Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Researchers Devise New Means For Creating Elastic Conductors

25.01.2012
Researchers from North Carolina State University have developed a new method for creating elastic conductors made of carbon nanotubes, which will contribute to large-scale production of the material for use in a new generation of elastic electronic devices.

“We’re optimistic that this new approach could lead to large-scale production of stretchable conductors, which would then expedite research and development of elastic electronic devices,” says Dr. Yong Zhu, an assistant professor of mechanical and aerospace engineering at NC State, and lead author of a paper describing the new technique.


The buckled nanotubes look like squiggly lines on a flat surface.

The buckled nanotubes look like squiggly lines on a flat surface.
Stretchable electronic devices would be both more resilient and able to conform to various shapes. Potential applications include devices that can be incorporated into clothing, implantable medical devices, and sensors that can be stretched over unmanned aerial vehicles.

To develop these stretchable electronics, one needs to create conductors that are elastic and will reliably transmit electric signals regardless of whether they are being stretched.

One way of making conductive materials more elastic is to “buckle” them. Zhu’s new method buckles carbon nanotubes on the plane of the substrate. Think of the nanotubes as forming squiggly lines on a piece of paper, rather than an accordion shape that zigs up and down with only the bottom parts touching the sheet of paper. Zhu’s team used carbon nanotubes because they are sturdy, stable, excellent conductors and can be aligned into ribbons.

The new process begins by placing aligned carbon nanotubes on an elastic substrate using a transfer printing process. The substrate is then stretched, which separates the nanotubes while maintaining their parallel alignment.

Strikingly, when the substrate is relaxed, the nanotubes do not return to their original positions. Instead, the nanotubes buckle – creating what looks like a collection of parallel squiggly lines on a flat surface.

The carbon nanotubes are now elastic – they can be stretched – but they have retained their electrical properties.

The key benefit of this new method is that it will make manufacturing of elastic conductors significantly more efficient, because the carbon nanotubes can be applied before the substrate is stretched. This is compatible with existing manufacturing processes. “For example, roll-to-roll printing techniques could be adapted to take advantage of our new method,” Zhu says.

A paper describing the new approach, “Buckling of Aligned Carbon Nanotubes as Stretchable Conductors: A New Manufacturing Strategy,” was published online Jan. 23 in Advanced Materials. The paper was co-authored by Feng Xu, a Ph.D. student at NC State. The research was funded by the National Science Foundation.

In another new paper, Zhu’s team has demonstrated for the first time that carbon nanotubes can be buckled using a technique in which the elastic substrate is stretched before the nanotubes are applied. The substrate is then relaxed, forcing the nanotubes to buckle out of plane. The nanotubes form a ribbon that curves up and down like the bellows of an accordion. This second technique has been used before with other materials. This second paper, “Wavy Ribbons of Carbon Nanotubes for Stretchable Conductors,” was published Jan. 19 in Advanced Functional Materials.

Matt Shipman | EurekAlert!
Further information:
http://www.ncsu.edu
http://news.ncsu.edu/releases/wmszhuconductors/

More articles from Materials Sciences:

nachricht Researchers devise microreactor to study formation of methane hydrate
23.08.2017 | NYU Tandon School of Engineering

nachricht Meter-sized single-crystal graphene growth becomes possible
22.08.2017 | Science China Press

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Fizzy soda water could be key to clean manufacture of flat wonder material: Graphene

Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.

As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

What the world's tiniest 'monster truck' reveals

23.08.2017 | Life Sciences

Treating arthritis with algae

23.08.2017 | Life Sciences

Witnessing turbulent motion in the atmosphere of a distant star

23.08.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>