Flexible pH sensor and detection system

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.