Featured Research

from universities, journals, and other organizations

Rebar technique strengthens case for graphene: Hybrid nanotube-graphene material promises to simplify manufacturing

Date:
April 7, 2014
Source:
Rice University
Summary:
Carbon nanotubes become reinforcing bars that make two-dimensional graphene much easier to handle in a hybrid material. Chemists set nanotubes into graphene in a way that not only mimics how steel rebar is used in concrete but also preserves and even improves the electrical and mechanical qualities of both. The technique should make large, flexible, conductive and transparent sheets of graphene much easier to manipulate, which should be of interest to electronics manufacturers.

Nanotubes with added carbon side chains are spin coated onto a substrate and heated to form rebar graphene in a process invented at Rice University. The rebars add strength and electrical connectivity to the transparent, flexible sheet that could replace more expensive materials in displays and solar cells.
Credit: Tour Group/Rice University

Carbon nanotubes are reinforcing bars that make two-dimensional graphene much easier to handle in a new hybrid material grown by researchers at Rice University.

The Rice lab of chemist James Tour set nanotubes into graphene in a way that not only mimics how steel rebar is used in concrete but also preserves and even improves the electrical and mechanical qualities of both.

The technique should make large, flexible, conductive and transparent sheets of graphene much easier to manipulate, which should be of interest to electronics manufacturers, Tour said. He suggested the new hybrid could, upon stacking in a few layers, be a cost-effective replacement for expensive indium tin oxide (ITO) now used in displays and solar cells.

The research appears this month in the American Chemical Society journal ACS Nano.

Graphene, a single-layer matrix of carbon atoms, may be one of the strongest materials on the planet, but it can be a challenge to lift the tiny sheets from the catalyst substrate on which they're grown, generally by chemical vapor deposition (CVD), Tour said.

"Normally you grow graphene on a metal, but you can't just dissolve away the metal," Tour said. "You put a polymer on top of the graphene to reinforce it, and then dissolve the metal.

"Then you have polymer stuck to the graphene. When you dissolve the polymer, you're left with residues, trace impurities that limit graphene's effectiveness for high-speed electronics and biological devices. By taking away the polymer support step, we greatly expand the potential for this material."

To create what they call rebar graphene, the researchers simply spin-coat and then heat and cool functionalized single- or multiwalled carbon nanotubes on copper foils, using the nanotubes themselves as the carbon source. When heated, the functional carbon groups decompose and form graphene, while the nanotubes partially split and form covalent junctions with the new graphene layer.

"The nanotubes actually become one with the material in certain places," Tour said. "It's a true hybrid with in-plane nanotubes covalently bonded to graphene."

The interconnected, embedded nanotubes strengthen the graphene, Tour said. "We can see in our images how well the nanotubes bear the load. When we stretch the material, the tubes get thinner," he said. Because the electron microscope images let them determine the nanotubes' chirality -- the angles of the hexagons that make up the tube -- the researchers were able to calculate the tubes' diameters and know precisely how much thinner they get under tension.

The networked nanotubes also make the material a better conductor than standard CVD-grown graphene, Tour said. Graphene as grown is never a perfect matrix of hexagons; instead, it consists of crystals that grow separately and connect at grain boundaries that disrupt the flow of electrons. The nanotubes in rebar graphene effectively bridge those boundaries.

"The big thing for industry is to see if they can get graphene to substitute for ITO for transparent displays," Tour said. "But ITO is rigid, and it breaks when you drop your smartphone, for example. Graphene and nanotubes, on the other hand, would afford flexible displays. We showed in our tests that rebar graphene has better conductivity than normal graphene at the same transparency, and with layering, it could be ITO-competitive."

The Office of Naval Research Multidisciplinary University Research Initiative (MURI), the Air Force Office of Scientific Research and its MURI program, the National Center for Research Resources and Health Disparities of the National Institutes of Health and the National Science Foundation supported the research.


Story Source:

The above story is based on materials provided by Rice University. The original article was written by Mike Williams. Note: Materials may be edited for content and length.


Journal Reference:

  1. Zheng Yan, Zhiwei Peng, Gilberto Casillas, Jian Lin, Changsheng Xiang, Haiqing Zhou, Yang Yang, Gedeng Ruan, Abdul-Rahman O. Raji, Errol L. G. Samuel, Robert H. Hauge, Miguel Jose Yacaman, James M. Tour. Rebar Graphene. ACS Nano, 2014; 140402145529003 DOI: 10.1021/nn501132n#sthash.WppbV65B.dpuf

Cite This Page:

Rice University. "Rebar technique strengthens case for graphene: Hybrid nanotube-graphene material promises to simplify manufacturing." ScienceDaily. ScienceDaily, 7 April 2014. <www.sciencedaily.com/releases/2014/04/140407131021.htm>.
Rice University. (2014, April 7). Rebar technique strengthens case for graphene: Hybrid nanotube-graphene material promises to simplify manufacturing. ScienceDaily. Retrieved July 25, 2014 from www.sciencedaily.com/releases/2014/04/140407131021.htm
Rice University. "Rebar technique strengthens case for graphene: Hybrid nanotube-graphene material promises to simplify manufacturing." ScienceDaily. www.sciencedaily.com/releases/2014/04/140407131021.htm (accessed July 25, 2014).

Share This




More Matter & Energy News

Friday, July 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

TSA Administrator on Politics and Flight Bans

TSA Administrator on Politics and Flight Bans

AP (July 24, 2014) TSA administrator, John Pistole's took part in the Aspen Security Forum 2014, where he answered questions on lifting of the ban on flights into Israel's Tel Aviv airport and whether politics played a role in lifting the ban. (July 24) Video provided by AP
Powered by NewsLook.com
Creative Makeovers for Ugly Cellphone Towers

Creative Makeovers for Ugly Cellphone Towers

AP (July 24, 2014) Mobile phone companies and communities across the country are going to new lengths to disguise those unsightly cellphone towers. From a church bell tower to a flagpole, even a pencil, some towers are trying to make a point. (July 24) Video provided by AP
Powered by NewsLook.com
Algonquin Power Goes Activist on Its Target Gas Natural

Algonquin Power Goes Activist on Its Target Gas Natural

TheStreet (July 23, 2014) When The Deal's Amanda Levin exclusively reported that Gas Natural had been talking to potential suitors, the Ohio company responded with a flat denial, claiming its board had not talked to anyone about a possible sale. Lo and behold, Canadian utility Algonquin Power and Utilities not only had approached the company, but it did it three times. Its last offer was for $13 per share as Gas Natural's was trading at a 60-day moving average of about $12.50 per share. Now Algonquin, which has a 4.9% stake in Gas Natural, has taken its case to shareholders, calling on them to back its proposals or, possibly, a change in the target's board. Video provided by TheStreet
Powered by NewsLook.com
Robot Parking Valet Creates Stress-Free Travel

Robot Parking Valet Creates Stress-Free Travel

AP (July 23, 2014) 'Ray' the robotic parking valet at Dusseldorf Airport in Germany lets travelers to avoid the hassle of finding a parking spot before heading to the check-in desk. (July 23) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

    Health News

      Environment News

        Technology News



          Save/Print:
          Share:

          Free Subscriptions


          Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

          Get Social & Mobile


          Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

          Have Feedback?


          Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
          Mobile: iPhone Android Web
          Follow: Facebook Twitter Google+
          Subscribe: RSS Feeds Email Newsletters
          Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins