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Ion-selective electrode based on graphene electrode and preparation method thereof

An ion-selective, graphene electrode technology, which is applied in the direction of material analysis, measuring devices, instruments, etc. by electromagnetic means, can solve the problems of unstable potential and poor repeatability, and achieves low cost, high specific capacitance, and simple preparation. Effect

Inactive Publication Date: 2012-06-20
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to overcome the deficiencies such as unstable potential and poor repeatability of coated ion selective electrodes in the prior art, and provide a kind of ion selective electrode based on graphene electrode, the electrode prepared with carbon material graphene as the substrate, Ion-selective electrodes are prepared by coating ion-selective polymer membranes, which have high potential stability, sensitivity and selectivity

Method used

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  • Ion-selective electrode based on graphene electrode and preparation method thereof
  • Ion-selective electrode based on graphene electrode and preparation method thereof
  • Ion-selective electrode based on graphene electrode and preparation method thereof

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Embodiment 1

[0033] The preparation of embodiment 1 electrode matrix and the comparison with glassy carbon electrode

[0034] The electrode base was prepared by the following two methods.

[0035] Method 1: Preparation of carbon paste electrodes based on chemically reduced graphene, including the following steps:

[0036](1) Preparation of graphene by chemical reduction method: take 20g of graphite powder, oxidize it with 460mL of concentrated sulfuric acid (98% by mass fraction) and 60g of potassium permanganate at about zero degree, then obtain graphite oxide through filtration, cleaning and ultrasonic stripping Then add 0.5mL reducing agent hydrazine (mass fraction is 35%) in 500mL graphene oxide dispersion liquid (mass fraction is 0.05%), graphene oxide is reduced into graphene, after filtering, in vacuum oven Dried to obtain graphene powder;

[0037] (2) Preparation of carbon paste electrode: Mix graphene powder with N-octylpyridine hexafluorophosphate in a mass ratio of 7:4, grind ...

Embodiment 2

[0042] Embodiment 2 Potassium ion selective electrode based on graphene electrode

[0043] The preparation of the potassium ion selective electrode based on graphene electrode specifically comprises:

[0044] (1) Preparation of carbon paste electrodes based on chemically reduced graphene: according to the corresponding steps of method 1 in embodiment 1, wherein, the carbon paste of carbon paste electrodes in step (2) consists of 0.7g graphene powder and 0.3g paraffin oil composition.

[0045] (2) drop-coat 30 μ L of polymer solution containing potassium ionophore on the surface of the carbon paste electrode prepared above, and place it to dry at room temperature to form a potassium ion-selective polymer film; wherein, the polymer solution contains a mass percent concentration of 1% of valinomycin, 33% of polyvinyl chloride, 65.8% of dinitrophenyl octyl ether, 0.2% of potassium tetrachlorophenyl boride, and the mass ratio of solvent tetrahydrofuran to all above-mentioned solut...

Embodiment 3

[0047] Embodiment 3 Calcium ion selective electrode based on graphene electrode

[0048] The preparation of the calcium ion selective electrode based on graphene electrode specifically comprises:

[0049] (1) Preparation of a surface-modified electrode based on electrochemically reduced graphene: according to the corresponding steps of method 2 in embodiment 1, wherein, step (2) is, 20 μ L graphene oxide dispersion (10 mg / L) is added dropwise on The surface of the glassy carbon electrode was dried under infrared light for 3 minutes, put into 0.1mol / L phosphate buffer solution (pH 4.5), and reduced for 300s under the condition of potential of -1.2V by electrochemical amperometry to prepare the surface Electrode substrate modified with graphene membrane.

[0050] (2) 30 μ L of polymer solutions containing calcium ionophores are drip-coated on the surface of the above-mentioned prepared electrode substrate modified with graphene membranes, and placed at room temperature to dry t...

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Abstract

The invention discloses an ion-selective electrode based on a graphene electrode, comprising an electrode base body and an ion-selective polymer film coated on the surface of the electrode base body, wherein the electrode base body is an electrode doped with graphene or decorated by a graphene film on the electrode surface by electro-deposition. The ion-selective electrode, provided by the invention, has the advantages of simple preparation, low cost, fast electron transfer, stable potential, high sensitivity, good selectivity and the like, is applied to detection of ion concentration in solution, and provides a new idea to development of the ion-selective electrode towards a microelectrode aspect.

Description

technical field [0001] The invention relates to the technical field of electrochemical sensors, in particular to an ion-selective electrode based on a graphene electrode and a preparation method thereof. Background technique [0002] Ion-selective electrode is a kind of electrochemical sensor that uses membrane potential to measure the activity or concentration of ions in solution. The ionic activity is directly related to the membrane potential. As an analytical and testing tool that can quickly, accurately, conveniently and selectively determine the content of certain ions in complex samples, ion-selective electrodes have been widely used in environmental monitoring, biomedical testing, chemical production, geological testing and other fields. The traditional ion selective electrode consists of a sensitive membrane, an inner liquid and a conductive element. However, due to the existence of filling liquid, this kind of sensor cannot be miniaturized. [0003] In the prior...

Claims

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Application Information

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IPC IPC(8): G01N27/333
Inventor 平建峰吴坚应义斌
Owner ZHEJIANG UNIV
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