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MXene nanosheet modification-based all-solid-state ion-selective electrode and preparation method thereof

An ion-selective and nano-sheet technology, which is applied to the electrochemical variables of materials, material analysis by electromagnetic means, and measurement devices, can solve the problems of unstable potential and poor repeatability of coated ion-selective electrodes, and achieve improved electronic performance. The effect of transfer rate, low cost and simple preparation

Active Publication Date: 2019-02-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides an all-solid-state ion-selective electrode modified based on MXene nanosheets and a preparation method thereof in order to overcome the shortcomings of existing coated ion-selective electrodes, such as unstable potential and poor repeatability.

Method used

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  • MXene nanosheet modification-based all-solid-state ion-selective electrode and preparation method thereof
  • MXene nanosheet modification-based all-solid-state ion-selective electrode and preparation method thereof
  • MXene nanosheet modification-based all-solid-state ion-selective electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Ti 3 C 2 Preparation of nanosheets:

[0047] (1) Add 1 gram of LiF powder to 20 ml of HCl reagent with a concentration of 6 mol / L, add a magnetic rotor to stir, and stir for 10 minutes at a stirring rate of 500 rpm to obtain an etchant;

[0048] (2) Add 1 gram of Ti after sieving 3 AlC 2 The powder (>400 mesh) is slowly added to the above mixed etchant. After the addition is completed, close the beaker, and perform etching reaction for 24 hours at a temperature of 35°C and a stirring rate of 500rpm in a constant temperature magnetic stirring device;

[0049] (3) After etching, transfer the sample to a plastic centrifuge tube and run it at 3500 rpm for 10 minutes with a centrifuge. Then remove the supernatant, keep the precipitate, add deionized water into the centrifuge tube, and shake fully to resuspend the precipitate. Repeat the centrifugation steps above until the pH of the supernatant reaches 5-6. Afterwards, the supernatant was poured out, and deionized wat...

Embodiment 2

[0051] An all-solid-state calcium ion selective electrode made of Ti 3 C 2 Nanosheet modified glassy carbon electrode and calcium ion selective polymer membrane.

[0052] The preparation method of the all-solid-state calcium ion selective electrode is as follows:

[0053] (1) 10 μL of Ti prepared in Example 1 3 C 2 The nanosheet dispersion (concentration: 5 mg / mL) was added dropwise on the surface of the glassy carbon electrode, dried in a vacuum oven at room temperature to form a film, and the desired Ti 3 C 2 Nanosheet modified electrodes;

[0054] (2) Ti that will be prepared 3 C 2 Rinse the surface of the nanosheet-modified electrode with pure water, dry it under a nitrogen atmosphere, drop 100 μL of the calcium ion polymer membrane solution, and dry it at room temperature for 24 hours to obtain it;

[0055] The calcium ion polymer membrane solution is composed of calcium ionophores, polymers, plasticizers, lipophilic macromolecules and solvents;

[0056] The calc...

Embodiment 3～8

[0063] Compared with Example 2, the difference is that the calcium ionophore is replaced by ETH 1001, 10,19-bis[(octadecylcarbamoyl) methoxyacetyl]-1,4,7, respectively. 13,16-Pentaoxa-10,19-diazacyclohecodecane, (-)-(R,R)-N,N'-di-[11-(ethoxycarbonyl)undecyl ]-N,N',4,5-tetramethyl-3,6-dioxa-octane-diamide, diethyl N,N'-[(4R,5R)-4,5-dimethyl -1,8-dioxo-3,6-dioxaoctylene]bis(12-methylaminolaurate), N,N,N',N'-tetracyclohexyl-3-oxapentyl One of diamide, tert-butyl-calix[4]arene tetrakis[2-(diphenylphosphoryl) ether], and other parameters are the same as in Example 2.

[0064] After testing, the performance of the all-solid-state calcium ion selective electrode prepared in Examples 3-8 is similar to that of the all-solid-state ion-selective electrode prepared in Example 2.

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Abstract

The invention discloses an MXene nanosheet modification-based all-solid-state ion-selective electrode. The MXene nanosheet modification-based all-solid-state ion-selective electrode comprises an electrode matrix, an MXene nanosheet modification layer and an ion-selective polymer membrane, wherein the MXene nanosheet modification layer and the ion-selective polymer membrane are sequentially wrappedonto the electrode matrix; applied MXene is a transition metal carbide or carbonitride two-dimensional crystal with a chemical formula of M1+1Xn, wherein n=1, 2 or 3, M is a transition metal element,and X is carbon and / or nitrogen elements. The invention also discloses a preparation method of the MXene nanosheet modification-based all-solid-state ion-selective electrode. The MXene nanosheet modification layer can greatly improve the electron transfer velocity between the electrode matrix and the ion-selective polymer membrane and meanwhile reduce external influence on electrode performance.Therefore, compared with traditional coated ion-selective electrodes, the MXene nanosheet modification-based all-solid-state ion-selective electrode not only has the advantages of stable potential, good repeatability and the like, but also is low in cost and simple in preparation.

Description

technical field [0001] The invention relates to the technical field of electrochemical sensors, in particular to an all-solid-state ion-selective electrode modified based on MXene nanosheets 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 test 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 and 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 the inner filling liquid, this kind of sensor cannot be developed...

Claims

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Application Information

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IPC IPC(8): G01N27/333G01N27/30
CPCG01N27/307G01N27/3335
Inventor 平建峰邵雨舟姜成美姚瑶
Owner ZHEJIANG UNIV
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