Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > How to grow wires and tiny plates Liquid processing method developed at MIT can control the shapes of nanowires and produce complete electronic devices

Nanostructures are directly synthesized in parallel microfluidic channels (held by the metal frame) by flowing special chemical reactant solution through the tubing. The microfluidic not only creates the functional device, but is also the final packaged functional LED device itself.
Photo: Jaebum Joo
Nanostructures are directly synthesized in parallel microfluidic channels (held by the metal frame) by flowing special chemical reactant solution through the tubing. The microfluidic not only creates the functional device, but is also the final packaged functional LED device itself. Photo: Jaebum Joo

Abstract:
Researchers at MIT have found a way to control precisely the shapes of submicroscopic wires deposited from a solution — using a method that makes it possible to produce entire electronic devices through a liquid-based process.

How to grow wires and tiny plates Liquid processing method developed at MIT can control the shapes of nanowires and produce complete electronic devices

Cambridge, MA | Posted on July 14th, 2011

The team demonstrated the technique by producing a functional light-emitting diode (LED) array made of zinc oxide nanowires in a single beaker, instead of the several separate steps and devices required for conventional production. They were able to do so under relatively benign conditions, with moderate temperatures and no vacuum needed.

Unlike larger structures, with nanomaterials — those with dimensions measured in nanometers, or billionths of a meter — differences in shape can lead to dramatic differences in behavior. "For nanostructures, there's a coupling between the geometry and the electrical and optical properties," explains Brian Chow, a postdoc at MIT and co-author of a paper describing the results that was published July 10 in the journal Nature Materials. "Being able to tune the geometry is very powerful," he says. The system Chow and his colleagues developed can precisely control the aspect ratio (the ratio of length to width) of the nanowires to produce anything from flat plates to long thin wires.

There are other ways of making such nanowires, Chow says. "People have done a good job of controlling the morphology of wires by other means — using high temperatures, high pressure, or subtractive processing. But to be able to do this under these benign conditions is attractive," because it makes it possible to integrate such devices with relatively fragile materials such as polymers and plastics, he says.

Control over the shapes of the wires has until now been essentially a trial-and-error process. "We were trying to find out what is the controlling factor," explains Jaebum Joo PhD '10, who was the lead author of the paper.

The key turns out to be the electrostatic properties of the zinc oxide material as it grows from a solution, they found. Different compounds, when added to the solution, attach themselves electrostatically only to certain parts of the wire — just to the sides, or just to the ends — inhibiting the wire's growth in those directions. The amount of inhibition depends on the specific properties of the added compounds.

While this work was done with zinc oxide nanowires — a promising material that is being widely studied by researchers — the MIT scientists believe the method they developed for controlling the shape of the wires "can be expanded to different material systems," Joo says, perhaps including titanium dioxide which is being investigated for devices such as solar cells. Because the benign assembly conditions allow the material to be deposited on plastic surfaces, he says, it might enable the development of flexible display panels, for example.

But there are also many potential applications using the zinc oxide material itself, including the production of batteries, sensors, and optical devices. And the processing method has "the potential for large-scale manufacturing," Joo says.

The team also hopes to be able to use the method to make "spatially complex devices from the bottom up, out of biocompatible polymers." These could be used, for example, to make tiny devices that could be implanted in the brain to provide both sensing and stimulation.

In addition to Joo and Chow, the research was carried out by visiting scholar Manu Prakesh, along with Media Lab associate professors Edward Boyden and Joseph Jacobson. It was funded by the MIT Center for Bits and Atoms; the MIT Media Lab; the Korea Foundation for Advanced Studies; Samsung Electronics; the Harvard Society of Fellows; the Wallace H. Coulter Early Career Award; the NARSAD Young Investigator Award; the National Science Foundation; and the NIH Director's New Innovator Award.

