Shown below is a chemical-sensing field effect transistor (FET) in the absence o

Question

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 Metal contact Depletion Sion insulator O region O O O O o o (Base) Last Step Electrical contact between source and base The sample is introduced to the gate. A voltage is applied between the source and the drain, but no current flows. A current flows between the source and drain as a conductive channel forms. The current flowing between the source and the drain changes. A positive potential is applied to the gate, which attracts electrons from the base. Analyte adsorbs onto the chemically-sensitive gate, resulting in a change in potential of the gate. A potential is applied to the external circuit to return the current to its original value

Explanation / Answer

A chemical-sensing FET generates a response to an analyte in the following order:

1). A voltage is applied between the source and the drain, but no current flows.

2). The sample is introduce to the gate.

3). A positive potential is applied to the gate, which attracts electrons from the base.

4). The current flowing between the source and the drain changes.

5). A current flows between the source and drain as a conductive channel forms.

6). Analyte adsorbs onto the chemically-sensitive gate, resulting in a change in potential of the gate.

7). A potential is applied to the external circuit to return thecuttent to its original value.

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