Featured Research

from universities, journals, and other organizations

Building bridges between nanowires

Date:
September 20, 2013
Source:
University of Twente
Summary:
Place a layer of gold only a few atoms high on a surface bed of germanium, apply heat to it, and wires will form of themselves. These wires are no more than a few atoms in height and are separated by no more than 1.6 nanometres. Nanotechnologists bridge this small 'gap' with a copper-phthalocyanine molecule, which is able to rotate if the electrons coursing towards it possess sufficient energy, allowing it to function as a switch. This might allow researchers to identify new properties the nanowires may possess.

A copper-phthalocyanine molecule bridges the 1.6 nanometre-wide gap between two gold nanowires. The copper atom of this molecule floats in the vacuum above this 'gap' between the wires
Credit: University of Twente

Place a layer of gold only a few atoms high on a surface bed of germanium, apply heat to it, and wires will form of themselves. Gold-induced wires is what Mocking prefers to call them. Not 'gold wires', as the wires are not made solely out of gold atoms but also contain germanium. They are no more than a few atoms in height and are separated by no more than 1.6 nanometres (a nanometre is one millionth of a millimetre). Nanotechnologists bridge this small 'gap' with a copper-phthalocyanine molecule. A perfect fit. This molecule was found to be able to rotate if the electrons coursing towards it possess sufficient energy, allowing it to function as a switch. What's more: the copper atom of this molecule floats in the vacuum above the gap -- fully detached. This might allow researchers to identify new properties the nanowires may possess.

Quantum effects

Mocking also managed to craft new 1D structures with two different metals, iridium and cobalt -- obtaining entirely different results. For instance, he was able to prove that quantum effects occur to iridium when heated to room temperature, leading to the wires always being 4.8 nanometres, or a multiple thereof, in length. This astonishing result was published in Nature Communications earlier this year. When cobalt, the third of the metals, was heated, no wires were formed. Instead, little 'islands' and 'nanocrystals' appeared.

Bottom-up nanoelectronics

Mocking used the semiconductor germanium as substrate for each of the three metals, as it is easy to work with at relatively low temperatures and possesses a suitable crystal structure. Scanning Tunneling Microscopy (STM) is ideally suited to investigate these structures. His research is of fundamental importance, as surprising physical effects are noticeable when deconstructing to the lower dimensions, up to 1D. It also allows for the 'bottom-up' crafting of electronic switches: start with the smallest, self-organising structures, add molecules, and proceed from there. The process is still in its infancy, but may become an alternative to the current 'top-down' approach, which entails removing ever more parts from a larger structure. The gold and iridium-inducted wires may form starting blocks for the process. The cobalt islands, though less suitable to this new type of electronics science, do provide fundamental new insights.


Story Source:

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


Journal Reference:

  1. Tijs F. Mocking, Pantelis Bampoulis, Nuri Oncel, Bene Poelsema, Harold J. W. Zandvliet. Electronically stabilized nanowire growth. Nature Communications, 2013; 4 DOI: 10.1038/ncomms3387

Cite This Page:

University of Twente. "Building bridges between nanowires." ScienceDaily. ScienceDaily, 20 September 2013. <www.sciencedaily.com/releases/2013/09/130920094413.htm>.
University of Twente. (2013, September 20). Building bridges between nanowires. ScienceDaily. Retrieved September 30, 2014 from www.sciencedaily.com/releases/2013/09/130920094413.htm
University of Twente. "Building bridges between nanowires." ScienceDaily. www.sciencedaily.com/releases/2013/09/130920094413.htm (accessed September 30, 2014).

Share This



More Matter & Energy News

Tuesday, September 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Argentina's Tax Evaders Detected, Hunted Down by Drones

Argentina's Tax Evaders Detected, Hunted Down by Drones

AFP (Sep. 30, 2014) Argentina doesn't only have Lionel Messi the footballer, it has now also acquired "Mesi" the drone system which monitors undeclared mansions, swimming pools and soy fields to curb tax evasion in the country. Duration: 01:18 Video provided by AFP
Powered by NewsLook.com
Do Video Games Trump Brain Training For Cognitive Boosts?

Do Video Games Trump Brain Training For Cognitive Boosts?

Newsy (Sep. 29, 2014) More and more studies are showing positive benefits to playing video games, but the jury is still out on brain training programs. Video provided by Newsy
Powered by NewsLook.com
CERN Celebrates 60 Years of Science

CERN Celebrates 60 Years of Science

Reuters - Business Video Online (Sep. 29, 2014) CERN, the European Organisation for Nuclear Research, celebrates 60 years of bringing nations together through science. As Joanna Partridge reports from inside the famous science centre it's also planning to turn the Large Hadron Collider particle accelerator back on after an upgrade. Video provided by Reuters
Powered by NewsLook.com
This 'Invisibility Cloak' Is Simpler Than Most

This 'Invisibility Cloak' Is Simpler Than Most

Newsy (Sep. 28, 2014) Researchers from the University of Rochester have created a type of invisibility cloak with simple focal lenses. 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:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

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