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Age of Terminators comes a step closer: Scientists invent ’e-skin’, may give robots sense of touch
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Age of Terminators comes a step closer: Scientists invent ’e-skin’, may give robots sense of touch


Scientists have developed a pressure-sensitive electronic skin which could one day be used to restore touch to patients who have prosthetic limbs.
The material, dubbed e-skin, is made from semiconductor nanowires made from silicon.

A section of the completed e-skin with nanowire circuits. Each dark square represents a single pixel.

More sinister, however, is the prospect of the invention lending robots the ability to adapt the amount of roce needed to hold and manipulate objects.

The nanowires are incredibly thin structures, more than 10,000 times thinner than a single human hair.
They open up the possibility for a robot to be able to hold an egg by judging how delicate it is.

But in true Terminator style, robots would for once know their own strength - which the hero of those movies, John Connor, would presumably see as bad news.

An artist’s illustration of an artificial e-skin covering a hand. The finished product would give incredible touch and sensitivity.

The researchers’ stated long-term goal is to use e-skin to restore the sense of touch to patients with artificial limbs.
At the same time scientists from Stanford University have developed an electronic sensor that it is so sensitive that can it can feel a touch as light as a butterfly.

Manufactured in large sheets, the sensors could be used in artificial electronic skin for prosthetic limbs, robots, touch-screen displays, automobile safety and a range of medical applications.

That degree of sensitivity could make the sensors useful in a broad range of medical applications, including robotic surgery, according to the research team.
Bandages equipped with the sensors could aid in healing of wounds and incisions. Doctors could use data from the sensors to be sure the bandages were not too tight.

Car safety could also be improved with sensitive, ’intelligent’ material applied to the steering wheel.
’If a driver is tired, or drunk, or falls asleep at the wheel, their hands might loosen or fall off the wheel,’ said Benjamin Tee, graduate student in electrical engineering and a coauthor.
’If there are pressure sensors that can sense that no hands are holding the steering wheel, the car could be equipped with some automatic safety device that could sound an alarm or kick in to slow the car down.

’This could be simpler and cost less than other methods of detecting driver fatigue.’

At the University of California, Berkeley , research scientists printed nanowires onto an 18-by-19 pixel square matrix measuring 7 centimetres on each side. Each pixel contained a transistor made up of hundreds of semiconductor nanowires.
Nanowire transistors were then integrated with a pressure sensitive rubber so that it would be able to detect touch.

The matrix required less than 5 volts of power to operate and maintained its robustness after being bent more than 2,000 times in tests.
In tests, the e-skin was able to detect pressure from 0 to 15 kilopascals, a range comparable to the force used for such daily activities as typing on a keyboard or holding an object.

‘The idea is to have a material that functions like the human skin, which means incorporating the ability to feel and touch objects,’ said Ali Javey, head of the UC Berkeley research team developing the artificial skin.

The artificial skin is described in a September 12th paper in the advanced online publication of the journal Nature Materials. It is the first such material made out of inorganic single crystalline semiconductors.
‘Humans generally know how to hold a fragile egg without breaking it,’ said Javey.

‘If we ever wanted a robot that could unload the dishes, for instance, we’d want to make sure it doesn’t break the wine glasses in the process. But we’d also want the robot to be able to grip a stock pot without dropping it.’


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Top Image: In Star Wars Episode V: The Empire Strikes Back, Luke Skywalker’s missing hand is replaced with a cybernetic prosthetic one.

Cybernetics - Wikipedia

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