Diffusion control layer for use in electrochemical sensors

A method of forming an electrochemical sensor, the method comprising:

• forming a common reference electrode;
• forming at least one counter electrode;
• and
• forming a work electrode platform comprising a work electrode and at least one diffusion control layer, wherein the work electrode is electrically coupled to the common reference electrode, wherein the work electrode comprises a reagent substrate configured to react with an analyte to produce a signal indicative of a concentration of the analyte, and wherein the at least one diffusion control layer is configured to control the diffusion of the analyte to the work electrode.