Designing materials that change color under applied stimuli is no easy task, not to mention the long list of required properties for rewritable chromic systems (easy printing and erasing, printing high quality images, cyclability, multicolored, etc…). There have been many methods developed to address the problem, focusing on a variety of stimuli. But often is the case that, chromic systems rely on complex synthetic synthesis to achieve chromic responses or after applying a stimulus, the systems are either irreversibly damaged or immediately revert back to the original state, greatly limiting the potential applications of the chromic systems. A promising approach to develop a system that solves the many problems with chromic systems, is to decouple the chromic activation with the reverse recoloration and to utilize a stimulus with easily controlled parameters. In this talk I will discuss a series of scalable, simple and low-cost photochromic films consisting of synthesized semiconductor nanoparticles coupled with redox dyes encapsulated in a polymer matrix. The transition between colored and colorless state can be achieved through the direct application of external stimuli to the film, while the reverse state can be controlled through manipulation of the polymer/semiconductor nanocomposite. Resulting in the creation of a reversible, self-contained, and highly precise photochromic system capable of printing complex images. Through manipulation of the kinetics of the redox transition, various color changing systems are created that show excellent controlled reversibility to applied stimuli and multicolor functionality. These systems could find wide applications as rewritable media, sensors, encryption, etc.<br/>

Rewritable photochromic systems based on a polymer semiconductor nanocomposite

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.