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(a) Response curves of (a) PANI_only and (b–f) Pd-PANI nanohybrids toward different methanol concentrations: (a) 2000 ppm; (b) 1 ppm; (c) 5 ppm; (d) 10 ppm; (e) 100 ppm; and (f) 2000 ppm. Adapted with permission from [63]; Copyright 2006, Elsevier B.V.
