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In Situ Polymerized Polyaniline Films

2002; Elsevier BV; Volume: 248; Issue: 2 Linguagem: Inglês

10.1006/jcis.2001.8197

1095-7103

Andrea Riede, Martin Helmstedt, Irina Sapurina, Jaroslav Stejskal,

Electrochemical sensors and biosensors

Polyaniline films were grown on glass supports during dispersion polymerizations of aniline using poly(N-vinylpyrrolidone) and hydroxypropylcellulose as stabilizers. The initiation of polyaniline chains is proposed to be heterogeneously catalyzed by the surfaces immersed in the reaction mixture. Film formations in dispersion and precipitation polymerizations are compared. Surfometry and optical absorption were used to assess the submicrometer film thickness, and FTIR spectroscopy was used to analyze the chemical structure of films and prove the absence of stabilizer. The film thickness was proportional to the dimensions of simultaneously produced colloidal polyaniline particles. The conductivity of films increased with increasing film thickness.