Electrochemical behavior simulating the synaptic plasticity in the dopant exchange process of p-toluenesulfonate-doped polypyrrole

✍ Scribed by M. Iseki; K. Saito; M. Ikematsu; Y. Sugiyama; K. Kuhara; A. Mizukami

• Book ID: 103968748
• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 662 KB
• Volume: 1
• Category: Article
• ISSN: 0928-4931
• DOI: 10.1016/0928-4931(94)90062-0

✦ Synopsis

The unusual electrochemical behavior of p-toluenesulfonate-doped polypyrrole (PPy/TsO-) was studied in terms of its application to the device that can reversibly change the amplitude of the output signal according to the frequency of the input signal. The device simulates the synaptic plasticity (the efficiency of the signal transmission changes as a function of the frequency of the stimulus signal). Therefore we call this an electrically plastic device. PPy/TsO-films were prepared by electropolymerization of pyrrole in aqueous solutions. PPy/TsO-is electrochemically inactivated in aqueous solutions containing alkaline-earth metal ions or tetraalkylammonium ions. The inactivated PPy/TsO-is gradually activated however by potential sweeping or spontaneous anion exchange during immersion. Using both gradual activation by potential sweeping and preferential dopant exchange during immersion in a mixed electrolyte solution, reversible electrically plastic behavior was successfully developed. The possibility of developing a biomimetic device that uses PPy/TsO-as an artificial conducting polymer in an electrochemical system is discussed.