Lactic acid detection electrode and method for producing the same

A method for producing a lactic acid detection electrode, comprising:

• a film layer formation step, which includes forming a composite material film layer on a substrate, the composite material film layer containing a graphene oxide (GO) and a metal oxide;
• a surface modification step, which includes performing a first laser process on a surface of the composite material film layer using an ultrafast laser to form a surface modification structure on the substrate;
• wherein the surface modification structure has a p-n heterojunction formed between a reduced graphene oxide reduced from the graphene oxide and the metal oxide, and wherein a conductivity type of the reduced graphene oxide is p-type, and a conductivity type of the metal oxide is n-type;
• and
• a pattern formation step, which includes performing a second laser process using the ultrafast laser to at least partially cut and remove the surface modification structure to partially expose the substrate, thereby forming an electrode pattern, wherein a surface of the electrode pattern has the surface modification structure;
• wherein the electrode pattern at least includes a first electrode and a second electrode, the first electrode has a first spiral line, and the second electrode has a second spiral line;
• wherein the first spiral line and the second spiral line respectively extend toward each other along a spiral path, and the first spiral line and the second spiral line are spirally wound around each other and spaced apart without contacting each other.