Chemical field-effect transistor

<p>A ChemFET is a chemically-sensitive field-effect transistor, that is a <a href="/facts/Field-effect_transistor/TerYC6Nz">field-effect transistor</a> used as a <a href="/facts/Sensor/RN8SXbjs">sensor</a> for measuring <a href="/facts/Chemical_concentration/wqBmz5od">chemical concentrations</a> in <a href="/facts/Chemical_solution/MGchhMQV">solution</a>. When the target <a href="/facts/Analyte/qWzKoY8L">analyte</a> concentration changes, the current through the <a href="/facts/Transistor/Bmr8zwL0">transistor</a> will change accordingly. Here, the analyte solution separates the source and <a href="/facts/Gate_electrode/TerYC6Nz">gate electrodes</a>. A concentration gradient between the solution and the gate electrode arises due to a semi-permeable membrane on the FET surface containing receptor moieties that preferentially bind the target analyte. This concentration gradient of charged analyte ions creates a chemical potential between the source and gate, which is in turn measured by the FET.
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Chemical field-effect transistor open-in-new

Chemical field-effect transistor