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Achieving Smart Photochromics Using Water-Processable, High-Contrast, Oxygen-Sensing, and Photoactuating

Tyler J Adams¹, Naz F Tumpa¹, Maithili Acharya¹

¹Department of Chemistry, University of North Carolina at Charlotte, Charlotte, North Carolina 28223, United States.

ACS Applied Optical Materials

|May 29, 2024

Summary

This summary is machine-generated.

New poly(vinyl alcohol)/borax films with dipyridinium thiazolo[5,4-d]thiazole (TTz) compounds show rapid, high-contrast photochromism and oxygen sensing capabilities for smart materials.

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Area of Science:

Materials Science
Polymer Chemistry
Photochemistry

Background:

Developing advanced materials with tunable optical and sensing properties is crucial for next-generation technologies.
Photochromic materials offer dynamic color-changing capabilities upon light exposure.
Integrating sensing functionalities into photochromic systems enhances their application potential.

Purpose of the Study:

To incorporate water-soluble dipyridinium thiazolo[5,4-d]thiazole (TTz) compounds into poly(vinyl alcohol)/borax films.
To investigate the photochromic, photofluorochromic, and oxygen sensing properties of these composite films.
To explore the potential applications of these functional films in smart devices.

Main Methods:

Fabrication of poly(vinyl alcohol)/borax films embedded with dipyridinium thiazolo[5,4-d]thiazole (TTz) compounds.
Characterization of photochromic and photofluorochromic behavior under illumination.
Investigation of oxygen sensing capabilities and photoactuation effects.
Spectroscopic ellipsometry to determine dielectric functions of different TTz states.

Main Results:

The TTz-containing films exhibited fast (<1 s), high-contrast photochromism, changing from clear/yellow (TTz²⁺) to purple (TTz^•+) and blue (TTz⁰).
Photoreduced films showed strong near-infrared absorbance (1000-1500 nm) alongside visible color changes.
Reversible photoactuation (mechanical contraction) and oxygen-dependent color recovery were observed.
Incorporating other dyes led to yellow-to-green and pink-to-purple photochromism.

Conclusions:

The developed PVA/borax/TTz films offer rapid, high-contrast photochromism and effective oxygen sensing.
The tunable optical properties and photoactuation suggest applications in smart windows, displays, and erasable memory.
The oxygen sensing capability is particularly promising for smart packaging and leak detection.