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Output voltage of Mn-doped ZnO (MZO) to (a) formaldehyde from 40 to 160 ppm and (b) acetaldehyde from 1000 to 2000 ppm; (c) toluene from 100 to 400 ppm (d) ethanol from 3 to 4 ppm in the traditional circuit and the interlocking p+n FET circuit (RL is 7.1 MΩ) under humidity of 25%.
