Study authors Nataliia Vereshchuk, a postdoctoral fellow, at left, and Aileen Eagleton, Guarini ’23, examine the metal-organic on fabric. (Image from video by Vadim Zharkov for Mirica Group)

A durable, copper-based coating developed by a team at Dartmouth University can be integrated into fabric to create responsive, reusable materials such as protective equipment, environmental sensors, and smart filters.

The coating responds to the presence of toxic gases by converting them into less toxic substances that become trapped in the fabric, the research, published in the Journal of the American Chemical Society, shows.

The findings hinge on a conductive metal-organic framework developed in the lab of corresponding author Katherine Mirica, an Associate Professor of Chemistry.

First reported in 2017, the framework was a simple coating that could be layered onto cotton and polyester to create smart fabrics — Self-Organized Framework on Textiles (SOFT). The work demonstrated that SOFT smart fabrics could detect and capture toxic substances in the surrounding environment.

The team found that, instead of the coating reported in 2017, it could precisely embed the framework into fabrics using a copper precursor that allows them to create specific patterns and more effectively fill in the tiny gaps and holes between threads. The research showed that the framework technology effectively converted the toxin nitric oxide into nitrite and nitrate, and transformed the poisonous, flammable gas hydrogen sulfide into copper sulfide. It also showed the framework’s ability to capture and convert toxic materials withstood wear and tear, as well as standard washing.

“This new method of deposition means that the electronic textiles could potentially interface with a broader range of systems because they’re so robust,” Mirica said. “This technological advance paves the way for other applications of the framework’s combined filtration and sensing abilities that could be valuable in biomedical settings and environmental remediation.”

The technique also could eventually be a low-cost alternative to technologies that are cost-prohibitive and limited in where they can be deployed by needing an energy source, or — such as catalytic converters in automobiles — rare metals, Mirica added.

“Here we’re relying on an Earth-abundant matter to detoxify toxic chemicals, and we’re doing it without any input of outside energy, so we don’t need high temperature or electric current to achieve that function,” Mirica said.

Co-first author Michael Ko, Guarini ’20, observed the new process in 2018 as he attempted to deposit the metal-organic framework onto thin-film copper-based electrodes. But the copper electrodes would be replaced by the framework.

“He wanted it on top of the electrodes, not to replace them,” Mirica said. “It took us four years to figure out what was happening and how it was beneficial. It’s a very straightforward process, but the chemistry behind it is not and it took us some time and additional involvement of students and collaborators to understand that.”

The team discovered that the metal-organic framework “grows” over copper — replacing it with a material with the ability to filter and convert toxic gases. Ko and co-author Lukasz Mendecki investigated methods for applying the framework material to fabric in specific designs and patterns.

Co-first author Aileen Eagleton finalized the technique by optimizing the process for imprinting the metal-organic framework onto fabric, as well as identifying how its structure and properties are influenced by chemical exposure and reaction conditions. Future work will focus on developing new multifunctional framework materials and scaling up the process of embedding the metal-organic coatings into fabric, Mirica added.

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