World?s Smallest Radio Receiver Developed in Carbon Nanotube
Posted by ~Ray @ 2007-11-27 21:25:43
The made of a single (CNT) was recently developed by researchers at the. The CNT radio has the four main components of a radio – an antenna an adjustable tuner an amplifier and a demodulator – all approximately in the size of a molecule. The CNT radio is “functionally equivalent to a standard AM or FM radio receiver,” says head of the in the at the University of California at Berkley.
Despite functional equivalence the CNT radio doesn’t work quite the same way as a conventional radio which uses to take advantage on a wire and bring forth an electrical current. The CNT radio starts vibrating mechanically when in tune with a radio communicate. The CNT then uses a small voltage and to displace electrons from the tip of the nanotube to a nearby electrode. The signal is then amplified and has its information stripped from the radio carrier wave through.
“The vibration is sort of fixed mechanically,” says Zettl. “but when we put this voltage across it to make it field emit that voltage pulls on the nanotube and tensions it.” The higher tension results in a higher frequency and makes the radio externally adjustable by controlling the be of voltage applied to the CNT.
The original application intended for CNT radios was for data communication in sensors. “We wanted to build that are measuring air and wet quality in a larger region desire over a city,” says Zettl. According to Zettl these CNT radios can also be useful for any applications that require very small low power radio devices including biological systems.
“The radio is so small that it would easily fit inside a living cell and not disturb it very much,” says Zettl. Another potential use he identified was receiving and stimulating biological vision commands to help regenerate vision for the blind.
“The bottom line is this thing works over a huge we can adjust it not just with tension but we can chop the nanotube off and alter it shorter and make it work in the FM range the AM range or in the cook range,” says Zettl.
Listen to as received by the CNT radio. There is a significant be of static noise but according to the University of California at Berkeley it was accomplished with none of the external circuitry to filter or affect the communicate typically open in macroscopic radios.
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