Non-enzyme sensor, non-enzyme sensor element and fabricating method thereof
A fabricating method of a non-enzyme sensor element includes a printing step, a coating step and an electroplating step. In the printing step, a conductive material is printed on a surface of a substrate to form a working electrode, a reference electrode and an auxiliary electrode, and a porous carbon material is printed on the working electrode to form a porous carbon layer. In the coating step, a graphene film material is coated on the porous carbon layer of the working electrode to form a graphene layer. In the electroplating step, a metal is electroplated on the graphene layer by a pulse constant current to form a catalyst layer including a metal oxide.
1. A non-enzyme sensor element for detecting a concentration of an analyte, and comprising:
a substrate; and
a conductive layer printed on a surface of the substrate, and the conductive layer having a working electrode, a reference electrode and an auxiliary electrode, wherein the working electrode comprises:
a porous carbon layer connected to the conductive layer;
a graphene layer connected to the porous carbon layer; and
a catalyst layer electroplated on the graphene layer, the catalyst layer comprises a metal oxide and is for oxidizing the analyte.
2. The non-enzyme sensor element of claim 1 , wherein the catalyst layer comprises a metal hydroxide.
3. The non-enzyme sensor element of claim 1 , wherein the analyte is a volatile fatty acid, a sugar or an alcohol.
4. The non-enzyme sensor element of claim 3 , wherein the volatile fatty acid is a lactic acid, the sugar is a glucose and the alcohol is an ethanol.
5. The non-enzyme sensor element of claim 4 , wherein when the analyte is the lactic acid and the non-enzyme sensor element has a concentration detecting range of the lactic acid, the concentration detecting range of the lactic acid is 1 mM to 50 mM.
6. The non-enzyme sensor element of claim 1 , wherein the substrate is a flexible polymer.
7. The non-enzyme sensor element of claim 1 , wherein the reference electrode comprises a silver chloride.
8. The non-enzyme sensor element of claim 1 , wherein the graphene layer is made by mixing a graphene powder and a proton exchange membrane.
9. The non-enzyme sensor element of claim 1 , wherein the non-enzyme sensor element is capable of detecting the concentration of the analyte in a basic environment.
10. A non-enzyme sensor for detecting a concentration of an analyte, comprising:
the non-enzyme sensor element according to the claim 1 configured to be used to oxidize the analyte to generate a current; and
a current sensor electrically connected to the non-enzyme sensor element and for converting the current to a concentration signal.