Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Gold Nano Anchors Put Nanowires in Their Place

Abstract:
NIST researchers have demonstrated a technique for growing well-formed, single-crystal nanowires

Gold Nano Anchors Put Nanowires in Their Place

Researchers at the National Institute of Standards and Technology (NIST) have demonstrated a technique for growing well-formed, single-crystal nanowires in place—and in a predictable orientation—on a commercially important substrate.

The method uses nanoparticles of gold arranged in rows on a sapphire surface as starting points for growing horizontal semiconductor "wires" only 3 nanometers (nm) in diameter. Other methods produce semiconductor nanowires more than 10 nm in diameter. NIST chemists' work was highlighted in the Oct. 11 issue of Applied Physics Letters.*

Scanning electron microscope image shows rows of horizontal zinc-oxide nanowires grown on a sapphire surface. The gold nanoparticles are visible on the ends of each row.
Scanning electron microscope image shows rows of horizontal zinc-oxide nanowires grown on a sapphire surface. The gold nanoparticles are visible on the ends of each row. Click for larger version. Copyright © NIST
Illustration shows how crystalline zinc oxide nanowires (blue) push
Illustration shows how crystalline zinc oxide nanowires (blue) push "seeds" of gold nanoparticles (red) forward as they grow. Click for larger version. Copyright © NIST

Part of the vision of nanotechnology is the possibility of building powerful, extraordinarily compact sensors and other devices out of atomic-scale components. So-called “nanowires”—long thin crystals of, e.g., a semiconductor— could not only link nanoelectronic devices like conventional wire but also function as devices themselves, tipped with photodetector or light-emitting elements, for example.

An obvious stumbling block is the problem of working with components so small that only the most sophisticated measurement instruments can even track them. To date, the most successful nanowire alignment method involved growing large numbers of the rod-like crystals on a suitable base like blades of grass, shearing them off, mixing them in a solvent, and forcing them to align by either flow or surface confinement on the test substrate to orient most of the crystals in a specific horizontal direction. Further photolithography steps are required to ensure that nanowires are positioned correctly.

In contrast, the NIST technique grows arrays of nanowires made of zinc oxide, a semiconductor widely used in optoelectronics, with precise alignments. The gold "anchors" are placed with a chemical etching step and the orientation of the wires—horizontal, vertical or at a 60 degree angle from the surface—is determined by tweaking the size of the gold particles.

*B. Nikoobakht, C.A. Michaels, S.J. Stranick, M. Vaudin, Applied Physics Letters, Oct. 11, 2004, Vol. 85, Issue 15, pp. 3244-3246.


Media contact:
Michael Baum
michael.baum@nist.gov
(301) 975-2763

Copyright © NIST

If you have a comment, please 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

Possible Futures

Nanofiltration Membrane Market 2015 - Global Industry Survey, Analysis, Size, Share, Outlook and Forecast to 2020 July 31st, 2015

Nanozirconia Market 2015 - Global Industry Survey, Analysis, Size, Share, Outlook and Forecast to 2020 July 31st, 2015

Self-Healing Nano Anti-rust Coatings Market 2015 - Global Industry Survey, Analysis, Size, Share, Outlook and Forecast to 2020 July 31st, 2015

Nano Spray Instrument Market 2015 - Global Industry Survey, Analysis, Size, Share, Outlook and Forecast to 2020 July 31st, 2015

Sensors

Quantum states in a nano-object manipulated using a mechanical system August 3rd, 2015

Diagnosis of Salmonella Bacterium-Caused Food Poisoning by Biosensors August 3rd, 2015

Gold-diamond nanodevice for hyperlocalised cancer therapy: Gold nanorods can be used as remote controlled nanoheaters delivering the right amount of thermal treatment to cancer cells, thanks to diamond nanocrystals used as temperature sensors August 1st, 2015

Advances and Applications in Biosensing, Sensor Power, and Sensor R&D to be Covered at Sensors Global Summit August 1st, 2015

Nanoelectronics

Small tilt in magnets makes them viable memory chips August 3rd, 2015

Better together: Graphene-nanotube hybrid switches August 3rd, 2015

MIPT researchers clear the way for fast plasmonic chips August 3rd, 2015

Superfast fluorescence sets new speed record: Plasmonic device has speed and efficiency to serve optical computers July 27th, 2015

Discoveries

Small tilt in magnets makes them viable memory chips August 3rd, 2015

Better together: Graphene-nanotube hybrid switches August 3rd, 2015

Vaccine with virus-like nanoparticles effective treatment for RSV, study finds August 3rd, 2015

MIPT researchers clear the way for fast plasmonic chips August 3rd, 2015

Announcements

Quantum states in a nano-object manipulated using a mechanical system August 3rd, 2015

Nanoparticles used to breach mucus barrier in lungs: Proof-of-concept study conducted in mice a key step toward better treatments for lung diseases August 3rd, 2015

Promising Step Taken in Iran towards Treatment of Spinal Cord Injury August 3rd, 2015

Diagnosis of Salmonella Bacterium-Caused Food Poisoning by Biosensors August 3rd, 2015

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