Conductive polyaniline/surfactant ion complex Langmuir-Blodgett films.
Organic-solvent-soluble amphiphilic polyanilne was prepared by ion complex formation of protonated polyaniline (PANI) and anionic surfactant dodecylbenzenesulfonic acid (DBSA). The amphiphilic PANI/DBSA ion complex shows stable monolayer behavior at the air-water interface and formation of LB films on solid substrates. The cyclic voltammograms for the monolayer PANI/DBSA LB films show two distinct redox process waves, that is, the quasi-reversible redox wave at around 0.05 V vs SCE as a lucoemeralidine/emeraldine couple and the symmetric surface wave behavior of PANI at 0.75 V vs SCE as an emeraldine/pernigraniline couple. The surface morphology of the monolayer PANI/DBSA LB film on a Si wafer shows that monolayer surface roughness is smooth at a molecular level with fiberlike bundle structures where the elongated main chains of polyanilines were assembled by pi-pi interaction of the polyanilines. Conductivity of PANI/DBSA LB films depends on the number of layers at less than four layers, and it becomes similar to the bulk conductivity, 0.5 S/cm, at more than four layers.
Aoki
Atsushi
A
Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-Chou, Shouwa-ku, Nagoya 466-8555, Japan. aaoki@nitech.ac.jp
Umehara
Ryota
R
Banba
Koji
K
D000814:Aniline Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D001557:Benzenesulfonates / Q000737:chemistry*; D004553:Electric Conductivity; D007477:Ions / Q000138:chemical synthesis / Q000737:chemistry; D008567:Membranes, Artificial; D015394:Molecular Structure; D010316:Particle Size; D012995:Solubility; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry*
D000814:Aniline Compounds; D001557:Benzenesulfonates; D007477:Ions; D008567:Membranes, Artificial; D013501:Surface-Active Agents; C416807:polyaniline; C001114:dodecylbenzenesulfonic acid