AI Article Synopsis
- Water-soluble dipyridinium thiazolo[5,4-]thiazole (TTz) compounds are added to affordable poly(vinyl alcohol) (PVA)/borax films, resulting in fast color-changing effects and oxygen sensing capabilities.
- The films transition from clear/yellow to purple and blue when illuminated, with the speed and contrast of these changes influenced by the polymer matrix and TTz concentration.
- These films not only exhibit color changes but also mechanical contractions under light, making them suitable for applications like smart windows, displays, and oxygen-sensing packaging.
Article Abstract
Water-soluble dipyridinium thiazolo[5,4-]thiazole (TTz) compounds are incorporated into inexpensive poly(vinyl alcohol) (PVA)/borax films and exhibit fast (<1 s), high-contrast photochromism, photofluorochromism, and oxygen sensing. Under illumination, the films change from clear/yellow TTz to purple TTz and then blue TTz. The contrast and speed of the photochromism are dependent on the polymer matrix redox properties and the concentration of TTz. The photoreduced films exhibit strong, near-infrared light (1000-1500 nm) absorbances in addition to visible color changes. Spectroscopic ellipsometry was used to establish the complex dielectric function for the TTz and TTz states. Incorporating non-photochromic dyes yields yellow-to-green and pink-to-purple photochromism. Additionally, when illuminated, reversible photoactuation occurs, causing mechanical contraction in the TTz-embedded films. The blue film returns to its colorless state via exposure to O, making the films able to sense oxygen and leak direction for smart packaging. These films show potential for use in self-tinting smart windows, eyeglasses, displays, erasable memory devices, fiber optic communication, and oxygen sensing.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11129348 | PMC |
| http://dx.doi.org/10.1021/acsaom.4c00014 | DOI Listing |
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