Gelatin- and DNA-based ionic conducting membranes for electrochromic devices

A. Pawlicka; A. Firmino; D. Vieira; F. Sentanin; J. G. Grote; F. Kajzar

doi:10.1117/12.835913

24 September 2009 Gelatin- and DNA-based ionic conducting membranes for electrochromic devices

A. Pawlicka, A. Firmino, D. Vieira, F. Sentanin, J. G. Grote, F. Kajzar

Proceedings Volume 7487, Optical Materials in Defence Systems Technology VI; 74870J (2009) https://doi.org/10.1117/12.835913
Event: SPIE Security + Defence, 2009, Berlin, Germany

Abstract

Gelatin and DNA are abundant natural products with very good biodegradation properties and can be used to obtain acetic acid or LiClO₄-based gel polymer electrolytes (GPEs) with high ionic conductivity and good stability. This article presents the results of the ionic conductivity measurements of GPEs membranes based on crosslinked and plasticized gelatin and on plasticized DNA as well as on inserted/extracted charge density of electrochemical devices (ECDs) obtained with these samples. The membranes were analyzed by impedance spectroscopy, UV-Vis spectroscopy and the ECDs by charge density measurements, respectively. At room temperature the measured ionic conductivity of the membranes is in the range of 10^-4-10^-5 S/cm. It obeys predominantly an Arrhenius relationship in function of temperature. The ECD with red gelatin changed the color from red to deep red and the ECD with DNA-based electrolyte changes from transparent to blue. The inserted charge density values of these ECDs were of -3.0 mC/cm² for the device with red gelatin and -6.6 mC/cm² for the ECD with DNA-based electrolyte. The reverse potential application promoted a charge extraction and, as consequence, bleaching of the devices. Good ionic conductivity results combined with transparency and good adhesion to the electrodes and promising preliminary results of small ECDs have shown that gelatin and DNA-based GPEs are very promising materials to be used as gel polymer electrolytes in electrochromic devices.

Citation Download Citation

A. Pawlicka, A. Firmino, D. Vieira, F. Sentanin, J. G. Grote, and F. Kajzar "Gelatin- and DNA-based ionic conducting membranes for electrochromic devices", Proc. SPIE 7487, Optical Materials in Defence Systems Technology VI, 74870J (24 September 2009); https://doi.org/10.1117/12.835913

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