Carbon heterostructure material/β-cyclodextrin composite modified electrode and preparation method

A technology of heterostructure and modified electrodes, applied in the field of electrochemical analysis and detection, can solve the problems of reducing the conductivity of graphene, destroying the lattice structure of graphene, etc., achieving good repeatability and reproducibility, broad application prospects, and manufacturing process. simple effect

Inactive Publication Date: 2011-12-21
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Covalent modification will destroy the lattice structure of graphene, while non-covalent modification often introduces non-conductive polymers, which reduces the conductivity of graphene. Even if metal nanoparticles are introduced, their size is mostly several nanometers or tens of nanometers, which is very It is difficult to effectively prevent the aggregation and stacking between the two-dimensional graphene sheets of hundreds of nanometers or even micrometers

Method used

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  • Carbon heterostructure material/β-cyclodextrin composite modified electrode and preparation method
  • Carbon heterostructure material/β-cyclodextrin composite modified electrode and preparation method
  • Carbon heterostructure material/β-cyclodextrin composite modified electrode and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of graphite oxide

[0026] Add 1g of graphite to 2mL of concentrated sulfuric acid with a concentration of 95wt%, 0.5g of potassium persulfate, and 0.5g of phosphorus pentoxide, react at 75°C for 5h, and centrifuge the product for 0.5h at a speed of 3000r·min -1 ,, washed with deionized water to pH 6.8, dried at 30 ° C to obtain pre-oxidized graphite. Add 0.2g of pre-oxidized graphite to 5mL of concentrated sulfuric acid with a concentration of 95wt%, stir at 0°C, slowly add 0.6g of potassium permanganate, stir and react at 35°C for 1h, raise the temperature to 90°C, and add 10mL of deionized Water, after the reaction is completed, add 28mL water and 0.5mL, 30wt% hydrogen peroxide mixture, filter, wash the product with 50mL, 3.6wt% hydrochloric acid solution until there is no sulfate ion, filter, and dry at 30°C to obtain oxidised graphite.

[0027] (2) Preparation of carbon heterostructure material / β-cyclodextrin complex modified electrode

[0028] A...

Embodiment 2

[0035] (1) Preparation of graphite oxide

[0036] Add 2g of graphite to 5mL of concentrated sulfuric acid with a concentration of 96wt%, 1g of potassium persulfate, and 1g of phosphorus pentoxide, react at 76°C for 6h, and centrifuge the product for 1h at a speed of 4000r·min -1 , washed with deionized water to pH 7.0, and dried at 35°C to obtain pre-oxidized graphite. Add 0.6g of pre-oxidized graphite to 15mL of concentrated sulfuric acid with a concentration of 96wt%, stir at 1°C, slowly add 1.8g of potassium permanganate, stir and react at 38°C for 1h, raise the temperature to 92°C, add 30mL of deionized Water, after the reaction is completed, add 84mL of water and 1.5mL, 30wt% hydrogen peroxide mixture, filter, wash the product with 150mL, 3.7wt% hydrochloric acid solution until there is no sulfate ion, filter, and dry at 35°C to obtain oxidised graphite.

[0037] (2) Preparation of carbon heterostructure material / β-cyclodextrin complex modified electrode

[0038] A. Ta...

Embodiment 3

[0044] (1) Preparation of graphite oxide

[0045] Add 4g of graphite to 8mL of concentrated sulfuric acid with a concentration of 97wt%, 2g of potassium persulfate, and 2g of phosphorus pentoxide, react at 78°C for 7h, and centrifuge the product for 1.5h at a speed of 5000r·min -1 ,, washed with deionized water to pH 7.2, dried at 40 ° C to obtain pre-oxidized graphite. Add 1g of pre-oxidized graphite to 25mL of concentrated sulfuric acid with a concentration of 97wt%, stir at 2°C, slowly add 2.4g of potassium permanganate, stir and react at 40°C for 1.5h, raise the temperature to 95°C, and add 50mL of deionized Water, after the reaction is completed, add 140mL of water and 2.5mL, 30wt% hydrogen peroxide mixture, filter, wash the product with 250mL, 3.6wt% hydrochloric acid solution until there is no sulfate ion, filter, and dry at 40°C to obtain oxidised graphite.

[0046] (2) Preparation of carbon heterostructure material / β-cyclodextrin complex modified electrode

[0047]...

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Abstract

The invention relates to a carbon heterostructure material / beta-cyclodextrin complex modified electrode and a preparation method thereof, belonging to the technical field of electrochemical analysis and detection. The carbon heterostructure material / beta-cyclodextrin complex is loaded on the surface of a glassy carbon electrode and forms a uniform film on the surface of the electrode, the content of carbon heterostructure materials on the surface of the electrode is 3.40-20.80mu g.cm<-2>, and the content of the beta-cyclodextrin on the surface of the electrode is 17.00-79.30mu g.cm<-2>. The carbon heterostructure material of the modified electrode is obtained through hybridization of two-dimensional grapheme and a one-dimensional carbon nanotube and is further compounded with the beta-cyclodextrin with supramolecular properties, an appropriate amount of mixture suspension is dropped on the clean surface of the electrode and is dried naturally, and thus the carbon heterostructure material / beta-cyclodextrin complex modified electrode can be obtained. The invention has the advantages of simple process, low cost, high sensitivity, low detection limit and good repeatability and reproducibility. The carbon heterostructure material / beta-cyclodextrin complex modified electrode can be applied in rapid and high-sensitivity onsite detection in the medical, environmental, food andother fields.

Description

technical field [0001] The invention belongs to the technical field of electrochemical analysis and detection, and in particular relates to a carbon heterostructure material / β-cyclodextrin composite modified electrode and a preparation method. Background technique [0002] Graphene is a new type of carbonaceous material. Carbon atoms are tightly packed into a single-layer honeycomb two-dimensional lattice structure. Its perfect two-dimensional crystal structure makes it have many unique and excellent physical, chemical and mechanical properties. Graphene With high specific surface area, thermal conductivity, carrier mobility, etc., these excellent properties and unique nanostructure make graphene show broad application prospects in electronic devices, energy storage, electrochemistry and other fields. However, the graphene prepared by the chemical redox method is easy to re-stack or aggregate, which weakens or disappears the unique properties of the original single-layer gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30C01B31/04
Inventor 陈旭翟瑞瑞杨文胜
Owner BEIJING UNIV OF CHEM TECH
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