Method for improving stability of electrochemical sensor

A method for improving stability of an electrochemical sensor, comprising the following steps:

• S1, manufacturing an electrochemical sensor, wherein a process for manufacturing the electrochemical sensor comprises micro/nanofabrication and screen printing;
• and
• wherein the electrochemical sensor is a three-electrode system comprising a reference electrode, a working electrode, and a counter electrode, or a two-electrode system comprising the working electrode and the reference electrode, or a two-electrode system comprising the working electrode and the counter electrode;
• and the working electrode is one or a combination of more selected from the group consisting of gold, platinum, and carbon;
• S2, immobilizing a biosensitive molecular enzyme on the working electrode of the electrochemical sensor;
• S3, setting an immobilization agent on a surface of the biosensitive molecular enzyme with the immobilization agents of polyaniline (PANI) and glutaraldehyde (GA);
• and
• S4, adding a protective film with a multilayer structure consisting of polyurethane (PU), polyvinyl alcohol (PVA), and polyethylene glycol (PEG) on a surface of the immobilization agent, such that the protective film is deposited on the working electrode to improve the stability of the electrochemical sensor.