Chemicals including PVA with an average molecular weight of 15,000, hydrochloric acid (37%), pyrrole, glutaraldehyde (50% aqueous solution), poly(ethylene glycol) diacrylate [number-average molecular weight (Mn), ~700], chitosan with low molecular weight, 2,2′-azobis(2-methylpropionitrile), and ammonium persulfate were purchased from Sigma-Aldrich. All the materials were used without further purification.

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