Artificial 'skin' gives robotic hand a sense of touch

September 13, 2017 by Jeannie Kever
Researchers from the University of Houston have reported a breakthrough in stretchable electronics that can serve as an artificial skin, allowing a robotic hand to sense the difference between hot and cold. Credit: University of Houston

A team of researchers from the University of Houston has reported a breakthrough in stretchable electronics that can serve as an artificial skin, allowing a robotic hand to sense the difference between hot and cold, while also offering advantages for a wide range of biomedical devices.

The work, reported in the journal Science Advances, describes a new mechanism for producing , a process that relies upon readily available materials and could be scaled up for commercial production.

Cunjiang Yu, Bill D. Cook Assistant Professor of mechanical engineering and lead author for the paper, said the work is the first to create a in a rubber composite format, designed to allow the electronic components to retain functionality even after the material is stretched by 50 percent.

The work is the first semiconductor in rubber composite format that enables stretchability without any special mechanical structure, Yu said.

He noted that traditional semiconductors are brittle and using them in otherwise stretchable has required a complicated system of mechanical accommodations. That's both more complex and less stable than the new discovery, as well as more expensive, he said.

"Our strategy has advantages for simple fabrication, scalable manufacturing, high-density integration, large strain tolerance and low cost," he said.

Cunjiang Yu, Bill D. Cook Assistant Professor of mechanical engineering, and post-doctoral researcher Hae-Jin Kim have reported a breakthrough in stretchable electronics. Credit: University of Houston

Yu and the rest of the team - co-authors include first author Hae-Jin Kim, Kyoseung Sim and Anish Thukral, all with the UH Cullen College of Engineering - created the electronic and used it to demonstrate that a could sense the temperature of hot and iced water in a cup. The skin also was able to interpret computer signals sent to the hand and reproduce the signals as American Sign Language.

"The robotic skin can translate the gesture to readable letters that a person like me can understand and read," Yu said.

The is just one application. Researchers said the discovery of a material that is soft, bendable, stretchable and twistable will impact future development in soft wearable electronics, including health monitors, medical implants and human-machine interfaces.

The stretchable composite semiconductor was prepared by using a silicon-based polymer known as polydimethylsiloxane, or PDMS, and tiny nanowires to create a solution that hardened into a material which used the nanowires to transport electric current.

"We foresee that this strategy of enabling elastomeric semiconductors by percolating semiconductor nanofibrils into a rubber will advance the development of stretchable semiconductors, and ... will move forward the advancement of stretchable electronics for a wide range of applications, such as artificial skins, biomedical implants and surgical gloves," they wrote.

Explore further: Nanoengineers develop basis for electronics that stretch at the molecular level

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