Development of a source–drain electrode coated with an insulation layer for detecting concentration changes in a nitrate ion solution

Development of a sensor-array chip with immobilized antibodies and the application of a wireless antigen-screening system

“…tor (side B) to increase. In this case, the relationship between the source-drain electrode current and the sensor voltage follows Ohm's law [26]. Based on this principle, a source-drain electrode produces a signal in response to changes in current originating from antigen-antibody reactions at the boundary surface on the insulator layer.…”

“…Fig. 3 shows a schematic of the structure and detection mechanism of a source-drain electrode coated with an insulation layer of submicron-order thickness, as we previously reported [26]. When a liquid is deposited on the surface of an insulator, an electric double layer arises at the boundary surface.…”

“…We previously reported on the standard properties of a developed chemical sensor that had been mounted on a chip with a source-drain electrode coated with an insulator layer [26]. Pure NaNO 3 solutions of 1.0 × 10 −6 to 1.0 mol L −1 (1 L) was applied to the insulated electrode, and the electrical response was evaluated by measuring the detection voltage.…”

“…The degree of polarization of an insu- lator is based on the concentration of the sample solution. Based on this principle, the source-drain electrode with an insulator can be used to measure the concentration of a liquid [26]. Fig.…”

“…4 shows the detection mechanism of antigen molecules using a present sensor. It is widely known that an ionic layer, like an electric double layer, is formed at the surface of solids and liquids [26]. When a liquid is deposited on the surface of an insulator with immobilized antibodies (Fig.…”