Discussion
A nanomaterial gas sensor responds sensitively because adsorption of the gas changes the material's
Answer: D
Correct answer: electrical conductance measurably
A gas adsorbing on a nanostructured semiconductor donates or withdraws electrons, changing the carrier concentration in a body so thin that the surface effect dominates the whole conductance. The response is large, fast and reversible, which is what makes tin oxide and zinc oxide nanostructures useful as sensors.
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