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(a) Mechanism of in situ chemical oxidation polymerization mechanism of PPy on rGO. (b) Response rGO, PPy, and rGO/PPy hybrids to 1–10 ppm of NH3. (c) Selectivity of rGO/PPy to 10 ppm different gases. Adapted with permission from ref (24). Copyright 2017, Elsevier.
