Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Swedish scientists make breakthrough in nanowire growth control

Abstract:
Scientists in Sweden have discovered new ways to control the growth and structure of nanowires at the single-atom level. Their findings, which provide major insights into materials physics, have come out of the NODE (' Nanowire-based one-dimensional electronics') project, funded with approximately EUR 9.5 million under the EU's Sixth Framework Programme (FP6). The study is published in the January issue of Nature Nanotechnology.

Swedish scientists make breakthrough in nanowire growth control

Sweden | Posted on January 5th, 2009

Nanowires, also known as 'quantum wires,' are single strips of atoms that are produced only in laboratories. Among other things, semiconductor nanowires show promise for nanoelectronics, as they might be used to link miniscule components within extremely small circuits in a 'molecular computer'.

Most semiconductor materials used to make nanowires develop irregularities and faults as they grow. These defects have a negative impact on the material's electronic and optical properties. In this latest research, scientists used Indium Arsenide (InAs), a valuable material in nanoelectonics, electron transport and spintronics, to determine how the structure of nanowires could be more carefully controlled.

'Two of the key parameters needed to control the crystal structure are nanowire diameter and the temperature at which they are fabricated,' explained co-author Kimberly Dick at Lund University in Sweden. 'But there are in total at least 10 to 12 different parameters that must be controlled when producing the nanowires.'

The researchers grew nanowires typically 10 to 100 nanometres in diameter and a few micrometers long. They did this by 'baking' the material in its gas form, using microscopic gold 'seeds' to start the wire. The diameter of the wire was controlled by changing the size of the seed. They successfully demonstrated that it is possible to control the growth of the nanowires, thereby drastically reducing irregularities.

In addition, they created different crystal structures of the same material by varying the temperature between 400ºC and 480ºC. By selectively tuning the crystal structure of InAs, they were able to consistently fabricate very strong 'superlattices' within single nanowires.

The scientists showed that it is possible to fabricate defect-free nanowires, and that one may alternate between different crystal structures along the length of a single nanowire. The new techniques, which the authors believe can be applied to other semiconductor materials, open the door for researchers to develop new functions for nanowires.

The study provides experimental evidence for a theory that has been widely discussed. 'Although a diameter-dependent crystal structure has been proposed by many authors,' the study reads, 'this is the first time that such an effect has been experimentally demonstrated, with a high level of control.' Electron microscopy images show that the arrangement of atoms in the nanowire crystal exactly matches theoretical simulations.

According to Professor Lars Samuelson, also of Lund University, 'The results achieved here establish our position in this area of science and technology and give our ambitions an increased credibility.' The authors hope their findings may lead to developments in light-emission and solar cell applications.

####

For more information, please click here

Copyright © Cordis

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Arrowhead to Present at BioCentury's NewsMakers in the Biotech Industry Conference September 19th, 2014

SouthWest NanoTechnologies (SWeNT) Receives NIST Small Business Innovation Research (SBIR) Phase 1 Award to Produce Greater than 99% Semiconducting Single-Wall Carbon Nanotubes September 19th, 2014

Toward optical chips: A promising light source for optoelectronic chips can be tuned to different frequencies September 19th, 2014

New research points to graphene as a flexible, low-cost touchscreen solution September 19th, 2014

Nanotubes/Buckyballs

SouthWest NanoTechnologies (SWeNT) Receives NIST Small Business Innovation Research (SBIR) Phase 1 Award to Produce Greater than 99% Semiconducting Single-Wall Carbon Nanotubes September 19th, 2014

Scientists refine formula for nanotube types: Rice University theorists determine factors that give tubes their chiral angles September 17th, 2014

‘Small’ transformation yields big changes September 16th, 2014

Rice rolls 'neat' nanotube fibers: Rice University researchers' acid-free approach leads to strong conductive carbon threads September 15th, 2014

Discoveries

Toward optical chips: A promising light source for optoelectronic chips can be tuned to different frequencies September 19th, 2014

New research points to graphene as a flexible, low-cost touchscreen solution September 19th, 2014

CiQUS researchers design an artificial nose to detect DNA differentiation with single nucleotide resolution September 18th, 2014

Big Results Require Big Ambitions: Three young UCSB faculty receive CAREER awards from the National Science Foundation September 18th, 2014

Announcements

Arrowhead to Present at BioCentury's NewsMakers in the Biotech Industry Conference September 19th, 2014

SouthWest NanoTechnologies (SWeNT) Receives NIST Small Business Innovation Research (SBIR) Phase 1 Award to Produce Greater than 99% Semiconducting Single-Wall Carbon Nanotubes September 19th, 2014

Toward optical chips: A promising light source for optoelectronic chips can be tuned to different frequencies September 19th, 2014

New research points to graphene as a flexible, low-cost touchscreen solution September 19th, 2014

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More














ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE