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Preparation method and applications of graphene aerogel

A graphene aerogel and graphene technology, which is applied in the field of graphene materials, can solve the problems of high detection limit of micro-electrodes, inability to detect nitrate ions, etc., and achieve the effect of low detection limit, sensitive detection, and widening research fields.

Active Publication Date: 2015-10-14
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the detection limit of the above-mentioned nitrate ion-selective microelectrodes is relatively high, and it is impossible to detect low-concentration nitrate ions.

Method used

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  • Preparation method and applications of graphene aerogel
  • Preparation method and applications of graphene aerogel
  • Preparation method and applications of graphene aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 50mg of solid graphene oxide and place it in 10mL double-distilled water, ultrasonicate for 30min to make a graphene oxide aqueous solution, transfer the aqueous solution into a 15mL cylindrical glass bottle, then transfer the glass bottle to a 25mL polytetrafluorohydrothermal solution In the kettle, keep the reaction at 160°C for 24h, and wait for the reaction kettle to cool down to room temperature to obtain a cylindrical product; pre-freeze the cylindrical product at -4°C; put the pre-frozen material into a freeze dryer , freeze-dried at -80°C for 12 h to obtain graphene airgel GAs.

[0036]Weigh 1 mg of GAs prepared in this example and ultrasonically disperse it in 0.5 mL of twice distilled water to form a 2.0 mg / mL suspension. 6 μL of graphene airgel suspension was drop-coated on the surface of the working electrode of the screen-printed electrode, and dried at room temperature to obtain a GAS-modified screen-printed electrode (referred to as SPE / GAS); 100 μL...

Embodiment 2

[0038] Weigh 20 mg of solid graphene oxide and place it in 20 mL of twice-distilled water, ultrasonicate for 30 minutes to make a graphene oxide aqueous solution, transfer the aqueous solution into a 25 mL polytetrafluorohydrothermal kettle A, and then place the polytetrafluorohydrothermal kettle A is transferred to a 100mL polytetrafluorohydrothermal kettle B, and the reaction is maintained at 120°C for 12h. After the reaction kettle is lowered to room temperature, a cylindrical product is obtained; the cylindrical product is pre-frozen at -2°C; The pre-frozen material was placed in a freeze dryer and freeze-dried at -40°C for 24 hours to obtain graphene airgel GAs.

[0039] Weigh 1 mg of GAs prepared in this example and ultrasonically disperse in 1 mL of twice distilled water to form a 1.0 mg / mL suspension. Take 10 μL of graphene airgel suspension drop-coated on the surface of the working electrode of the screen-printed electrode, and dry it at room temperature to obtain a G...

Embodiment 3

[0041] Weigh 50mg of solid graphene oxide and place it in 10mL double-distilled water, ultrasonicate for 30min to make a graphene oxide aqueous solution, transfer the aqueous solution into a 15mL cylindrical glass bottle, then transfer the glass bottle to a 25mL polytetrafluorohydrothermal solution In the kettle, the reaction was kept at 160°C for 24h, and the reaction kettle was lowered to room temperature to obtain a cylindrical product; the cylindrical product was placed in absolute ethanol for solvent exchange 5 times, and the product after the solvent exchange was transferred to CO 2 Drying in supercritical drying equipment, CO 2 Supercritical drying equipment parameters are: CO 2 Flow 1.2m 3 / h, the temperature is 40°C, the pressure is 14MPa, the time is 12h, and the graphene airgel GAs is obtained after drying.

[0042] The GAs prepared in this example were used for the all-solid-state nitrate ion selective electrode to detect nitrate ions, and the operation steps we...

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Abstract

The invention provides a preparation method and applications of graphene aerogel. The graphene aerogel is prepared by the following steps: oxidizing a graphene water solution, and then preparing the graphene aerogel through a hydrothermal method. The graphene aerogel can be used as an ion-selective electrode, and can be especially used as an ion-selective electrode to detect the nitrate ions. The graphene aerogel is innovatively used as an ion-selective electrode applied in electrochemical detection, the detection results are excellent, and the application range of graphene aerogel based materials is enlarged.

Description

technical field [0001] The invention relates to a graphene material, in particular to a preparation method and application of a graphene airgel. The graphene airgel can be used as an ion-selective electrode material, especially as an ion-selective electrode material for detection Nitrate ion. Background technique [0002] Graphene is a good solid transition material. At the same time, there are also reports that further discuss the influence of the number of layers of graphene on the performance of all-solid-state ion-selective electrodes. As the thickness increases, the current value also increases, indicating that the electrode's Capacitance increases. For solid-state ion sensors, it is very important to have a large redox capacitance, so the graphene layer that has been drip-coated many times is usually selected as the sensing unit for research. As the number of drip-coating increases, its capacitive current also increases increase. However, multi-layer modification wi...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 毛罕平严玉婷王坤左志强
Owner JIANGSU UNIV
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