Flexible pH sensor and detection system

Patent metadata

Field	Value
Publication number	US-12287304-B2
Application number	US-202418773416-A
Country	US
Kind code	B2
Filing date	Jul 15, 2024
Priority date	Nov 20, 2023
Publication date	Apr 29, 2025
Grant date	Apr 29, 2025

Abstract

Disclosed are a flexible pH sensor and detection system, belonging to the technical field of sensors. A material that does not react with electrolyte is mixed with metals to print an anode substrate, and one-step synthesis of a metal ions doped polyaniline composite material is realized through an electrochemical method. The doping amount of metal ions in polyaniline is changed by controlling metal content; due to addition of the metals, the conductivity of the anode substrate is improved, which is conducive to the deposition of polyaniline; such one-step method for preparing the polyaniline composite material is simpler, low in cost, and pollution-free; and compared with pure polyaniline, the sensitivity is further improved. According to the solution, this material is applied to the pH sensor for the first time, achieving a wide pH detection range (2-12) and high bending stability.

First claim

What is claimed is:

1. A preparation method for a flexible pH sensor, wherein the flexible pH sensor comprises a pH sensitive electrode and a pH reference electrode, wherein the preparation method of the pH sensitive electrode comprises:
step (1): preparing a first electrode by using a composite conductive material as a conductive layer and a flexible thin film as a substrate, wherein the composite conductive material comprises two conductive materials, respectively; and
step (2): preparing an electrolyte solution containing an acid and aniline, adopting cyclic voltammetry to prepare a polyaniline/cation composite material by using the first electrode prepared in step (1) as a working electrode in combination with a reference electrode and a counter electrode, and drying the deposited polyaniline/cation composite on the first electrode to obtain the pH sensitive electrode;
wherein one of the conductive materials in step (1) is a material that does not react with the electrolyte solution and serves as a growth substrate for polyaniline; and the other conductive material in step (1) is an insoluble and easily electrolyzed material that is oxidized after being applied with voltage during the cyclic voltammetry so as to provide cations for the polyaniline/cation composite material;
wherein the conductive material that does not react with the electrolyte comprises carbon, FTO, platinum, or gold;
wherein the other conductive material comprises one or more of silver, aluminum, iron, tungsten, zinc, and calcium.

2. The preparation method according to claim 1 , wherein in the composite conductive material, a mass ratio of the conductive material to the other conductive material is (3-20):1.

3. The preparation method according to claim 1 , wherein the acid is selected from the group consisting of sulfuric acid, hydrochloric acid, phosphoric acid, oxalic acid, dodecylbenzene sulfonic acid, or salicylic acid.

Assignees

• Univ Jiangnan

Inventors

• Zhang Jie
• Shang Fenglong
• Li Fei
• Nan Siqi
• Meng Xin
• Zhang Baobing
• Zhang Tianwei
• Wang Xuhui

Classifications

• C25D15/00

  Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires · CPC title

• C25D13/08

  by polymerisation in situ of monomeric materials {(not used, see C09D5/4476)} · CPC title

• C25D5/18

  Electroplating using modulated, pulsed or reversing current · CPC title

• G01N27/301 Primary

  Reference electrodes · CPC title

• G01N33/02

  Food · CPC title