High frequency mass transfer responses with polyaniline modified electrodes by using new ac-electrogravimetry device |
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Authors: | R. Torres A. Arnau S. Joiret H. Perrot T.K.L. To X. Wang |
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Affiliation: | a Escuela de Ingeniería de Antioquia Calle 25 Sur No. 42-73, Envigado, Colombia b Departamento Ingeniería Electrónica, ETSI de Telecomunicación, Universidad Politécnica de Valencia, Camino de Vera s/n, C.P. 46022, Valencia, Spain c CNRS, UPR 15 du CNRS, Laboratoire Interfaces et Systèmes Electrochimiques-LISE, 4, place Jussieu, 75005 Paris, France d UPMC, Université Pierre et Marie Curie-Paris 6, Laboratoire Interfaces et Systèmes Electrochimiques-LISE, 4, place Jussieu, 75005 Paris, France |
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Abstract: | For many years, polyaniline films have appeared to be one of the most studied conducting polymers. At the same time, ac-electrogravimetry has been used as a powerful technique for different polymer films but in general for slow perturbation rates. Two reasons for that: on the one hand, high frequency mass transfer responses are not expected and on the other hand, the electronic interfaces dedicated for ac-electrogravimetry are not prepared to follow, without distortion, high rate frequency shifts, faster than a few hertz. This paper shows that high ionic transfer responses can be detected by using a new ac-electrogravimetry concept. The experiments conducted with PANI tried to verify whether high frequency responses in conducting polymers are possible or not. The main interest of the new device is to reach the high frequency values directly and to demonstrate an ionic transfer contribution at 1 kHz which was not predicted with old systems. |
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Keywords: | Polyaniline Ionic transfer ac-Electrogravimetry Frequency/voltage converter |
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