Photoinduced Absorption and Erasable Optical Information Storage in Polyanilines
Technical rept. 6 Jun 1990-31 Oct 1991
PENNSYLVANIA UNIV PHILADELPHIA DEPT OF CHEMISTRY
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Photoinduced absorption spectroscopy has been used to study a variety of forms of polyaniline. Experiments on emeraldine base and leucoemeraldine base have led to a picture of the photoproduction and decay of massive, long-lived defect states that can be described in terms of conformational changes involving rotations of the C6H4 rings. Photoexcitation spectra of other polyanilines, such as pernigraniline base and polyo-toluidine, exhibit similar features including relatively weak photoinduced infrared vibrations and a relatively strong photoinduced absorption peak near 1.4-1.5 eV. In several of these materials, the photoinduced changes are very long-lived, leading to an investigation of the polyanilines as media for erasable optical information storage.
- Information Science