One-dimensional nanostructured conducting composites prepared by coating cellulose nanofibers with thin conducting polymer layers

摘要

Conducting nanocomposites of cellulose nanofiber (CN) and polypyrrole (PPy) were prepared through in situ chemical oxidative polymerization of pyrrole monomers on the surface of the CNs by using FeCl3 as oxidant agent, and NaCl and sodium dodecylbenzene sulfonate (DBSNa) were selected as doping agents, respectively. The resulting PPy/CN nanocomposites were characterized using field-emission scanning electron microscopy (FE-SEM), fourier transform infrared (FT-IR) spectroscopy, thermogravimetric (TG) analysis, and cyclic voltammetry (CV). It was found that a continuous sheath of PPy formed on the surface of the CNs, and the thickness of the sheath layers increased with the increase of the ratio of the CNs and pyrrole monomers. More importantly, the electrical conductivities of the composites increased due to the formation of a continuous PPy layer that coated the nanofiber surface, and a strong doping effect on the thermal stability and electrochemical properties was observed. The results from cyclic voltammetry and EIS further showed that the stability and specific capacitance of the nanocomposites were higher than that of pure PPy, and compared that for the nanocomposite by using NaCl as a dopant, better capacitance properties for the nanocomposite by using DBSNa as the doping agent can be achieved.