By Samson A. Jenekhe and Douglas J. Kiserow (Eds.)
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Additional info for Chromogenic Phenomena in Polymers. Tunable Optical Properties
The prospects for these kinds of applications have generated a high demand for new materials with improved electrochromic response, which is reflected in the increasing number of publications on the topic in recent years (4). g. W 0 (5), V 0 (6, 7) and T i 0 (8)) and organic systems based on viologen, anthroquinone, and phenazine derivatives (3, P, 10). The construction of electrochromic devices based on inorganic materials has attained significant results. ; ACS Symposium Series; American Chemical Society: Washington, DC, 2004.
Oxidative (positive) and reductive (negative) peak currents for (a) electrostatic and (b) Η-bond PANI LBL films linearly increase with scan rate. Another transport phenomenon occurring within the films during C V switching is the movement of the redox front - the transfer of electrons at the ITO/PANI interface and within the film interior. A qualitative characterization of this phenomemon may be made by examining the hysteresis between C V oxidation and reduction peaks. For most systems the hysteresis between these peaks grows with increasing scan rate, indicating a non-Nernstian condition at the reactive front caused by charge transfer resistance within the L B L film structure.
These characteristics make polymer materials excellent candidates for designing tunable optical materials for electrochromic device applications. To develop electrochromic polymers, it is necessary to obtain polymers that are reasonably conducting with low band gap energies so that the change of energy produced in passing from one redox state to another occurs with the band gaps in the range of energies in the visible region of the electromagnetic spectrum. Low band gap polymers can be obtained by maximizing the πextended-conjugation within the conjugated polymer backbone (//); for example, ladder-type structures with coplanar conformations between the polymer's consecutive repeat units (12).
Chromogenic Phenomena in Polymers. Tunable Optical Properties by Samson A. Jenekhe and Douglas J. Kiserow (Eds.)