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(a) Output voltage of MZO to acetone from 1 to 3 ppm in the traditional circuit and the interlocking p+n FET circuit (RL is 7.1 MΩ) in the humid atmosphere of 85%; (b) The change of output voltage (ΔV) to different gases at 2 ppm (RH = 85%) for MZO in the interlocking p+n FET circuit (RL is 7.1 MΩ).
