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 Additive manufacturing: 3D Printing Stretchable Electronics?

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Date posted: 12/01/2017

Electronic components that can be elongated or twisted -- known as "stretchable" electronics -- could soon be used to power electronic gadgets, the onboard systems of vehicles, medical devices and other products. And a 3-D printing-like approach to manufacturing may help make stretchable electronics more prevalent, say researchers at Missouri University of Science and Technology.

Writing in the January 2017 edition of the journal Micromachines, Missouri S&T researchers assess the current state of the emerging field of stretchable electronics, focusing on a type of conductor that can be built on or set into the surface of a polymer known as elastomer.

These conductors could one day replace the rigid, brittle circuit board that powers many of today's electronic devices. They could be used, for example, as wearable sensors that adhere to the skin to monitor heart rate or brain activity, as sensors in clothing or as thin solar panels that could be plastered onto curved surfaces.

Key to the future of stretchable electronics is the surface, or substrate. Elastomer, as its name implies, is a flexible material with high elasticity, which means that it can be bent, stretched, buckled and twisted repeatedly with little impact on its performance.

One challenge facing this class of stretchable electronics involves "overcoming mismatches" between the flexible elastomer base and more brittle electronic conductors, the researchers explain in their paper, "Materials, Mechanics, and Patterning Techniques for Elastomer-Based Stretchable Conductors."

"Unique designs and stretching mechanics have been proposed to harmonize the mismatches and integrate materials with widely different properties as one unique system," writes the research team, which is led by Dr. Heng Pan, assistant professor of mechanical and aerospace engineering at Missouri S&T.

A relatively new manufacturing technique known as additive manufacturing may help resolve this issue, Pan says.

Additive manufacturing is a process that allows manufacturers to create three-dimensional objects, layer by layer -- much like 3-D printing, but with metals, ceramics or other materials. In their paper, the researchers suggest that additive manufacturing could be used to "print" very thin layers of highly conductive materials onto an elastomer surface.

"With the development of additive manufacturing, direct writing techniques are showing up as an alternative to the traditional subtractive patterning methods," the S&T researchers say.

See the full Story via external site: www.sciencedaily.com

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