High-sensitivity nitrite ion electrode based on poly(3,4-ethylenedioxythiophene) and preparation method thereof

Abstract

The invention provides a high-sensitivity nitrite ion electrode based on poly(3,4-ethylenedioxythiophene). The high-sensitivity nitrite ion electrode sequentially comprises a metal wire, a conductive poly(3,4-ethylenedioxythiophene) film, a nitrite ion sensitive film and a glass tube from inside to outside. The nitrite ion sensitive film comprises a 3,4-ethylenedioxythiophene film - styrene sulfonic acid copolymer. The 3,4-ethylenedioxythiophene film - styrene sulfonic acid copolymer is adopted to serve as a film-forming material of the sensitive film and replace PVC in the prior art, has good compatibility with conductive poly(3,4-ethylenedioxythiophene) of an adjacent layer, improves interlayer acting force and reduces interlayer signal transmission loss, so that the sensitivity of the ion electrode is further enhanced, and the lower limit of the electrode detection concentration is as low as 108 mol / L. Adsorption points of the copolymer are increased, the ion adsorption capability of the copolymer is improved, and the detection range of nitrite ions is expanded.

Description

technical field

[0001] The invention belongs to the technical field of electrochemical analysis, in particular to a nitrite ion electrode, in particular to a high-sensitivity nitrite ion electrode based on polyethylenedioxythiophene and a preparation method thereof. Background technique

[0002] Ion Selective Electrode (ISE) is the application of electrochemical principles and technologies, using the relationship between the composition and content of the analyzed solution in the chemical cell and its electrochemical properties for chemical analysis. It is a useful tool with the advantages of , safety and non-toxicity, and is widely used in the fields of environment and chemistry.

[0003] Conductive polymers have attracted the attention of researchers for their specific optical properties, electrical properties, and redox properties. His invention not only improves the performance and gives new functions to various structural materials, but also provides new substances for...

Examples

Embodiment 1

[0023] (1) Polish the surface of the silver wire smooth, put it in 15% hydrochloric acid aqueous solution and ultrasonically clean it for 15 minutes, then rinse it with deionized water and dry it;

[0024] (2) Mix 10g of 3,4-ethylenedioxythiophene and 6g of 15% hydrochloric acid aqueous solution evenly, place the cleaned silver wire in it, and scan at 0-1.6 Cyclic voltammetry scans the active electrode within the V potential range, and continuously scans for 10 cycles, so that a layer of conductive polyethylene dioxythiophene film is coated on the surface of the silver wire, wherein the silver wire is used as the working electrode, and the saturated calomel electrode and the platinum electrode are used as references respectively. Comparative electrode and counter electrode;

[0025] (3) Mix 18g ethylenedioxythiophene-styrenesulfonic acid copolymer, 6g nitrite ionophore I, 12g 2-nitrophenyloctyl ether, 7g sodium cetylsulfonate and 57g chloroform Obtain a cationic shielding mem...

Embodiment 2

[0029] (1) Polish the surface of the gold wire to smooth, place it in 15% hydrochloric acid aqueous solution and ultrasonically clean it for 20 minutes, then rinse it with deionized water and dry it;

[0030] (2) Mix 10g of 3,4-ethylenedioxythiophene and 8g of 10% hydrochloric acid aqueous solution evenly, place the cleaned gold wire in it, and scan at 0-1.6 The active electrode was scanned by cyclic voltammetry within the V potential range, and the continuous scanning was performed for 15 cycles, so that a layer of conductive polyethylene dioxythiophene film was coated on the surface of the gold wire, wherein the gold wire was used as the working electrode, and the saturated calomel electrode and the platinum electrode were respectively used as reference Comparative electrode and counter electrode;

[0031] (3) Mix 20g ethylenedioxythiophene-styrenesulfonic acid copolymer, 5g nitrite ionophore I, 10g 2-nitrophenyloctyl ether, 5g sodium hexadecylsulfonate and 60g chloroform O...

