Researchers have developed a microelectronic fiber that is capable of analyzing electrolytes and metabolites in sweat.
Recent advancements in the multi-material fiber drawing process have ushered in a new era of multifunctional, fiber-based smart fabrics.
Smart fabrics allow for the seamless integration of electronics, optics, biosensors, and mechanics into a thin strand of fiber that is intrinsically flexible and as thin as a human hair. These fabrics can then be used to monitor vital physiological signals related to our mental and physical health status.
Yuanyuan Guo, PhD, assistant professor at Tohoku University’s Frontier Research Institute for Interdisciplinary Sciences, led a team of researchers to develop the microelectronic fiber with microscopic parameters capable of analyzing electrolytes and metabolites in sweat. Its micrometer scale allows it to be woven into clothes for healthcare applications.
To produce the fiber, the group leveraged the versatile thermal drawing process, where heat is applied to draw out micro-structured fiber from its macroscopic preform. The team also patterned on two sensing electrodes for sodium and uric acid on the longitudinal surface of the fiber.
“Our breakthrough is the first successful attempt at using thermally drawn fiber in wearable bioelectronics for monitoring biochemical signatures,” says Guo.
Although mainstream photolithography and printing technology have enabled wearable electronics, doing so often entails attaching fairly rigid electronic patches to existing fabrics or directly on the skin, leading to only a small area of the body being covered.
“Since most developments so far could not be considered clothes, we devoted our effort to transforming fiber, to make truly wearable smart fabric,” says Guo.
The fiber could lead to fiber-based “smart” clothes that provide greater versatility in functions, larger sensing areas, and greater comfort.
Graduate student Jingxuan Wu was the leading author of the research work, and it was published in Analytical and Bioanalytical Chemistry.
Featured image: The microelectronic fibers fabricated by the thermal drawing process and its fabrics for sweat sensing. Photo: Jingxuan Wu et al.