A next-generation smart textile produced with the same machines used to make the clothing we wear every day. Photo: Sanghyo Lee.
A next-generation smart textile produced with the same machines used to make the clothing we wear every day. Photo: Sanghyo Lee.

Researchers have developed next-generation smart textiles – incorporating LEDs, sensors, energy harvesting and storage – that can be produced inexpensively, in any shape or size, using the same machines used to make the clothing we wear every day.

The international team, led by researchers at the University of Cambridge in the UK, had previously demonstrated that woven displays can be made at large sizes, but these earlier examples were made using specialized manual laboratory equipment. Other smart textiles can be manufactured in specialized microelectronic fabrication facilities, but these are highly expensive and produce large volumes of waste.

Now, however, the team has found that flexible displays and smart fabrics can be made much more cheaply, and more sustainably, by weaving electronic, optoelectronic, sensing and energy fiber components on the same industrial looms used to make conventional textiles. Their results, reported in a paper in Science Advances, demonstrate how smart textiles could be an alternative to larger electronics in industrial sectors like automotive, electronics, fashion and construction.

Despite recent progress in the development of smart textiles, their functionality, dimensions and shapes have been limited by current manufacturing processes.

“We could make these textiles in specialized microelectronics facilities, but these require billions of pounds of investment,” said Sanghyo Lee from Cambridge’s Department of Engineering, the paper’s first author. “In addition, manufacturing smart textiles in this way is highly limited, since everything has to be made on the same rigid wafers used to make integrated circuits, so the maximum size we can get is about 30cm in diameter.”

“Smart textiles have also been limited by their lack of practicality,” added Luigi Occhipinti, also from Cambridge’s Department of Engineering, who co-led the research. “You think of the sort of bending, stretching and folding that normal fabrics have to withstand, and it’s been a challenge to incorporate that same durability into smart textiles.”

Last year, some of the same researchers showed that coating the fibers used in smart textiles with materials that can withstand stretching could make them compatible with conventional weaving processes. Using this technique, they produced a 46-inch woven demonstrator display.

The researchers have now shown that smart textiles can be made using automated processes, with no limits on their size or shape. Multiple types of fiber devices, including energy-storage devices, light-emitting diodes and transistors, were fabricated, encapsulated and mixed with conventional fibers, either synthetic or natural, to build smart textiles by automated weaving. The fiber devices were interconnected by an automated laser-welding method with electrically conductive adhesive.

The processes were all optimized to minimize damage to the electronic components, which in turn made the resulting smart textiles durable enough to withstand the stretching of an industrial weaving machine. The encapsulation method was designed to consider the functionality of the fiber devices, and the mechanical force and thermal energy were investigated systematically to achieve the automated weaving and laser-based interconnection, respectively.

The research team, working in partnership with textile manufacturers, were able to produce test patches of smart textiles of roughly 50x50cm, although this can be scaled up to larger dimensions and produced in large volumes.

“These companies have well-established manufacturing lines with high-throughput fiber extruders and large weaving machines that can weave a meter-square of textiles automatically,” said Lee. “So when we introduce the smart fibers to the process, the result is basically an electronic system that is manufactured exactly the same way other textiles are manufactured.”

The researchers say it should be possible for large, flexible displays and monitors to be made on industrial looms, rather than in specialized electronics manufacturing facilities, which would make them far cheaper to produce. Further optimization of the process is needed, however.

“The flexibility of these textiles is absolutely amazing,” said Occhipinti. “Not just in terms of their mechanical flexibility, but the flexibility of the approach, and to deploy sustainable and eco-friendly electronics manufacturing platforms that contribute to the reduction of carbon emissions and enable real applications of smart textiles in buildings, car interiors and clothing. Our approach is quite unique in that way.”

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