A nanoradio (also called carbon nanotube radio) is a nanotechnology acting as a radio transmitter and receiver by using carbon nanotubes. One of the first nanoradios was constructed in 2007 by researchers under Alex Zettl at the University of California, Berkeley where they successfully transmitted an audio signal.[1] Due to the small size, nanoradios can have several possible applications such as radio function in the bloodstream.[2]
The first observation of a nanoradio can be accredited to a Japanese physicist Sumio Iijima in 1991 who saw a "a luminous discharge of electricity" coming from a carbon nanotube on a graphite electrode.[2] On October 31, 2007, a team of researchers under Alex Zettl at the University of California, Berkeley created one of the first nanoradios.[1] Their experiment consisted of placing a multilayered nanotube placed on a silicon electrode and connecting it to a counter electrode through a wire and a DC battery. Both the electrode and nanotube were also put in a vacuum of about 10−7Torr.[3] They then placed the apparatus into a high-resolution transmission electron microscope to document the movement of the nanotube. They observed the nanoradio vibrating and transmitted a song called "Layla" by Eric Clapton.[4] After some minor adjustments, the team was able to transmit and receive signals from a couple meters across the laboratory;[2] however, the initial audio receptions from the radio were scratchy which Zettl believed was due to the lack of a better vacuum.[1]
Properties
The small size, roughly 10 nanometers wide and hundreds of nanometers long, and composition of nanoradios provide several distinct properties. The small size of nanoradios enables electrons to pass through without much friction, making nanoradios efficient conductors. Nanoradios can also come in different sizes; they can be double-walled, tripled-walled and multi-walled. Aside from the different sizes, nanoradios can also take different shapes such as bent, straight or toroidal. Common among all nanoradios is how relatively strong they are. The resistance can be attributed to the strength of the bonds between carbon atoms.[2]
Function
The fundamental parts of a radio are the antenna, tuner, demodulator and amplifier. Carbon nanotubes are special in that they can function as these parts without the need of extra circuitry.
Antenna
The nanoradio is small enough for electromagnetic signals to mechanically vibrate the nanoradio. The nanoradio essentially acts as an antenna by vibrating with the same frequency as the signal from incoming electromagnetic waves; this is in contrast with traditional radio antennas, which are generally stationary.[3] The nanotube can vibrate in high frequencies, from "thousands to millions of times per second."[1]
Tuner
The nanoradio can also function as a tuner by extending or reducing the length of the nanotube; doing so changes the resonance frequency at which it vibrates, enabling the radio to tune into specific frequencies. The length of the nanotube can be extended by pulling the tip with a positive electrode and can be shortened by removing atoms off the tip.[1] Consequently, changing the length is permanent and can't be reversed; however, the method of varying the electric field can also affect the frequency that the nanoradio responds without being permanent.[2]
Amplifier
As a benefit of the microscopic size and needle-like shape, the nanoradio functions naturally as an amplifier. The nanoradio exhibits field emission, in which a small voltage emits a flow of electrons; due to this, a small electromagnetic wave would produce a large flow of electrons, amplifying the signal.[2]
Demodulator
Demodulation is essentially the separation of the information signal from the carrier wave. When the nanoradio vibrates in sync with the carrier wave, the nanoradio responds only to the information signal and ignores the carrier wave; and so, the nanoradio can act as a demodulator without the need of circuitry.[2]
Medical Application
Currently, chemotherapy uses chemicals that harm not only cancerous cells, but also healthy ones since they are put into the blood stream. Nanoradios can be used to prevent damage to healthy cells by remotely communicating with the radio to release drugs and specifically target cancerous cells. Nanoradios can also be injected into individual cells to release certain chemicals, enabling repair of specific cells.[2] Nanoradios can also be used to monitor insulin levels of diabetes patients and use that information to release a drug or chemical.[5]
Complications
The implanting of nanoradios in the body are currently not feasible due to power dissipation. The nanoradio radiates about 4.5 x 10−27 W of electromagnetic power; however, much of this power would be lost when passing through the body. The amount of energy input can be increased, but would generate too much heat in the body, posing a safety risk. Other issues include the difficulty of constructing a nanoradio due to its nanoscale size, requiring quantum models and precision to manufacture.[6]
References
^ abcdeSanders, Robert (31 October 2007). "Single nanotube makes world's smallest radio". UC Berkleley News. Retrieved 2016-11-05.
^ abcdefghRegis, Ed (2009-01-01). "The World's Smallest Radio". Scientific American. 300 (3): 40–45. Bibcode:2009SciAm.300c..40R. doi:10.1038/scientificamerican0309-40. PMID 19253772.
^ ab"Nanotube Radio" (PDF). K. Jensen, J. Weldon, H. Garcia, and A. Zettl.
^Chemistry World (2007-11-01), Real single nanotube radio plays Layla, archived from the original on 2021-12-21, retrieved 2016-10-24
^Service, Robert F. "TR10: NanoRadio - MIT Technology Review". MIT Technology Review. Retrieved 2016-11-05.
^Diaz, R. E.; Sebastian, T. (2013-12-18). "Electromagnetic limits to radiofrequency (RF) neuronal telemetry". Scientific Reports. 3: 3535. Bibcode:2013NatSR...3E3535D. doi:10.1038/srep03535. ISSN 2045-2322. PMC3866607. PMID 24346503.
