Electrode surface modifying material as well as preparation method and application thereof

A technology for modifying materials and electrode surfaces, applied in the direction of electrochemical variables of materials, etc., can solve the problems of high price, thermodynamic and chemical instability, limited development and other problems, and achieve the effect of low cost, simple and feasible method, and good reproducibility.

Inactive Publication Date: 2015-01-28
SHANXI UNIV
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Problems solved by technology

Enzyme-type glucose sensors have good selectivity and high sensitivity, but their high pr

Method used

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  • Electrode surface modifying material as well as preparation method and application thereof
  • Electrode surface modifying material as well as preparation method and application thereof
  • Electrode surface modifying material as well as preparation method and application thereof

Examples

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Embodiment Construction

[0016] Preparation of electrode surface modification material PVP-GR / NiNPs / Chit suspension and determination of glucose.

[0017] 1. Preparation of polyvinylpyrrolidone functionalized graphene (PVP-GR):

[0018] (1) Add 2.5ml of 1mg / ml polyvinylpyrrolidone and 1mg / ml graphene oxide into 4.89ml of secondary water, and after electromagnetic stirring for 20min, add 100μl of 25% ammonia water and 10μl of 80% hydrazine hydrate under stirring state, and place in 60 °C in a water bath with electromagnetic stirring for 3.5 hours.

[0019] (2) At room temperature, centrifuge at 12000 rpm for 20 min, discard the supernatant, add 5 ml of secondary water to obtain 0.5 mg / ml polyvinylpyrrolidone functionalized graphene (PVP-GR), which is a black suspension.

[0020] 2. Preparation of PVP-GR loaded nickel nanoparticles (PVP-GR / NiNPs) composite:

[0021] At room temperature, add 1ml of PVP-GR prepared in step 1, add 2.4ml of secondary water, 100μl of 0.5mol / L nickel acetate, stir for 5min,...

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Abstract

The invention discloses an electrode surface modifying material as well as a preparation method and an application thereof, particularly relates to a dispersion liquid formed by dispersing polyvinylpyrrolidone-functionalized graphene-loaded nickel nano particles (PVP-GR/NiNPs) in a chitosan solution and a preparation method of the dispersion liquid. The dispersion fluid is dispensed on a regular clean electrode surface, dried under an infrared lamp, and activated by cyclic voltammetry in a NaOH solution to obtain a high-sensitivity enzyme-free glucose electrochemical sensor for glucose detection. The preparation method of the nano composite material disclosed by the invention is simple and quick, low in cost, and good in stability; and the prepared electrochemical sensor is high in sensitivity, wide in linear range and good in repeatability. The electrode surface modifying material is expected to be widely applied in the fields such as diagnosis of diabetes mellitus, clinical medicine and food process detection.

Description

technical field [0001] The invention relates to electrode surface modification materials, in particular to a suspension (PVP-GR / NiNPs) formed by dispersing polyvinylpyrrolidone functionalized graphene-loaded nickel nanoparticles (PVP-GR / NiNPs) in a chitosan (Chitosan) solution. NiNPs / Chit). Background technique [0002] Glucose is a very important compound. Human blood contains a certain concentration of glucose, referred to as blood sugar. Under normal circumstances, blood sugar maintains a dynamic balance, with fluctuations between 70-140mg / dl (3.9-7.8mmol / l). The sensing and monitoring of blood glucose concentration is of great significance to the diagnosis of human health and diseases. The sensing and detection of glucose has always been a hot topic in the research of electrochemical and biosensors. According to whether enzymes are added to electrochemical sensors, they can be divided into enzymatic glucose electrochemical sensors and non-enzymatic glucose electrochemi...

Claims

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Application Information

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IPC IPC(8): C01B31/04G01N27/30
Inventor 刘志广郭玉晶薛琼双少敏董川
Owner SHANXI UNIV
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