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Changes in resistance of (a) nanocomposite I gas sensors to ammonia vapor with various concentrations and (b) four repeated pulses of 250 ppm ammonia at room temperature. (c) Gas responses of nanocomposite I gas sensor to ammonia vapor with various concentrations. (d) Gas responses of nanocomposite I to 250 ppm ammonia vapor at room temperature compared with nanocomposite II, nanocomposite III, and TiO2@rGO/CNT gas sensors.
