Methane sensor

A methane sensor, comprising

• a substrate, a conductive connection electrode, and a sensing electrode, wherein the conductive connection electrode is arranged on the substrate;
• the conductive connection electrode is an electrochemical electrode, including two electrodes or three electrodes, when there are two electrodes, it is a working electrode and a counter electrode, when there are three electrodes, it is a working electrode, a reference electrode and a counter electrode;
• the conductive connection electrode serves as a wire that is connected to a detection instrument or a circuit board through an interface, and is connected to the sensing electrode;
• the sensing electrode is covered on the conductive connection electrode, the sensing electrode is a layer of a conductive polymer film, and the conductive connection electrode is coated with an insulating layer in addition to a sensing area;
• and the sensing electrode is configured to capture methane molecules, so that a current response of the methane sensor changes due to change of a resistance of the sensing electrode caused by the presence of methane;
• the conductive polymer is poly (3,4-ethylenedioxythiophene):
• poly (styrene sulfonic acid) (PEDOT:PSS), and the conductive polymer is made into the conductive polymer film by a screen printing method, a printing method, or a coating method;
• and
• the conductive connection electrode connects with the sensing electrode.