Trilingual World Observatory: italiano, english, română. GLOBAL NEWS & more... di Redazione
\\ Home Page : Articolo
Nanotech: The age of nano-electronics: scientists develop one of the world’s smallest circuits.
By Admin (from 24/02/2012 @ 14:02:46, in en - Science and Society, read 2694 times)

A team of researchers from led by Guillaume Gervais from McGill’s Physics Department and Mike Lilly from Sandia National Laboratories, have managed to develop one of the smallest electronic circuits in the world using nanowires spaced across each other by a distance so small, it has to be measured at an atomic level.

Miniaturization has been the dominant trend in the digital industry for years, and nano-electronics, with which scientists have been fiddling for the past 20 years, is considered as the next obvious step, allowing for even smaller and powerful electronic devices.

“People have been working on nanowires for 20 years,” says Sandia lead researcher Mike Lilly. “At first, you study such wires individually or all together, but eventually you want a systematic way of studying the integration of nanowires into nanocircuitry. That’s what’s happening now. It’s important to know how nanowires interact with each other rather than with regular wires.”

While nanowires have been studied extensively in the past, this current study is the first of its kind to approach how the wires in an electronic circuit interact with one another when packed so tightly together. The researchers used gallium-arsenide nanowire structures which they placed one above the other, separated by only a few atomic layers of extremely pure, home-grown crystal – two wires separated by only about 150 atoms or 15 nanometers (nm).

At this extremely tiny scale, new properties and characterisctics arise, along with inherent issues in the path of the researcher’s study. For one, the nano-wires have been envisoned as a 1-D structure, very different from your usual, bulk 3-D wire common in any kind of electrical device. Through these types of wires, current can only flow in one direction, not horizontally, vertically, back/forward like in a typical 3-D capable.

“In the long run, our test device will allow us to probe how 1-D conductors are different from 2-D and 3-D conductors,” Lilly said. “They are expected to be very different, but there are relatively few experimental techniques that have been used to study the 1-D ground state.”

At the nanoscale, also, the behavior of the circuit is described by quantum physics. In our case, by the introduction of Coulomb’s drag effect. This force operates between wires, and is inversely proportional to the square of the clearance. This is why in conventional circuitry, where the gap between wires is quite visible, this drag force can be considered negligible, however at nanodistances, the force becomes large enough for it to disturb electrons. This causes the current flowing through to the nanowires to march in opposite directions.

This means that a current in one wire can produce a current in the other one that is either in the same or the opposite direction.

“The amount is very small,” said Lilly, “and we can’t measure it. What we can measure is the voltage of the other wire.”

Coulomb’s drag effect is still not very well understood at this time, however what is know is that “enough electrons get knocked along that they provide positive source at one wire end, negative at the other,” Lilly said.

Yes, nanowires will allow for a even smaller scale of the digital world, however this is just the most visible benefit, out of many which are set to revolutionize electronics in the following decades.

One of the biggest hassles scientists working in the field of electronics at this time is how to control dissipated heat, the energy lost to the environment. This is a great concern to computer designers especially since millions of integrated circuits are currently employed in most devices today, and the heat generated by them has to be controlled. Well-known theorist Markus Büttiker speculates that it may be possible to harness the energy lost as heat in one wire by using other wires nearby. Basically, as the distance is smaller, the heat generated will be smaller as adjacent wires can easily absorb those minute quantities.

Also, speed will be a parameter which will be improved, as smaller distances translate in shorter time for signals to travel from one point to another. In this present research, the Sandia National Laboratories experiment rendered an unexpected voltage increases of up to 25 percent.

Source: ZME Science

Articolo Articolo  Storico Storico Stampa Stampa  Share
Cannabis seeds, Autoflowering seeds, Greenhouse, Sweet Seeds, Spanish Passion
comments powered by Disqus
Nessun commento trovato. No comments found. Nici un comentariu găsit.

Anti-Spam: dial the numbers CAPTCHA
Text (max 5000 characters)
Nome - Name - Nume
Link ( OPTIONAL - visible on the site - NOT a must )

Tuo commento sarŕ visibile dopo la moderazione. - Your comment will be visible after the moderation. - Comentariul tău va fi vizibil după moderare.
Ci sono 19 persone collegate

< ottobre 2022 >

en - Global Observatory (605)
en - Science and Society (594)
en - Video Alert (346)
it - Osservatorio Globale (503)
it - Scienze e Societa (555)
it - Video Alerta (132)
ro - Observator Global (399)
ro - Stiinta si Societate (467)
ro - TV Network (143)
z - Games Giochi Jocuri (68)

Catalogati per mese - Filed by month - Arhivate pe luni:

Gli interventi piů cliccati

Ultimi commenti - Last comments - Ultimele comentarii:
Now Colorado is one love, I'm already packing suitcases;)
14/01/2018 @ 16:07:36
By Napasechnik
Nice read, I just passed this onto a friend who was doing some research on that. And he just bought me lunch since I found it for him smile So let me rephrase that Thank you for lunch! Whenever you ha...
21/11/2016 @ 09:41:39
By Anonimo
I am not sure where you are getting your info, but great topic. I needs to spend some time learning much more or understanding more. Thanks for fantastic information I was looking for this info for my...
21/11/2016 @ 09:40:41
By Anonimo


02/10/2022 @ 05:45:06
script eseguito in 832 ms