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Rechargeable battery based on substituted LS polyanilines

M.K. Ram, M. Sartore, S, Paddeu, and C. Nicolini*

Polo Nazionale Bioelettronica, Marciana, (LI), Italy
El.B.A. Foundation, Rome (Italy) and
Institute of Biophysics, University of Genoa (Italy)

This is an abstract for a poster to be presented at the
Fifth Foresight Conference on Molecular Nanotechnology.
The full paper is available here.

 

Conducting polyaniline has been recently postulated as a potential candidate for numerous electronic applications such as electrochromic displays, rechargeable batteries, microelectronic devices, biosensors, protection coating and chemical sensors. The effect of substituent groups (-CH3, -OCH3 or -OC2H5 etc.) in monomer or polymeric chain of polyanilines appears to enhance such potentiality, by displaying at the same time a significant increase in electronic localization with simultaneous decrease in conductivity and an excellent solubility in a number of organic solvents [1]. The solubility of polyanilines enables to assemble such conducting polymers into ultrathin films at the molecular level with high degree of order. Namely, very thin films of polyaniline (PANI) [2], poly(o-anisidine) (POAS) [3,4] and poly(ethoxy aniline) (PEOA) [5] have been engineered by either Langmuir-Blodgett (LB) or Langmuir Shaefer (LS) techniques. It can be seen that the effect of substituent plays a prominent role for the fabrication of such ultra thin films.

Extensive analytical studies have been carried out on the kinetics of Langmuir film formation; LS films of substituted polyanilines. Langmuir isotherm of the PANI, poly(o-toluidine) (POT), POAS, and PEOA were investigated at aqueous subphase of pH 1, where the doping during the monolayer formation appeared an essential step for the high quality of Langmuir film. The area per unit molecule was shown to increase with the increase in the substituent groups. The deposited LS films of such polyanilines were characterized by UV-visible, X-ray diffractometry, Brewster microscopy, ellipsometry and cyclic voltammetry, respecctively. While the conductivity of polyaniline films was shown to be decreasing as a function of substituents in aniline monomer, the surface investigated by scanning tunneling microscopy (STM) showed an increase of the amorphosity as a function of substituents in polyanilines LS films. In this communication, the main objective is to report on the link existing between the above findings and the charging/discharging properties of substituted polyanilines LS films toward the optimal manufacturing of a rechargeable battery based on this class of conducting polymer.

References
[1] E.T.Kang, et al. Synth. Met. 48, 231 (1992).
[2] M.K.Ram, et al. J. Phys. Chem. 97, 11580 (1993).
[3] M.K.Ram, et al. Langmuir, in press (1997)
[4] S. Paddeu, et al. J. Phys. Chem., in press (1997)
[5] D. Goncalves, et al. Thin Solid Films. 243, 544 (1994)


*Corresponding Address:
Claudio Nicolini, Fondazione EL.B.A., Via Medaglie d'Oro 305 - 00136 Rome, Italy, ph: +39 6 35410728, fax: +39 6 35451637, email: info@fondazione-elba.org



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