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(a) In situ polymerization of polypyrrol onto rGO via oxidative exfoliation and reduction. (b) Response of rGO, neat PPy, and rGO/PPy nanocomposite to 1–10 ppm of NH3. (c) Selectivity of rGO/PPy to different gases at a concentration of 10 ppm. Adapted from [98], copyright 2017, with permission from Elsevier.
