Screen printed electrodes are prepared by using screen printing technology. By depositing one or several layers of printing ink in a certain sequence on the insulation support body or substrate, screen printed electrode can be obtained, and the printing ink can be gold, silver, platinum, carbon ink and the others. The basic principles of the preparation process are described below. The mesh of screen printed plate image part can pass through the ink and the ink would leak to the substrate. The rest of the plate are blocked, and the ink cannot go through, so the blank formed in the substrate. Therefore, only the specific area can form screen printed structure. Screen printed electrode is a flexible sensor element with special recognition, high sensitivity, low cost and commercial production. Screen printed electrode can provide reliable basis for the development of portable sensors, on-line and real-time detection and fast analysis, which has a great application prospect in many fields.
Figure 1. An example of screen printed electrode applied in food testing field.
According to the electrode systems, screen printing electrodes can be divided into two-electrode screen printed electrode and three-electrode screen printed electrode.
Figure 2. Fabrication of three-electrode screen printed electrode on chemically inert substrate.