Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Harvard scientists bend nanowires into 2-D and 3-D structures

This is a false-color scanning electron microscope image of the zigzag nanowires in which the straight sections are separated by triangular joints and specific device functions are precisely localized at the kinked junctions in the nanowires.

Credit: Bozhi Tian, Lieber Group, Harvard University
This is a false-color scanning electron microscope image of the zigzag nanowires in which the straight sections are separated by triangular joints and specific device functions are precisely localized at the kinked junctions in the nanowires. Credit: Bozhi Tian, Lieber Group, Harvard University

Abstract:
New 'stereocenters' introduce triangular joints into otherwise linear nanomaterials

Harvard scientists bend nanowires into 2-D and 3-D structures

Cambridge, MA | Posted on October 21st, 2009

Taking nanomaterials to a new level of structural complexity, scientists have determined how to introduce kinks into arrow-straight nanowires, transforming them into zigzagging two- and three-dimensional structures with correspondingly advanced functions.

The work is described this week in the journal Nature Nanotechnology by Harvard University researchers led by Bozhi Tian and Charles M. Lieber.

Among other possible applications, the authors say, the new technology could foster a new nanoscale approach to detecting electrical currents in cells and tissues.

"We are very excited about the prospects this research opens up for nanotechnology," says Lieber, Mark Hyman, Jr. Professor of Chemistry in Harvard's Faculty of Arts and Sciences. "For example, our nanostructures make possible integration of active devices in nanoelectronic and photonic circuits, as well as totally new approaches for extra- and intracellular biological sensors. This latter area is one where we already have exciting new results, and one we believe can change the way much electrical recording in biology and medicine is carried out."

Lieber and Tian's approach involves the controlled introduction of triangular "stereocenters" -- essentially, fixed 120º joints -- into nanowires, structures that have previously been rigidly linear. These stereocenters, analogous to the chemical hubs found in many complex organic molecules, introduce kinks into 1-D nanostructures, transforming them into more complex forms.

The researchers were able to introduce stereocenters as nanowires self-assembled. They halted growth of the 1-D nanostructures for 15 seconds by removing key gaseous reactants from the chemical brew in which the process was taking place, replacing these reactants after joints had been introduced into the nanostructures. This approach resulted in a 40 percent yield of bent nanowires, which can then be purified to achieve higher yields.

"The stereocenters appear as 'kinks,' and the distance between kinks is completely controlled," says Tian, a research assistant in Harvard's Department of Chemistry and Chemical Biology. "Moreover, we demonstrated the generality of our approach through synthesis of 2-D silicon, germanium, and cadmium sulfide nanowire structures."

The research by Lieber and Tian is the latest in a years-long effort by scientists to control the composition and structure of nanowires during synthesis. Despite advances in these areas, the ability to control the design and growth of self-assembling nanostructures has been limited.

Lieber and Tian's work takes the formation of 2-D nanostructures a step further by enabling the introduction of electronic devices at the stereocenters.

"An important concept that emerged from these studies is that of introducing functionality at defined nanoscale points for the first time -- in other words, nanodevices that can 'self-label,'" Lieber says. "We illustrated this novel capability by the insertion of p-n diodes and field-effect transistors precisely at the stereocenters."

Such self-labeled structures could open up the possibility of introducing nanoelectronics, photodetectors, or biological sensors into complex nanoscale structures.

Lieber and Tian's co-authors are Ping Xie and Thomas J. Kempa of Harvard's Department of Chemistry and Chemical Biology and David C. Bell of Harvard's Center for Nanoscale Systems. Their work was funded by the National Institutes of Health, the McKnight Foundation, the MITRE Corporation, and the National Science Foundation.

####

About Harvard University
The name Harvard comes from the college’s first benefactor, the young minister John Harvard of Charlestown. Upon his death in 1638, he left half his estate to the institution established in 1636 by vote of the Great and General Court of the Massachusetts Bay Colony.

