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The response performance of sensing devices based on assembled Py-rGO sheets. (a) Plot of normalized resistance change versus time for the sensing device based on assembled Py-rGO upon exposure to NH3 gas with concentrations ranging from 5 ppb to 100 ppm: a, 5 ppb; b 50 ppb; c, 10 ppm; d, 50 ppm; and e, 100 ppm. (b) Relationship of response variation of the Py-rGO sensor as a function of NH3 concentration.
