Science

Squids provide active ingredient for transistor that may communicate with living systems

Squids have provided the key ingredient for a proton-conducting transistor, that may allow man-made devices to communicate with living systems
Squids have provided the key ingredient for a proton-conducting transistor, that may allow man-made devices to communicate with living systems
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Squids have provided the key ingredient for a proton-conducting transistor, that may allow man-made devices to communicate with living systems
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Squids have provided the key ingredient for a proton-conducting transistor, that may allow man-made devices to communicate with living systems
The proton-conducting transistor (left) and a close-up of its chitosan fibers (right) (Image: University of Washington)
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The proton-conducting transistor (left) and a close-up of its chitosan fibers (right) (Image: University of Washington)

When it comes to sending and receiving information, man-made devices utilize negatively-charged particles commonly known as electrons. Biological systems such as human bodies, on the other hand, use protons via positively charged hydrogen atoms or ions. This would indicate that there is something of a language barrier, when we try to develop electronic devices that can communicate with living systems. That barrier could be on its way down, however, as scientists from the University of Washington have developed a transistor that can conduct pulses of protons - and they've done it with some help from our friends the cephalopods.

The prototype device is tiny, at just 5 microns in width - about one twentieth the width of a human hair. It is a field-effect transistor, in that it incorporates a gate, a drain and a source terminal for the current. Its proton current can be switched on and off, just like the electron current in a regular field-effect transistor.

Its active ingredient is chitosan, which is derived from chitin, a compound found in squid pen (part of the squid's body that is left over from when they had shells) and crustacean shells. Chitosan is very good at moving protons, and it forms numerous hydrogen bonds as it absorbs water, the protons then hopping from one bond to the next. The compound is biocompatible, is reportedly easy to manufacture, and can be extracted from squid pens and crab shells discarded by the food industry.

While the current version has a silicon base, future incarnations could be made completely biocompatible. In the immediate future, it could be used to study cells in laboratories. Down the road, however, it could conceivably be used to monitor or control biological processes within the body, or even to control prosthetic limbs.

Chitosan is also, incidentally, the active ingredient in experimental self-healing paint.

The U Washington research was published this week in the journal Nature Communications.

3 comments
Gerard René Supersad
Proton pulse transistors..... Halp! my brain just xploded. D\'ye know what this means for the kind of power that a Q of this type can control. I gotta follow this up.
katgod
I think the author is missing something here, water has + ions in it and if you need more try just about any acid. Not sure why the picture is not of crab shells as I think they are a much more common source of chitin. Sorry, but I expect better.
Dread Zontar
Is it just? Or is this the beginning of Isaac Asimov\'s positronics? :O Robots to serve me, at laaaaaaaaaast ... :D
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