Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Totally tubular films show promise for touchscreens: Rice University lab creates simple method for flexible, conductive carbon nanotube sheets

A thin film of pure carbon nanotubes produced at Rice Universityshows promise as a component of flexible, transparent touchscreens. (Credit: Pasquali Lab/Rice University)
A thin film of pure carbon nanotubes produced at Rice Universityshows promise as a component of flexible, transparent touchscreens.

(Credit: Pasquali Lab/Rice University)

Abstract:
A Rice University team has hit upon a method to produce nearly transparent films of electrically conductive carbon nanotubes, a goal sought by researchers around the world.

Totally tubular films show promise for touchscreens: Rice University lab creates simple method for flexible, conductive carbon nanotube sheets

Houston, TX | Posted on October 29th, 2012

The lab of Rice researcher Matteo Pasquali found that slides dipped into a solution of pure nanotubes in chlorosulfonic acid (CSA) left them with an even coat of nanotubes that, after further processing, had none of the disadvantages seen with other methods.

The films may be suitable for flexible electronic displays and touchscreens, according to the paper published this month in the American Chemical Society journal ACS Nano.

"I think this could be the way that high-performance transparent electrodes are made in the future," said Pasquali, a professor of chemical and biomolecular engineering and of chemistry. "The solution is straightforward. It's a very simple process."

The method is scalable to high-throughput processes like slot, slide and roll coating used by industry, Pasquali said.

A frustrating characteristic of nanotubes, particularly long ones, is that they attract each other in common solvents, making it a challenge to disperse them. Long nanotubes are believed to be the key to high-performance films.

Researchers have tried other ways to keep them from aggregating, Pasquali said. Functionalizing nanotubes - dressing them with chemicals - can make them less attractive to each other, but it degrades their desirable electrical properties. Combinations of surfactants and sonication have also been tried, but the nanotubes breakduring sonication, and the surfactant leaves a residue that cannot be washed away, he said.

These methods, combined with various means of mechanical coating, have been used to create nanotube films, but none with the level of quality achieved by the Pasquali lab. TheRice films, which are made of nanotubes thousands of times longer than they are wide, remain electrically stable after more than three months, said graduate student and lead author Francesca Mirri.

The nanotubes, literally, had to pass an acid test. "(CSA) is the acid we typically use in our lab, so the first thing we say when we get a new type of carbon nanotubes is, 'OK, let's put it in acid and see what happens,'" Mirri said. In previous research, Pasquali's lab had determined that CSA can dissolve high-quality nanotubes because the acid induces repulsive forces between the tubes that counterbalance the van der Waals force that draws them together.

Mirri and her colleagues produced films by combining single- or double-walled carbon nanotubes with CSA in various concentrations. They dipped glass slides into the nanotube solutions with a motorized arm to ensure even coating as the slides were steadily withdrawn.

They used chloroform to coagulate the acid and dry the slides, followed by a wash of diethyl ether. The researchers were surprised to find the chloroform did not disrupt the thin liquid layer. The result was a film several nanometers thick that provided the best tradeoff between transparency and sheet resistance, a measure of conductivity.

Mirri sees nanotube films as a viable alternative to indium tin oxide (ITO), the current standard conductive layer in transparent displays. "Everybody uses ITO for commercial applications, but the problem is it's a ceramic and really fragile," she said. "It's not good for flexible electronics, and also requires high temperature or vacuum processes to produce; that uses more energy and makes it more expensive.

"Our thin film for something like a cell phone would need very little material -- a few micrograms of nanotubes -- so it wouldn't be that expensive, but it would have similarproperties in transparency and conductivity to ITO," she said.

Co-authors are former postdoctoral researcher Anson Ma, now an assistant professor at the University of Connecticut; postdoctoral researchers Shannon Eichmann and Tienyi Theresa Hsu; former graduate student Natnael Behabtu, now a researcher at DuPont; graduate student Colin Young; and senior undergraduate Dmitri Tsentalovich, all of Rice.

The research was supported by the Air Force Office of Scientific Research, the Air Force Research Laboratories and the Robert A. Welch Foundation.

####

About Rice University
Located on a 300-acre forested campus in Houston, Rice University is consistently ranked among the nation's top 20 universities by U.S. News & World Report. Rice has highly respected schools of Architecture, Business, Continuing Studies, Engineering, Humanities, Music, Natural Sciences and Social Sciences and is home to the Baker Institute forPublic Policy. With 3,708 undergraduates and 2,374 graduate students, Rice's undergraduate student-to-faculty ratio is 6-to-1. Its residential college system builds close-knit communities and lifelong friendships, just one reason why Rice has been ranked No. 1 for best quality of life multiple times by the Princeton Review and No. 2 for "best value" among private universities by Kiplinger's Personal Finance. To read "What they're saying about Rice," go to tinyurl.com/AboutRice.

