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A kind of electrochemical sensor based on graphene molecularly imprinted material and preparation method thereof

A technology of molecular imprinting and graphene dispersion, which is applied in the direction 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 achieve simple operation and low cost , good electrical conductivity

Active Publication Date: 2017-06-06
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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  • A kind of electrochemical sensor based on graphene molecularly imprinted material and preparation method thereof
  • A kind of electrochemical sensor based on graphene molecularly imprinted material and preparation method thereof

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Embodiment 1

[0021] Dissolve 80 mg GO in 80 mL DMF and 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 for 3 times, adding a certain amount of DMF to obtain GR / DMF solution. Add 40 mg of N-vinyl carbazole to 100 mL of 0.5 mg / mL GR / DMF solution, and sonicate for 2 h to obtain a graphene / N-vinyl carbazole composite. Add the comonomer styrene to the graphene / N-vinylcarbazole solution and let it pass for 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 hours, and the product was repeatedly centrifuged and washed several times to obtain a molecularly imprinted polymer on the graphene surface. Add 5 μL of polymer aqueous solution dropwise on a clean glassy carbon electrode and let it dry naturally. The imprinted molecules were eluted with abs...

Embodiment 2

[0023] Dissolve 50 mg GO in 100 mL DMF and sonicate for 1 h to form a stable light brown graphene oxide solution. Add 20 μL 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. Add 10 mg of 9-vinyl anthracene to 30 mL of 1 mg / mL graphene solution, and sonicate for 1 h to obtain a graphene / 9-vinyl anthracene composite. Add comonomer methacrylic acid to the graphene / 9-vinylanthracene solution, pass through for 10minN 2 , add template molecule caffeine (10mg), cross-linking agent EGDMA (4mmol), initiator AIBN (16mg), pass 15minN 2 , heated to 65° C. for 12 hours, and the product was repeatedly centrifuged and washed several times to obtain a molecularly imprinted polymer on the graphene surface. Add 10 μL of polymer aqueous solution dropwise on a clean glassy carbon electrode and let it dry naturally. The imprinted molecules were eluted with ...

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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

[0001] Technical field: [0002] 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 materials and a preparation method thereof. [0003] Background technique: [0004] 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, so that it 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; too deep embedding of imprinted sites, affected by steric hindrance, poor accessibility of internal imprinted cavities, resulting in molecularly imprinted polymers and templates The combination of molecules is difficult, the binding rate is slow, and the internal template molec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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