Featured Research

from universities, journals, and other organizations

Nanowires Can Now Be Controlled Down To Single Atom Level

Date:
December 25, 2008
Source:
Lund University
Summary:
Nanoscience researchers have shown that they can control the growth and crystal structure of nanowires down to the single atom level.

Nanoscience researchers at Lund University in Sweden have shown that they can control the growth and crystal structure of nanowires down to the single atom level.

This research is described in an article to appear in Nature Nanotechnology, with Philippe Caroff and Kimberly Dick of the Nanometer Structure Consortium (nmC) at Lund University as the main authors.

According to Professor Lars Samuelson, this is a breakthrough both in the development of nanowire growth, and in the understanding of the fundamental materials physics processes involved.

It has been known for a long time that most semiconductor materials used in nanowires, including the very interesting material Indium Arsenide (InAs) studied here, are affected by irregularities in the layer-by-layer stacking sequence. These affect the electronic and optical properties in uncontrolled ways, and are therefore undesirable.

But now Philippe Caroff and Kimberly Dick have shown that it is possible to control these variations in great detail, which can be used for the development of new functions in nanowires.

It is now possible not only to fabricate perfect, defect-free nanowires, but also to switch freely between different crystal types along the length of a single nanowire, to produce a, so-called, superlattice, but still using only one chemical compound (InAs).

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

Although this result has been demonstrated primarily for the binary compound InAs, it is believed that the mechanisms controlling the nanowire structure can be generally applied to related semiconductor materials used in nanotechnology.

With this technique it is also possible to grow highly regular nanowires with a perfect periodic facetted character. Electron microscopy images show that the arrangement of atoms in the nanowire crystal exactly matches theoretical simulations. The electronic and optical properties of these wires have not been investigated yet but will be in the focus of theoretical as well as experimental studies.

The nanowires in this study had a typical diameter of 10-100 nanometers (one nanometer is one-millionth of one millimeter) and length of a few micrometers (one-thousandth of one millimeter).

The wires are produced by “baking” in an oven with a supply material in gas form, and grow from small microscopic gold “seeds”. Kimberly Dick defended a PhD thesis last year containing many electron microscopy images of similar nanowires.

The researchers are working to find commercial applications for these nanowires in electronics and opto-electronics, such as for light-emission and solar cell applications.


Story Source:

The above story is based on materials provided by Lund University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Caroff et al. Controlled polytypic and twin-plane superlattices in III-V nanowires. Nature Nanotechnology, 2008; DOI: 10.1038/nnano.2008.359

Cite This Page:

Lund University. "Nanowires Can Now Be Controlled Down To Single Atom Level." ScienceDaily. ScienceDaily, 25 December 2008. <www.sciencedaily.com/releases/2008/12/081223091433.htm>.
Lund University. (2008, December 25). Nanowires Can Now Be Controlled Down To Single Atom Level. ScienceDaily. Retrieved September 2, 2014 from www.sciencedaily.com/releases/2008/12/081223091433.htm
Lund University. "Nanowires Can Now Be Controlled Down To Single Atom Level." ScienceDaily. www.sciencedaily.com/releases/2008/12/081223091433.htm (accessed September 2, 2014).

Share This




More Matter & Energy News

Tuesday, September 2, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Google Teases India Event, Possible Android One Reveal

Google Teases India Event, Possible Android One Reveal

Newsy (Sep. 1, 2014) Google has announced a Sept. 15 event in India during which they're expected to reveal their Android One phones. Video provided by Newsy
Powered by NewsLook.com
Australian Airlines Relax Phone Ban Too

Australian Airlines Relax Phone Ban Too

Reuters - Business Video Online (Aug. 26, 2014) Qantas and Virgin say passengers can use their smartphones and tablets throughout flights after a regulator relaxed a ban on electronic devices during take-off and landing. As Hayley Platt reports the move comes as the two domestic rivals are expected to post annual net losses later this week. Video provided by Reuters
Powered by NewsLook.com
Hurricane Marie Brings Big Waves to California Coast

Hurricane Marie Brings Big Waves to California Coast

Reuters - US Online Video (Aug. 26, 2014) Huge waves generated by Hurricane Marie hit the Southern California coast. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Chinese Researchers Might Be Creating Supersonic Submarine

Chinese Researchers Might Be Creating Supersonic Submarine

Newsy (Aug. 26, 2014) Chinese researchers have expanded on Cold War-era tech and are closer to building a submarine that could reach the speed of sound. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins