2. Experimental
2.1. Materials
Aniline and pyrrole monomers were purchased from Sinopharm
Chemical Reagent Co., Ltd. which were purified through
distillation under reduced pressure and stored refrigerated before
use. All other reagents including sulfuric acid (H2SO4), hydrochloric
acid (HCl), potassium permanganate, hydrogen peroxide, hydrazine
monohydrate and ammonium persulfate (APS) were obtained
from Sinopharm Chemical Reagent Co., Ltd. which were used as
received without further treatment. Natural flake graphites were
provided from Qingdao BCSM Co., Ltd. All the solutions were
prepared using deionized water.