Innovative advancements by Carnegie Mellon University researchers are set to address a significant yet often overlooked issue: indoor air quality. Common items found in homes, from cleaning agents to cosmetics, can release formaldehyde, a chemical linked to health risks. A new technology promises to enhance the durability and efficiency of air quality sensors, potentially transforming how indoor air pollutants are detected.
“Indoor air quality is often overlooked,” stated Albert Presto, director of the Center for Atmospheric Particle Studies at CMU, and co-author of a recently published paper on this technology. “We want to better educate people on indoor pollutants, so that they can make informed decisions. Only then can we improve indoor air quality and eliminate the inherent health risks.”
To tackle the challenge of formaldehyde emissions, researchers have developed a sensor that incorporates a unique polymer coating, significantly extending its operational life. This coating increases the sensor’s half-life by over 200% and allows it to regenerate when it begins to degrade.
How the Sensor Operates
The sensor capitalizes on the properties of MXene compounds, known for their energy storage and gas detection capabilities. However, these compounds are prone to oxidation when exposed to air and humidity. The research team, led by Reeja Jayan, a mechanical engineering professor, addressed this by applying a polymer coating to the MXene. This nano-coating process is akin to the way condensation forms on a cold glass.
Originally, MXene sensors functioned effectively for just over two months. With the polymer enhancement, their lifespan extended beyond five months. Ph.D. candidate Shwetha Sunil Kumar noted the coating’s added benefit: it improved the sensor’s ability to detect lower levels of formaldehyde.
“We found that our polymer layer allowed the sensor to detect lower levels of formaldehyde in the air,” Kumar explained.
Moreover, researchers discovered that introducing humidity to the sensor near the end of its life restored approximately 90% of its sensing capacity. Jayan is optimistic about the potential applications of these materials in other devices to boost longevity and performance. She is currently exploring similar technology aimed at enhancing battery life and safety.
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