Robotic skin can 'feel' hot and cold temperatures
19 September 2017
Stretchable electronics can now serve as an artificial skin: this robotic hand can sense the difference between hot and cold, while also offering advantages for a wide range of biomedical devices.
The research, from the University of Houston, describes a new mechanism for producing stretchable electronics, 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 semiconductor 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 also noted that traditional semiconductors are brittle, and using them in otherwise stretchable materials has previously required a complicated system of mechanical accommodations. This is both more complex and less stable than the new discovery, as well as more expensive, Yu said.
"Our strategy has advantages for simple fabrication, scalable manufacturing, high-density integration, large strain tolerance and low cost."
Yu and his team created the electronic skin and used it to demonstrate that a robotic hand 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 can understand and read," Yu said.
The artificial skin is just one application, moreover. 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," the researchers wrote.
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