Map Sapling Learning macmillan learning Shown below is a chemical-sensing field

Question

Map Sapling Learning macmillan learning Shown below is a chemical-sensing field effect transistor (FET) in the absence of an applied gate potential. Explain how a chemical-sensing FET generates a response to an analyte by arranging the following statements in order. First Step (Gate) Drain Source A voltage is applied between the source and the drain, but no current flows. Metal contact Depletion Sion insulator The sample is introduced to the gate. region A positive potential is applied to the gate, which attracts electrons from the base. The current flowing between the source and the drain changes A current flows between the source and drain as a conductive channel forms. Analyte adsorbs onto the chemically-sensitive gate, resulting in a change in potential of the gate. o O (Base A potential is applied to the external circuit to return the current to its original value Last Step Electrical contact between source and base Incorrect. Whereas other statements may also be misplaced, after a potential is applied between the source and drain, a potential is applied to the gate.

Explanation / Answer

A voltage is applied between source and the drain, but no current flows. A positive potential is applied to the gate which attracts electrons from the base. A current flows between the source and drain as a conductive channel forms. The sample is introduced to the gate. Analyte absorbs onto the chemically sensitive gate, resulting in a change in potential of the gate. The current between the source and drain changes. A potential is applied to the external circuit to return of the current to its original value.

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