized water until the pH was about 7, and dried at 50°C for 24 hours to obtain carbonate intercalated hydrotalcite powder;

[0022] b. Dissolve 0.3g of the above-mentioned carbonate intercalated hydrotalcite powder and 363.75g of solid NaNO3 in 300mL of deionized water without CO2. After uniform dispersion, add 0.09mL of concentrated nitric acid and stir at 20°C under a nitrogen atmosphere to perform ionization. After 24 hours of exchange reaction, it was centrifuged and washed with deionized hot water without CO2 until the pH was about 7, and vacuum dried at 50°C for 24 hour...

Embodiment 2

[0028] 1. The preparation mass fraction is the naphthol green solution A of 1g / L;

[0029] 2. With embodiment 1;

[0030] 3. Obtain clear transparent colloidal solution B with embodiment 1;;

[0031] 3. Grind the glassy carbon electrode sheet into a mirror surface with 0.05 μm Al2O3 powder, wash it with ultrapure water, and ultrasonically in concentrated nitric acid, absolute ethanol, and ultrapure water for 30 seconds, and put the cleaned glassy carbon electrode sheet in the solution Soak in A for 10 minutes, fully wash with deionized water, place in solution B, soak for 10 minutes and fully wash to obtain a cycle of naphthol green and hydrotalcite composite film;

[0032] 4. repeat step 3, 12 times, obtain naphthol green and hydrotalcite multilayer composite film, get hydrogen peroxide electrochemical sensor after vacuum drying.

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Abstract

The invention discloses a naphthol green and hydrotalcite composite film modified hydrogen peroxide electrochemical sensor. A preparation method comprises following steps: a hydrotalcite nanosheet colloidal solution and a naphthol green solution are prepared, a negatively charged glassy carbon electrode sheet obtained through processing is subjected to alternative assembling in the above two solutions so as to obtain the naphthol green and hydrotalcite multi-layer composite film modified electrochemical sensor. The advantages are that: hydrotalcite nanosheet is taken as an electroactive substance, is capable of realizing electric catalysis of hydrogen peroxide through self oxidation reduction reaction, layer-by-layer self assembling is adopted to realize bonding of the active components inmolecular level and nanometer scale controlling of the film, so that the obtained highly oriented film is capable of providing sensors with excellent current response.

Description

technical field [0001] The invention belongs to the technical field of electrochemical sensor preparation, in particular to a hydrogen peroxide electrochemical sensor modified with a composite film of naphthol green and hydrotalcite. Background technique [0002] In recent years, electrochemical biosensors have been widely demanded in the fields of biomedicine, environmental monitoring, food and pharmaceutical industry due to their high selectivity, high sensitivity, fast analysis, convenient operation and other advantages. In 1962, Clark first proposed the design principle of developing a glucose enzyme biosensor. On this basis, UPdike and Hicks successfully developed a glucose oxidase sensor in 1967, which was used to quantitatively detect the content of glucose in serum. Since then, research on biosensors based on enzyme electrodes has developed rapidly. At present, there are still many shortcomings in the application of such enzyme-based bioelectrochemical sensors in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N27/30
CPCG01N27/26G01N27/308
Inventor 蒋瑞莹
Owner XIAN HUIZE INTPROP OPERATIONS MANAGEMENT CO LTD
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