August 23, 2023
nanoradio, nanoradio, also, called, carbon, nanotube, radio, nanotechnology, acting, radio, transmitter, receiver, using, carbon, nanotubes, first, nanoradios, constructed, 2007, researchers, under, alex, zettl, university, california, berkeley, where, they, s. A nanoradio also called carbon nanotube radio is a nanotechnology acting as a radio transmitter and receiver by using carbon nanotubes One of the first nanoradios was constructed in 2007 by researchers under Alex Zettl at the University of California Berkeley where they successfully transmitted an audio signal 1 Due to the small size nanoradios can have several possible applications such as radio function in the bloodstream 2 Contents 1 History 2 Properties 3 Function 3 1 Antenna 3 2 Tuner 3 3 Amplifier 3 4 Demodulator 4 Medical Application 5 Complications 6 ReferencesHistory EditThe first observation of a nanoradio can be accredited to a Japanese physicist Sumio Iijima in 1991 who saw a a luminous discharge of electricity coming from a carbon nanotube on a graphite electrode 2 On October 31 2007 a team of researchers under Alex Zettl at the University of California Berkeley created one of the first nanoradios 1 Their experiment consisted of placing a multilayered nanotube placed on a silicon electrode and connecting it to a counter electrode through a wire and a DC battery Both the electrode and nanotube were also put in a vacuum of about 10 7 Torr 3 They then placed the apparatus into a high resolution transmission electron microscope to document the movement of the nanotube They observed the nanoradio vibrating and transmitted a song called Layla by Eric Clapton 4 After some minor adjustments the team was able to transmit and receive signals from a couple meters across the laboratory 2 however the initial audio receptions from the radio were scratchy which Zettl believed was due to the lack of a better vacuum 1 Properties EditThe small size roughly 10 nanometers wide and hundreds of nanometers long and composition of nanoradios provide several distinct properties The small size of nanoradios enables electrons to pass through without much friction making nanoradios efficient conductors Nanoradios can also come in different sizes they can be double walled tripled walled and multi walled Aside from the different sizes nanoradios can also take different shapes such as bent straight or toroidal Common among all nanoradios is how relatively strong they are The resistance can be attributed to the strength of the bonds between carbon atoms 2 Function EditThe fundamental parts of a radio are the antenna tuner demodulator and amplifier Carbon nanotubes are special in that they can function as these parts without the need of extra circuitry Antenna Edit The nanoradio is small enough for electromagnetic signals to mechanically vibrate the nanoradio The nanoradio essentially acts as an antenna by vibrating with the same frequency as the signal from incoming electromagnetic waves this is in contrast with traditional radio antennas which are generally stationary 3 The nanotube can vibrate in high frequencies from thousands to millions of times per second 1 Tuner Edit The nanoradio can also function as a tuner by extending or reducing the length of the nanotube doing so changes the resonance frequency at which it vibrates enabling the radio to tune into specific frequencies The length of the nanotube can be extended by pulling the tip with a positive electrode and can be shortened by removing atoms off the tip 1 Consequently changing the length is permanent and can t be reversed however the method of varying the electric field can also affect the frequency that the nanoradio responds without being permanent 2 Amplifier Edit As a benefit of the microscopic size and needle like shape the nanoradio functions naturally as an amplifier The nanoradio exhibits field emission in which a small voltage emits a flow of electrons due to this a small electromagnetic wave would produce a large flow of electrons amplifying the signal 2 Demodulator Edit Demodulation is essentially the separation of the information signal from the carrier wave When the nanoradio vibrates in sync with the carrier wave the nanoradio responds only to the information signal and ignores the carrier wave and so the nanoradio can act as a demodulator without the need of circuitry 2 Medical Application EditCurrently chemotherapy uses chemicals that harm not only cancerous cells but also healthy ones since they are put into the blood stream Nanoradios can be used to prevent damage to healthy cells by remotely communicating with the radio to release drugs and specifically target cancerous cells Nanoradios can also be injected into individual cells to release certain chemicals enabling repair of specific cells 2 Nanoradios can also be used to monitor insulin levels of diabetes patients and use that information to release a drug or chemical 5 Complications EditThe implanting of nanoradios in the body are currently not feasible due to power dissipation The nanoradio radiates about 4 5 x 10 27 W of electromagnetic power however much of this power would be lost when passing through the body The amount of energy input can be increased but would generate too much heat in the body posing a safety risk Other issues include the difficulty of constructing a nanoradio due to its nanoscale size requiring quantum models and precision to manufacture 6 References Edit a b c d e Sanders Robert 31 October 2007 Single nanotube makes world s smallest radio UC Berkleley News Retrieved 2016 11 05 a b c d e f g h Regis Ed 2009 01 01 The World s Smallest Radio Scientific American 300 3 40 45 Bibcode 2009SciAm 300c 40R doi 10 1038 scientificamerican0309 40 PMID 19253772 a b Nanotube Radio PDF K Jensen J Weldon H Garcia and A Zettl Chemistry World 2007 11 01 Real single nanotube radio plays Layla archived from the original on 2021 12 21 retrieved 2016 10 24 Service Robert F TR10 NanoRadio MIT Technology Review MIT Technology Review Retrieved 2016 11 05 Diaz R E Sebastian T 2013 12 18 Electromagnetic limits to radiofrequency RF neuronal telemetry Scientific Reports 3 3535 Bibcode 2013NatSR 3E3535D doi 10 1038 srep03535 ISSN 2045 2322 PMC 3866607 PMID 24346503 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