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Nanotube radio

Nanoletters上最新一期报道了两篇关于的纳米管收音机的文章！贴在这里与大家分享一下！
【文献标题】[b][size=5]Carbon Nanotube Radio [/size][/b]
【作者】 [b]Chris Rutherglen and[/b] [b]Peter Burke[url=http://pubs.acs.org/cgi-bin/sample.cgi/nalefd/2007/7/i11/html/nl0714839.html#nl0714839AF1][color=#0000ff]*[/color][/url][/b]
【文献信息】[i]Nano Lett.,[/i] [b]7[/b] (11), 3296 -3299, 2007. 10.1021/nl0714839 S1530-6984(07)01483-X
【文献摘要】 Here we report experimental results for a carbon nanotube (CNT) based amplitude-modulated (AM) demodulator for modulation frequencies up to 100 kHz. Further, the CNT based demodulator was successfully demonstrated in an actual AM radio receiver operating at a carrier frequency of 1 GHz and capable of demodulating high-fidelity audio. The demodulation originates from the nonlinear current-voltage ([i]I[/i]DS vs [i]V[/i]DS) characteristic of the CNT, which induces rectification of a portion of the applied RF signal. By properly biasing the CNT such that the operating point is centered on the maximum nonlinear portion of the [i]I[/i]-[i]V[/i] curve, one can maximize the demodulation effect. This represents a simple application of carbon nanotubes and nanotechnology to the wireless realm.
【内容点评】 [attach]2175[/attach]
Figure 1 Schematic of the test-setup for the CNT-based AM demodulator. SEM image of a CNT (right).
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Figure 5 (A) Demodulated signal at various frequencies. Parasitic capacitance shorts the RF signal at frequencies >2 GHz. (B) Schematic of RF equivalent circuit.

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Figure 6 Schematic of CNT radio demonstration.
【下载链接】：
[url=http://pubs.acs.org/cgi-bin/sample.cgi/nalefd/2007/7/i11/html/nl0714839.html]http://pubs.acs.org/cgi-bin/sample.cgi/nalefd/2007/7/i11/html/nl0714839.html[/url]
[url=http://www.box.net/shared/8xcvadf5i8]http://www.box.net/shared/8xcvadf5i8[/url]

【文献标题】[b][size=5]Nanotube Radio [/size][/b]
【作者】[b]K. Jensen,[/b] [b]J. Weldon,[/b] [b]H. Garcia, and[/b] [b]A. Zettl[url=http://pubs.acs.org/cgi-bin/article.cgi/nalefd/2007/7/i11/html/nl0721113.html#nl0721113AF1][color=#0000ff]*[/color][/url][/b]
【文献信息】[i]Nano Lett.,[/i] [b]7[/b] (11), 3508 -3511, 2007. 10.1021/nl0721113 S1530-6984(07)02111-X
【文献摘要】We have constructed a fully functional, fully integrated radio receiver from a single carbon nanotube. The nanotube serves simultaneously as all essential components of a radio: antenna, tunable band-pass filter, amplifier, and demodulator. A direct current voltage source, as supplied by a battery, powers the radio. Using carrier waves in the commercially relevant 40-400 MHz range and both frequency and amplitude modulation techniques, we demonstrate successful music and voice reception. 【亮点】
[attach]2178[/attach]
Figure 1 Block diagram for a traditional radio. All four essential components of a radio, antenna, tuner, amplifier, and demodulator may be implemented with a single carbon nanotube.
[attach]2179[/attach]
Figure 2 (a) Schematic of the nanotube radio. Radio transmissions tuned to the nanotube's resonance frequency force the charged nanotube to vibrate. Field emission of electrons from the tip of the nanotube is used to detect the vibrations and also amplify and demodulate the signal. A current measuring device, such as a sensitive speaker, monitors the output of the radio. (b) Transmission electron micrographs of a nanotube radio off and on resonance during a radio transmission.
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Figure 3 Transmitted and received audio waveforms (inset) and frequency spectra of 2 seconds of the song "Good Vibrations" by the Beach Boys. The nanotube radio faithfully reproduces the audio signal, and indeed the song is easily recognizable by ear (see Supporting Information).
【下载链接】[url=http://pubs.acs.org/cgi-bin/article.cgi/nalefd/2007/7/i11/html/nl0721113.html]http://pubs.acs.org/cgi-bin/article.cgi/nalefd/2007/7/i11/html/nl0721113.html[/url]
[url=http://www.box.net/shared/7sq6fnfxhq]http://www.box.net/shared/7sq6fnfxhq[/url]

真的不错。羡慕
谢谢

真的不错。羡慕
谢谢

回复 2# 的帖子

关于CNT的研究实在太多啦，但真正实际应用的却比较少，这两篇利用CNT的电性能做了一些应用，虽然离我们的生活还是有一定的距离，但毕竟是慢慢靠近啦！

:victory: :victory: :victory:

很好! 谢谢分享! :good1

Very interesting!!!!:handshake

News from Berkeley:

We have constructed a fully functional, fully integrated radio receiver, orders-of-magnitude smaller than any previous radio, from a single carbon nanotube. The single nanotube serves, at once, as all major components of a radio: antenna, tuner, amplifier, and demodulator. Moreover, the antenna and tuner are implemented in a radically different manner than traditional radios, receiving signals via high frequency mechanical vibrations of the nanotube rather than through traditional electrical means.

We have already used the nanotube radio to receive and play music from FM radio transmissions such as Layla by Eric Clapton (Derek and the Dominos) and the Beach Boys' Good Vibrations.

The nanotube radio's extremely small size could enable radical new applications such as radio controlled devices small enough to exist in the human bloodstream, or simply smaller, cheaper, and more efficient wireless devices such as cellular phones.

I'm glad to see they have such good taste in music!

oh,my god , so interesting and advance