Investigation On Technology And Mechanism Of Polypyrrole-Coated Conductive Paper Prepared Via In-Situ Polymerization

Polypyrrole(PPy) coated conductive paper was prepared via in-situ polymerization in pulp fiber suspension in this paper. The effects of pyrrole concentration and dopants on the electrical performance of conductive paper were studied. ATR-FTIR, XPS, SEM-EDXA, SEM and AFM were used to reveal the mechanism involved.It was found that pyrrole concentration, species and dosage of dopants have significant effect on the electrical performance of conductive paper.The surface resistivity of conductive paper decreased as the concentration of pyrrole increased. The adsorption efficiency showed that the increase of concentration of pyrrole resulted in higher amount of PPy coated on the fibers, which is an important factor of lowering the surface resistivity. SEM observation revealed that the PPy particles become larger as a result of the increase of pyrrole concentration; hence assist to improve the conductivity of conductive paper. The element analyses of Nitrogen of XPS and SEM-EDXA were in agreement with the adsorption efficiency, however, the doping level(S/N) first decreased then increased.For most sulfonate dopants adopted in this paper, the best performance of conductive paper was attained when the molar ratio of dopant to pyrrole was 1:1. PTSA and DBSA were superior to their corresponding salts. Using NSA or AQSA-Na as a dopant, the amount of PPy generated was larger than that doped with PTSA or/and PTSA-Na under the same experimental condition. SEM-EDXA and XPS implied that the dopant ions had been successfully incorporated into the structure of PPy chains. SEM-EDXA and XPS both displayed that cellulose/PPy doped with NSA or AQSA-Na had a higher doping level than that doped with PTSA or PTSA-Na. The analysis of valance state of XPS indicated that the higher doping level of cellulose/PPy doped with NSA or AQSA-Na could be ascribed to the stronger interaction between cellulose and the PPy chains. Morphology investigation of SEM and AFM demonstrated that particles of PPy incorporated NSA or AQSA-Na were much larger and more uniform when compared with those incorporated PTSA or PTSA-Na.