Embodiment 3

[0035] (1) Polish the surface of the platinum wire smooth, put it in 15% hydrochloric acid aqueous solution and ultrasonically clean it for 30 minutes, then rinse it with deionized water and dry it;

[0036] (2) Mix 10g of 3,4-ethylenedioxythiophene and 7g of 12% hydrochloric acid aqueous solution evenly, place the cleaned platinum wire in it, and scan at 0-1.6 Cyclic voltammetry scans the active electrode within the V potential range, and continuously scans for 20 cycles, so that a layer of conductive polyethylene dioxythiophene film is coated on the surface of the platinum wire, wherein the platinum wire is used as the working electrode, and the saturated calomel electrode and the silver electrode are used as the reference respectively. Comparative electrode and counter electrode;

[0037] (3) Mix 25g ethylenedioxythiophene-styrenesulfonic acid copolymer, 8g nitrite ionophore I, 8g 2-nitrophenyloctyl ether, 8g sodium cetylsulfonate and 51g chloroform Obtain a cationic shiel...

technical field

[0001] The invention belongs to the technical field of electrochemical analysis, in particular to a nitrite ion electrode, in particular to a high-sensitivity nitrite ion electrode based on polyethylenedioxythiophene and a preparation method thereof. Background technique

[0002] Ion Selective Electrode (ISE) is the application of electrochemical principles and technologies, using the relationship between the composition and content of the analyzed solution in the chemical cell and its electrochemical properties for chemical analysis. It is a useful tool with the advantages of , safety and non-toxicity, and is widely used in the fields of environment and chemistry.

[0003] Conductive polymers have attracted the attention of researchers for their specific optical properties, electrical properties, and redox properties. His invention not only improves the performance and gives new functions to various structural materials, but also provides new substances for...

Examples

Embodiment 1

[0023] (1) Polish the surface of the silver wire smooth, put it in 15% hydrochloric acid aqueous solution and ultrasonically clean it for 15 minutes, then rinse it with deionized water and dry it;

[0024] (2) Mix 10g of 3,4-ethylenedioxythiophene and 6g of 15% hydrochloric acid aqueous solution evenly, place the cleaned silver wire in it, and scan at 0-1.6 Cyclic voltammetry scans the active electrode within the V potential range, and continuously scans for 10 cycles, so that a layer of conductive polyethylene dioxythiophene film is coated on the surface of the silver wire, wherein the silver wire is used as the working electrode, and the saturated calomel electrode and the platinum electrode are used as references respectively. Comparative electrode and counter electrode;

[0025] (3) Mix 18g ethylenedioxythiophene-styrenesulfonic acid copolymer, 6g nitrite ionophore I, 12g 2-nitrophenyloctyl ether, 7g sodium cetylsulfonate and 57g chloroform Obtain a cationic shielding mem...

Embodiment 2

[0029] (1) Polish the surface of the gold wire to smooth, place it in 15% hydrochloric acid aqueous solution and ultrasonically clean it for 20 minutes, then rinse it with deionized water and dry it;

[0030] (2) Mix 10g of 3,4-ethylenedioxythiophene and 8g of 10% hydrochloric acid aqueous solution evenly, place the cleaned gold wire in it, and scan at 0-1.6 The active electrode was scanned by cyclic voltammetry within the V potential range, and the continuous scanning was performed for 15 cycles, so that a layer of conductive polyethylene dioxythiophene film was coated on the surface of the gold wire, wherein the gold wire was used as the working electrode, and the saturated calomel electrode and the platinum electrode were respectively used as reference Comparative electrode and counter electrode;

[0031] (3) Mix 20g ethylenedioxythiophene-styrenesulfonic acid copolymer, 5g nitrite ionophore I, 10g 2-nitrophenyloctyl ether, 5g sodium hexadecylsulfonate and 60g chloroform O...

Embodiment 3

[0035] (1) Polish the surface of the platinum wire smooth, put it in 15% hydrochloric acid aqueous solution and ultrasonically clean it for 30 minutes, then rinse it with deionized water and dry it;

[0036] (2) Mix 10g of 3,4-ethylenedioxythiophene and 7g of 12% hydrochloric acid aqueous solution evenly, place the cleaned platinum wire in it, and scan at 0-1.6 Cyclic voltammetry scans the active electrode within the V potential range, and continuously scans for 20 cycles, so that a layer of conductive polyethylene dioxythiophene film is coated on the surface of the platinum wire, wherein the platinum wire is used as the working electrode, and the saturated calomel electrode and the silver electrode are used as the reference respectively. Comparative electrode and counter electrode;

[0037] (3) Mix 25g ethylenedioxythiophene-styrenesulfonic acid copolymer, 8g nitrite ionophore I, 8g 2-nitrophenyloctyl ether, 8g sodium cetylsulfonate and 51g chloroform Obtain a cationic shiel...