Preparation method of graphene-nanometer silver hydrogel electrode

A nano-silver and hydrogel technology, applied in the field of electrochemistry, can solve problems such as poor conductivity

Inactive Publication Date: 2018-06-08
TRULY OPTO ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Graphene oxide hydrogel electrodes can be used for ultrasensitive detection of biomacromolecules such as DNA (Adv.Funct.Mater.2014,24,6905–6913), but the graphene oxide hydrogel electrodes in the prior art Conductivity is still not ideal

Method used

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  • Preparation method of graphene-nanometer silver hydrogel electrode
  • Preparation method of graphene-nanometer silver hydrogel electrode

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preparation example Construction

[0031] The invention provides a kind of preparation method of graphene-nanometer silver hydrogel electrode, comprises the following steps:

[0032] Graphene oxide solution, silver nitrate solution and trisodium citrate solution are mixed and reacted to obtain a graphene-nano silver hydrogel electrode;

[0033] The concentration of the trisodium citrate solution is 1.8~2.2mmol / L;

[0034] The concentration of the silver nitrate solution is 4~6mg / mL;

[0035] The volume ratio of the graphene oxide solution, silver nitrate solution and trisodium citrate solution is (3-7):(0.3-0.6):(0.1-0.2).

[0036] In the present invention, graphene oxide solution is prepared according to the following steps:

[0037] A) graphite powder and sodium nitrate are mixed with concentrated sulfuric acid under ice bath conditions to obtain a mixed solution;

[0038] B) Potassium permanganate is added successively to the mixed solution for reaction, then deionized water is added successively to conti...

Embodiment 1

[0056] Mix 2g of natural graphite powder and 1g of sodium nitrate with 45mL of concentrated sulfuric acid in an ice bath;

[0057] Slowly add 5g of potassium permanganate to the above materials one by one, keep the temperature of the materials below 20°C and stir for 2h, then continue to react at 35°C for 30min, then slowly add 90mL of deionized water to the materials one by one, and raise the temperature to Continue to react at 95°C for 3 h, add pure water to terminate the reaction, and add 5 mL of 30% H at the same time 2 o 2 , cooled to room temperature;

[0058] The resulting material is subjected to suction filtration to obtain a filter cake;

[0059] Wash the above filter cake with hydrochloric acid aqueous solution and pure water successively to remove residual metal ions and hydrochloric acid, then redisperse the washed filter cake in water, and centrifuge at 2000rpm for 10min to remove unoxidized graphite to obtain a clear liquid;

[0060] Sonicate the supernatant ...

Embodiment 2

[0066] The graphene-nanometer silver hydrogel electrode was prepared according to the method in Example 1, except that the volume fractions of graphene oxide solution and trisodium citrate were 84% and 12%, respectively.

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Abstract

The invention provides a preparation method of a graphene-nanometer silver hydrogel electrode. The preparation method comprises following steps; an oxidized graphene solution, a silver nitrate solution, and a trisodium citrate solution are mixed, reaction is carried out so as to obtain the graphene-nanometer silver hydrogel electrode; the concentration of the trisodium citrate solution is controlled to be 1.8 to 2.2mol/L, the concentration of the silver nitrate solution is controlled to be 4 to 6mg/ml, and the volume ratio of the oxidized graphene solution to the silver nitrate solution to thetrisodium citrate solution is controlled to be (3-7) : (0.1-0.3) : (0.15-1.0). According to the preparation method, nanometer silver particles are introduced into oxidized graphene gel, so that the electrical conductivity of the graphene-nanometer silver hydrogel electrode is increased obviously; and in addition, nanometer silver is capable of providing binding sites of sulfhydrylation biologicalprobes, fixing the probe in a hydrogel electrode, and is beneficial for biological detection of the electrode.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a preparation method of a graphene-nanometer silver hydrogel electrode. Background technique [0002] The charges of graphene, graphene oxide and their reduction products make them have good dispersion, and they can also be used as functional building blocks through non-covalent interactions, such as van der Waals forces, hydrogen bonds, π-π interactions, and electrostatic interactions. etc., self-assembled or co-assembled with other functional building units to form hydrogels; there is also a strong solid-liquid interface between porous alumina and graphene oxide aqueous solution, which promotes the rapid enrichment of graphene oxide on the surface of alumina to form graphite oxide Alkene hydrogel (Chem. Commun., 2011, 47:5771-5773). In addition, using the non-covalent interaction between DNA and graphene oxide, in situ cross-linking graphene oxide, the pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/327C01B32/184B82Y30/00
CPCG01N27/327B82Y30/00
Inventor 钟勇吴雄清余德锋
Owner TRULY OPTO ELECTRONICS
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