####

For more information, please click here

Copyright © MIT

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

Lifeboat Foundation Responds to Largest Ebola Outbreak in History October 2nd, 2014

Iran's Sharif University to Host 4th Conference on Nanostructured Solar Cells October 2nd, 2014

Multifunctional Cotton Fabrics Produced in Iran Using Nanotechnology October 2nd, 2014

Graphene chips are close to significant commercialization October 1st, 2014

Display technology/LEDs/SS Lighting/OLEDs

'Greener,' low-cost transistor heralds advance in flexible electronics September 24th, 2014

Nanotechnology leads to better, cheaper LEDs for phones and lighting September 24th, 2014

Southampton scientists grow a new challenger to graphene September 23rd, 2014

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

Govt.-Legislation/Regulation/Funding/Policy

Platinum meets its match in quantum dots from coal: Rice University's cheap hybrid outperforms rare metal as fuel-cell catalyst October 1st, 2014

$18-million NSF investment aims to take flat materials to new heights: 2-D alternatives to graphene may enable exciting advances in electronics, photonics, sensors and other applications October 1st, 2014

Novel approach to magnetic measurements atom-by-atom October 1st, 2014

'Stealth' nanoparticles could improve cancer vaccines October 1st, 2014

Sensors

New Absorber Will Lead to Better Biosensor: Biosensors are more sensitive and able to detect smaller changes in the environment October 1st, 2014

Graphene and Amaranthus Superparamagnets: Breakthrough nanoparticles discovery of Indian researcher September 23rd, 2014

IEEE International Electron Devices Meeting To Celebrate 60th Anniversary as The Leading Technical Conference for Advanced Semiconductor Devices September 18th, 2014

Biosensors Get a Boost from Graphene Partnership: $5 Million Investment Supports Dozens of Jobs and Development of 300mm Fabrication Process and Wafer Transfer Facility September 18th, 2014

Nanoelectronics

$18-million NSF investment aims to take flat materials to new heights: 2-D alternatives to graphene may enable exciting advances in electronics, photonics, sensors and other applications October 1st, 2014

Breakthrough in ALD-graphene by Picosun technology October 1st, 2014

Grenoble Hosting SEMICON Europa Oct. 7-9, First Time Event Held in France: Leti’s 90-square-meter Booth Will Feature Portable Showroom To Demonstrate New Technology Innovations September 24th, 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

Discoveries

Multifunctional Cotton Fabrics Produced in Iran Using Nanotechnology October 2nd, 2014

Platinum meets its match in quantum dots from coal: Rice University's cheap hybrid outperforms rare metal as fuel-cell catalyst October 1st, 2014

Stressed Out: Research Sheds New Light on Why Rechargeable Batteries Fail October 1st, 2014

New Absorber Will Lead to Better Biosensor: Biosensors are more sensitive and able to detect smaller changes in the environment October 1st, 2014

Announcements

Lifeboat Foundation Responds to Largest Ebola Outbreak in History October 2nd, 2014

Iran's Sharif University to Host 4th Conference on Nanostructured Solar Cells October 2nd, 2014

Multifunctional Cotton Fabrics Produced in Iran Using Nanotechnology October 2nd, 2014

Graphene chips are close to significant commercialization October 1st, 2014

Battery Technology/Capacitors/Generators/Piezoelectrics/Thermoelectrics

Stressed Out: Research Sheds New Light on Why Rechargeable Batteries Fail October 1st, 2014

Graphene and Amaranthus Superparamagnets: Breakthrough nanoparticles discovery of Indian researcher September 23rd, 2014

IEEE International Electron Devices Meeting To Celebrate 60th Anniversary as The Leading Technical Conference for Advanced Semiconductor Devices September 18th, 2014

Toward making lithium-sulfur batteries a commercial reality for a bigger energy punch September 17th, 2014

Photonics/Optics/Lasers

$18-million NSF investment aims to take flat materials to new heights: 2-D alternatives to graphene may enable exciting advances in electronics, photonics, sensors and other applications October 1st, 2014

New Absorber Will Lead to Better Biosensor: Biosensors are more sensitive and able to detect smaller changes in the environment October 1st, 2014

Speed at its limits September 30th, 2014

'Pixel' engineered electronics have growth potential: Rice, Oak Ridge, Vanderbilt, Penn scientists lead creation of atom-scale semiconducting composites September 29th, 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