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(a) Synthesis of polypyrrole (PPy) on a single-layer graphene/polyethylene terephthalate (SLG/PET) film using a three-electrode system and representation of the electrochemical polymerization and structure after the application of 1, 10, and 70 cycles to the nanocomposite. (b) Assessment of the sensor selectivity for several gases at a concentration of 1 ppm. Adapted from [96], copyright 2018, Royal Society of Chemistry.
