Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

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

Iranian Researchers Present New Model to Strengthen Superconductivity at Higher Temperatures April 19th, 2014

Iranian Researchers Produce New Anti-Cancer Drug from Turmeric April 19th, 2014

'Exotic' material is like a switch when super thin April 18th, 2014

Innovative strategy to facilitate organ repair April 18th, 2014

Display technology/LEDs/SS Lighting/OLEDs

Transparent Conductive Films and Sensors Are Hot Segments in Printed Electronics: Start-ups in these fields show above-average momentum, while companies working on emissive displays such as OLED are fading, Lux Research says April 17th, 2014

PAM-XIAMEN Offers UV LED wafer April 15th, 2014

Better solar cells, better LED light and vast optical possibilities April 12th, 2014

Printed Electronics Europe - Plastic Logic shows a flexible OLED display for wearable devices April 11th, 2014

Thin films

Transparent Conductive Films and Sensors Are Hot Segments in Printed Electronics: Start-ups in these fields show above-average momentum, while companies working on emissive displays such as OLED are fading, Lux Research says April 17th, 2014

Govt.-Legislation/Regulation/Funding/Policy

'Exotic' material is like a switch when super thin April 18th, 2014

Innovative strategy to facilitate organ repair April 18th, 2014

Novel stapled peptide nanoparticle combination prevents RSV infection, study finds April 17th, 2014

INSCX™ exchange to present Exchange trade reporting mechanism for engineered nanomaterials (NMs) to UK regulation agencies, insurers and upstream/downstream users April 17th, 2014

Nanotubes/Buckyballs

Effects of Carbon Nanotubes Studied on Pregnant Mothers April 12th, 2014

Nanotech Business Review 2013-2014 April 9th, 2014

Scientists Succeed in Simultaneous Determination of Acetaminophen, Codeine in Drug Samples April 9th, 2014

Rebar technique strengthens case for graphene: Rice University lab makes hybrid nanotube-graphene material that promises to simplify manufacturing April 7th, 2014

Discoveries

Iranian Researchers Present New Model to Strengthen Superconductivity at Higher Temperatures April 19th, 2014

Iranian Researchers Produce New Anti-Cancer Drug from Turmeric April 19th, 2014

'Exotic' material is like a switch when super thin April 18th, 2014

Innovative strategy to facilitate organ repair April 18th, 2014

Announcements

Iranian Researchers Present New Model to Strengthen Superconductivity at Higher Temperatures April 19th, 2014

Iranian Researchers Produce New Anti-Cancer Drug from Turmeric April 19th, 2014

'Exotic' material is like a switch when super thin April 18th, 2014

Innovative strategy to facilitate organ repair April 18th, 2014

Military

'Exotic' material is like a switch when super thin April 18th, 2014

Tiny particles could help verify goods: Chemical engineers hope smartphone-readable microparticles could crack down on counterfeiting April 15th, 2014

Targeting cancer with a triple threat: MIT chemists design nanoparticles that can deliver three cancer drugs at a time April 15th, 2014

Scalable CVD process for making 2-D molybdenum diselenide: Rice, NTU scientists unveil CVD production for coveted 2-D semiconductor April 8th, 2014

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

Energy Research Facility Construction Project at Brookhaven Lab Wins U.S. Energy Secretary's Achievement Award April 16th, 2014

IDTechEx Printed Electronics Europe 2014 Award Winners April 1st, 2014

Dais Analytic Wins SBIR Grant: Dais Analytic Receives US Army Small Business Innovation Research Grant to Further Its Demonstrated Successes in Cleaning Most Forms of Wastewater March 28th, 2014

Scientists develop world’s first light-activated antimicrobial surface that also works in the dark March 24th, 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