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Resistance variation in (a) Pre-rGO-Sa exposed to 1, 5, and 10 ppm NO2 gas; (b) response time of Pre-rGO-Sa under 1 ppm of NO2 gas. Resistance variation in (c) rGO1-Sa #1, (d) rGO3-Sa #1, and (e) rGO5-Sa #1 samples exposed to 1, 5, and 10 ppm NO2 gas. (f) Response time of rGO1-Sa #R3 under 1 ppm of NO2 gas.
