Polymer films let neat threads hold their charge

A major factor holding back development of wearable biosensors for health monitoring is the lack of a lightweight, long-lasting power supply. Now, scientists at the University of Massachusetts (UMass) Amherst, led by materials chemist Trisha Andrew, report a new method for making a charge-storing system that is easily integrated into clothing for ‘embroidering a charge-storing pattern onto any garment’.

"Batteries or other kinds of charge storage are still the limiting components for most portable, wearable, ingestible or flexible technologies," explains Andrew. "The devices tend to be some combination of too large, too heavy and not flexible."

The new method employs a micro-supercapacitor and combines vapor-coated conductive threads with a polymer film, plus a special sewing technique to create a flexible mesh of aligned electrodes on a textile backing. The resulting solid-state device has a high ability to store charge for its size, as well as other characteristics that allow it to power wearable biosensors.

Andrew adds that while researchers have miniaturized many different electronic circuit components, until now the same could not be said for charge-storing devices. "With this paper, we show that we can literally embroider a charge-storing pattern onto any garment using the vapor-coated threads that our lab makes," she says. "This opens the door for simply sewing circuits on self-powered smart garments." The scientists report their work in a paper in ACS Applied Materials & Interfaces.

Andrew and postdoctoral researcher and first author Lushuai Zhang, plus chemical engineering graduate student Wesley Viola, point out that supercapacitors are ideal candidates for wearable charge storage circuits, because they have inherently higher power densities compared to batteries.

But "incorporating electrochemically active materials with high electrical conductivities and rapid ion transport into textiles is challenging," they add. In the paper, Andrew and her colleagues show that their vapor coating process can create porous conducting polymer films on densely-twisted yarns. These polymer films can be easily swelled with electrolyte ions and maintain high charge storage capacity per unit length, as compared to prior work with dyed or extruded fibers.

Andrew, who directs the Wearable Electronics Lab at UMass Amherst, notes that textile scientists have tended not to use vapor deposition because of technical difficulties and high costs. More recently, however, research has shown that the technology can be scaled up and remain cost-effective.

She and her team are currently working with others at the UMass Amherst Institute for Applied Life Sciences' Personalized Health Monitoring Center on incorporating the new embroidered charge-storage arrays with e-textile sensors and low-power microprocessors. Their aim is to build smart garments that can monitor a person's gait and joint movements throughout a normal day.

This story is adapted from material from the University of Massachusetts Amherst, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier. Link to original source.