For more information, please click here

Contacts:
David Ruth
713-348-6327


Mike Williams
713-348-6728

Copyright © Rice University

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 Links

Read the abstract at:

Related News Press

News and information

The next step in DNA computing: GPS mapping? May 6th, 2015

Improving Clinical Care and Patient Quality of Life in Advanced Liver Disease, d-LIVER Workshop, Milan, 27 May 2015 May 6th, 2015

Grafoid Acquires MuAnalysis Inc; Expands Its Advanced Materials Testing Capabilities May 6th, 2015

Winner Announced for NNI’s First ‘EnvisioNano’ Nanotechnology Image Contest May 6th, 2015

Thin films

Improving organic transistors that drive flexible and conformable electronics: UMass Amherst scientists advance understanding of strain effects on performance May 5th, 2015

'Microcombing' creates stronger, more conductive carbon nanotube films May 5th, 2015

ORNL researchers probe chemistry, topography and mechanics with one instrument May 2nd, 2015

Unique microscopic images provide new insights into ionic liquids April 28th, 2015

New technique for exploring structural dynamics of nanoworld: Developed in a Nobel laureate's laboratory at Caltech, hybrid approach allows ultrafast EM analysis of materials, showing tiny electronic changes in individual atoms within a material on ultrafast time scales April 28th, 2015

Display technology/LEDs/SS Lighting/OLEDs

Desirable defects: A new meta-material based on colloids and liquid crystals April 30th, 2015

QD Vision Wins 2015 Bronze Edison Award for Color IQ™ Quantum Dot Technology April 26th, 2015

Govt.-Legislation/Regulation/Funding/Policy

Channeling valleytronics in graphene: Berkeley Lab researchers discover 1-D conducting channels in bilayer graphene May 6th, 2015

A better way to build DNA scaffolds: McGill researchers devise new technique to produce long, custom-designed DNA strands May 6th, 2015

Thermometer-like device could help diagnose heart attacks May 6th, 2015

Winner Announced for NNI’s First ‘EnvisioNano’ Nanotechnology Image Contest May 6th, 2015

Nanotubes/Buckyballs/Fullerenes

A better way to build DNA scaffolds: McGill researchers devise new technique to produce long, custom-designed DNA strands May 6th, 2015

'Microcombing' creates stronger, more conductive carbon nanotube films May 5th, 2015

Making robots more human April 29th, 2015

SouthWest NanoTechnologies CEO Dave Arthur to Speak at NanoBCA DC Roundtable on May 19 in Washington DC April 20th, 2015

Discoveries

Attosecond physics: A new gateway to the microcosmos May 6th, 2015

Channeling valleytronics in graphene: Berkeley Lab researchers discover 1-D conducting channels in bilayer graphene May 6th, 2015

A better way to build DNA scaffolds: McGill researchers devise new technique to produce long, custom-designed DNA strands May 6th, 2015

Thermometer-like device could help diagnose heart attacks May 6th, 2015

Announcements

The next step in DNA computing: GPS mapping? May 6th, 2015

Improving Clinical Care and Patient Quality of Life in Advanced Liver Disease, d-LIVER Workshop, Milan, 27 May 2015 May 6th, 2015

Grafoid Acquires MuAnalysis Inc; Expands Its Advanced Materials Testing Capabilities May 6th, 2015

Winner Announced for NNI’s First ‘EnvisioNano’ Nanotechnology Image Contest May 6th, 2015

Military

From brittle to plastic in 1 breath: Rice University theorists show environments can alter 2-D materials' basic properties May 4th, 2015

No Hogwarts invitation required: Invisibility cloaks move into the real-life classroom: A new solid-state device can demonstrate the physical principles of invisibility cloaks without special equipment or magic spells April 30th, 2015

Chemists strike nano-gold: 4 new atomic structures for gold nanoparticle clusters: Research builds upon work by Nobel Prize-winning team from Stanford University April 28th, 2015

Two-dimensional semiconductor comes clean April 27th, 2015

Grants/Awards/Scholarships/Gifts/Contests/Honors/Records

Winner Announced for NNI’s First ‘EnvisioNano’ Nanotechnology Image Contest May 6th, 2015

Oxford Instruments announces winners of the 2015 Sir Martin Wood Science Prize for China May 2nd, 2015

Rice University's Richards-Kortum, Vardi elected to National Academy of Sciences: Bioengineer, computer scientist join elite list of dual-academy members April 29th, 2015

Scientists join forces to reveal the mass and shape of single molecules April 27th, 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