For more information, please click here

Contacts:
Steve Bradt

617-496-8070

Copyright © Eurekalert

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

Yale researchers’ technology turns wasted heat into power June 27th, 2016

FEI Launches Helios G4 DualBeam Series for Materials Science: The Helios G4 DualBeam Series features new capabilities to enable scientists and engineers to answer the most demanding and challenging scientific questions June 27th, 2016

Russian physicists create a high-precision 'quantum ruler': Physicists have devised a method for creating a special quantum entangled state June 25th, 2016

Nanoscientists develop the 'ultimate discovery tool': Rapid discovery power is similar to what gene chips offer biology June 25th, 2016

Possible Futures

Yale researchers’ technology turns wasted heat into power June 27th, 2016

Superheroes are real: Ultrasensitive nonlinear metamaterials for data transfer June 25th, 2016

Russian physicists create a high-precision 'quantum ruler': Physicists have devised a method for creating a special quantum entangled state June 25th, 2016

Nanoscientists develop the 'ultimate discovery tool': Rapid discovery power is similar to what gene chips offer biology June 25th, 2016

Self Assembly

Self-assembling icosahedral protein designed: Self-assembling icosahedral protein designed June 22nd, 2016

DNA shaping up to be ideal framework for rationally designed nanostructures: Shaped DNA frames that precisely link nanoparticles into different structures offer a platform for designing functional nanomaterials June 14th, 2016

Automating DNA origami opens door to many new uses: Like 3-D printing did for larger objects, method makes it easy to build nanoparticles out of DNA May 30th, 2016

Searching for a nanotech self-organizing principle May 1st, 2016

Nanomedicine

Nanoscientists develop the 'ultimate discovery tool': Rapid discovery power is similar to what gene chips offer biology June 25th, 2016

Nanotechnology and math deliver two-in-one punch for cancer therapy resistance June 24th, 2016

Self-assembling icosahedral protein designed: Self-assembling icosahedral protein designed June 22nd, 2016

Stealth nanocapsules kill Chagas parasites in mouse models June 22nd, 2016

Sensors

Researchers discover new chemical sensing technique: Technique allows sharper detail -- and more information -- with near infrared light June 24th, 2016

Artificial synapse rivals biological ones in energy consumption June 21st, 2016

A new form of hybrid photodetectors with quantum dots and graphene June 19th, 2016

Drum beats from a one atom thick graphite membrane June 15th, 2016

Nanoelectronics

Soft decoupling of organic molecules on metal June 23rd, 2016

Tailored DNA shifts electrons into the 'fast lane': DNA nanowire improved by altering sequences June 22nd, 2016

Scientists engineer tunable DNA for electronics applications June 21st, 2016

Novel energy inside a microcircuit chip: VTT developed an efficient nanomaterial-based integrated energy June 10th, 2016

Announcements

Yale researchers’ technology turns wasted heat into power June 27th, 2016

FEI Launches Helios G4 DualBeam Series for Materials Science: The Helios G4 DualBeam Series features new capabilities to enable scientists and engineers to answer the most demanding and challenging scientific questions June 27th, 2016

Russian physicists create a high-precision 'quantum ruler': Physicists have devised a method for creating a special quantum entangled state June 25th, 2016

Nanoscientists develop the 'ultimate discovery tool': Rapid discovery power is similar to what gene chips offer biology June 25th, 2016

Nanobiotechnology

Nanotechnology and math deliver two-in-one punch for cancer therapy resistance June 24th, 2016

Tailored DNA shifts electrons into the 'fast lane': DNA nanowire improved by altering sequences June 22nd, 2016

Self-assembling icosahedral protein designed: Self-assembling icosahedral protein designed June 22nd, 2016

Stealth nanocapsules kill Chagas parasites in mouse models June 22nd, 2016

Photonics/Optics/Lasers

Superheroes are real: Ultrasensitive nonlinear metamaterials for data transfer June 25th, 2016

Russian physicists create a high-precision 'quantum ruler': Physicists have devised a method for creating a special quantum entangled state June 25th, 2016

Marrying superconductors, lasers, and Bose-Einstein condensates: Chapman University Institute for Quantum Studies (IQS) member Yutaka Shikano, Ph.D., recently had research published in Scientific Reports June 20th, 2016

A new trick for controlling emission direction in microlasers June 20th, 2016

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







Car Brands
Buy website traffic