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Relative response. The relative response to NH3 (1,000 ppm), C2H5OH (1,000 ppm), CO (1,000 ppm), H2S (1,000 ppm), NO2 (1,000 ppm), and H2O (80% RH) of sensors with difference ratio of P3HT:1.00 mol% Au/ZnO NPs (1:0, 1:1, 2:1, 3:1, 4:1, 1:2, and 0:1).
