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Electrochemical sensor based on graphene molecular imprinting material, and preparation method thereof

A molecular imprinting and graphene dispersion technology, applied in the fields of material electrochemical variables, analytical materials, scientific instruments, etc., can solve the problems of cumbersome process, destruction of graphene conjugated π structure, time-consuming and other problems, and achieves simple operation and low cost. , the effect of good conductivity

Active Publication Date: 2015-02-25
湖州度信科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If vinyl-functionalized graphene is prepared by chemical bonding method, since the surface of graphene basically has no functional groups, and the surface of graphene oxide contains a large amount of oxygen-containing functional groups, it is necessary to introduce double bonds to the surface of graphene oxide by chemical bonding method first, and then ethylene The reduction of functionalized graphene oxide to vinyl-functionalized graphene is cumbersome, time-consuming, and may destroy the conjugated π structure of graphene.

Method used

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  • Electrochemical sensor based on graphene molecular imprinting material, and preparation method thereof
  • Electrochemical sensor based on graphene molecular imprinting material, and preparation method thereof

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Embodiment 1

[0016] Dissolve 80 mg of GO in 80 mL of DMF, sonicate for 1 h to form a stable light brown graphene oxide solution, add 20 μL of hydrazine hydrate, and react at 70 °C for 2 h to obtain a black uniform suspension. Suction filtration and washing 3 times, adding a certain amount of DMF to obtain a GR / DMF solution. 40 mg of N-vinylcarbazole was added to 100 mL of 0.5 mg / mL GR / DMF solution, followed by sonication for 2 h to obtain a graphene / N-vinylcarbazole complex. Add comonomer styrene to graphene / N-vinylcarbazole solution, pass 10min N 2 , add template molecule p-nitrophenol (20mg), cross-linking agent EGDMA (2mmol), initiator AIBN (10mg), pass 15minN 2 , heated to 70 °C for 24 h, and the product was centrifuged and washed several times to obtain a molecularly imprinted polymer on the surface of graphene. Add 5 μL of polymer aqueous solution dropwise to the clean glassy carbon electrode and let it dry naturally. The imprinted molecules were eluted with absolute ethanol for 4...

Embodiment 2

[0018] Dissolve 50 mg of GO in 100 mL of DMF, sonicate for 1 h to form a stable light brown graphene oxide solution, add 20 μL of hydrazine hydrate, and react at 90 °C for 4 h to obtain a black uniform suspension. Suction filtration and washing 3 times, adding a certain amount of methanol to obtain a graphene solution. 10 mg of 9-vinyl anthracene was added to 30 mL of 1 mg / mL graphene solution, followed by sonication for 1 h to obtain a graphene / 9-vinyl anthracene composite. Add comonomer methacrylic acid to graphene / 9-vinyl anthracene solution, pass 10minN 2 , add template molecule caffeine (10mg), cross-linking agent EGDMA (4mmol), initiator AIBN (16mg), pass 15minN 2 , heated to 65°C and reacted for 12h, the product was repeatedly centrifuged and washed several times to obtain a molecularly imprinted polymer on the surface of graphene. Add 10 μL of polymer aqueous solution dropwise to the clean glassy carbon electrode and let it dry naturally. The imprinted molecules wer...

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Abstract

The present invention provides an electrochemical sensor based on a graphene molecular imprinting material, and a preparation method thereof, and relates to the technical field of polymer material science and chemistry sensor combination. According to the present invention, graphene and a vinyl aromatic compound form vinyl functionalized graphene through the non-covalent interaction, free radical copolymerization is performed to prepare a graphene molecular imprinting polymer (GR / MIPs), and the GR / MIPs modified electrode, a reference electrode and a counter electrode are connected on an electrochemical workstation to form the electrochemical sensor of the graphene molecular imprinting material; the graphene and the vinyl aromatic compound are only required to be mixed according to the ratio so as to obtain the vinyl functionalized graphene through the non-covalent interaction, such that the operation is simple, the conditions are mild, the structure of graphene is not destroyed, and the graphene dispersity is improved; and the electrochemical sensor based on the graphene molecular imprinting material has advantages of rapid response, good selectivity, high sensitivity, good stability and the like.

Description

Technical field: [0001] The invention relates to the technical field of combining polymer material science and chemical sensors, in particular to an electrochemical sensor based on graphene molecularly imprinted material and a preparation method thereof. Background technique: [0002] Molecular imprinting technology is to "imprint" template molecules (or ions) on a certain substrate, so that the substrate has specific selectivity and binding ability for template molecules, which can be used for the separation, enrichment and detection of template molecules. However, molecularly imprinted polymers prepared by traditional methods usually have some problems, such as: irregular shape; imprinted sites are embedded too deeply, affected by steric hindrance, and the accessibility of internal imprinted holes is poor, resulting in molecularly imprinted polymers and templates. The binding of molecules is difficult, the binding rate is slow, and at the same time, the internal template m...

Claims

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Application Information

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IPC IPC(8): G01N27/403G01N27/48
Inventor 罗静丛姣姣刘杰高雅涵刘晓亚
Owner 湖州度信科技有限公司
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