Electrochemical polymerization of poly(o-anisidine) thin films: effect of synthesis temperature studied by cyclic voltammetry

✍ Scribed by Patil, Sharmila; Mahajan, J. R.; More, M. A.; Patil, P. P.; Gosavi, S. W.; Gangal, S. A.

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 374 KB
• Volume: 46
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199806)46:2<99::aid-pi939>3.0.co;2-j

✦ Synopsis

The e †ect of temperature on the electrochemical synthesis of poly(oanisidine) (POA) thin Ðlms has been investigated. The POA Ðlms were synthesized electrochemically under cyclic voltammetric conditions in aqueous solutions of at various temperatures between [6¡C and 40¡C. These Ðlms H 2 SO 4 were characterized by cyclic voltammetry (CV), UVÈvisible spectroscopy and scanning electron microscopy (SEM). It has been found that the rate of polymer formation depends on the synthesis temperature and is highest at 15¡C. The optical absorption spectra indicate a major peak at about 800 nm and a shoulder at about 440 nm independent of the synthesis temperature. The peak at about 800 nm corresponds to the presence of the emeraldine salt phase of POA, while the latter may be attributed to the formation of radical cations. The absorbance and width of the peak at about 800 nm is observed to increase at low synthesis temperatures. The POA Ðlm synthesized at 15¡C shows predominant formation of the emeraldine salt phase of POA. The surface morphology as revealed by SEM, is observed to depend on the synthesis temperature, and is caused by di †erent rates of polymer formation at di †erent temperatures.

1998 SCI.