Featured Research

from universities, journals, and other organizations

Shear stiffness and friction mechanics of single-layer graphene measured for the first time

Date:
February 14, 2012
Source:
University of Bristol
Summary:
Researchers have measured and identified for the first time the stress and strain shear modulus and internal friction of graphene sheets.

Graphene is an atomic-scale honeycomb lattice made of carbon atoms.
Credit: Alexander Alus

Graphene is a material that has many potential groundbreaking uses in the electronics and composites industry.

Researchers from the University of Bristol have measured and identified for the first time the stress and strain shear modulus and internal friction of graphene sheets.

The research, in collaboration with the US Office of Naval Research, is published in Nano Letters.

Graphene is made up of a single layer of carbon atoms arranged in a hexagonal lattice. It is a promising material for the production of next-generation displays or solar cells because it is flexible, transparent and conductive.

For graphene to be used as nanoelectromechanical resonators or nanosensors, it is essential to know its structural behaviour and limitations as a mechanical material.

Fabrizio Scarpa, Professor of Smart Materials and Structures in the University of Bristol's Advanced Composites Centre for Innovation and Science (ACCIS), said: "To improve the design of graphene nanosensors it is important to understand the mechanical behaviour and the natural intrinsic damping and internal friction of graphene. Our findings indicate that graphene produced using chemical vapor deposition could be a vital alternative for nanomechanical sensor applications."

The researchers, using a technique called chemical vapour deposition (CVD), grew graphene films on copper foil in a quartz tube furnace at 1030 oC using a mixture of methane and hydrogen.

The research established some of the elastic properties of CVD-grown, single-layer graphene films on copper. The results revealed a striking difference between single- and multilayered graphene films in both shear modulus and internal friction. This difference may be due to the transition of the shear restoring force from chemical bonding within a layer to interlayer interactions.

The average shear modulus of the films studied compared well with most of the theoretical calculations based on single-layer pristine graphene structures. The high shear modulus and low internal friction point to a low defect density structure approaching that of the pristine graphene.

The findings suggest the use of CVD material in nanomechanical sensor applications could be a vital alternative.


Story Source:

The above story is based on materials provided by University of Bristol. Note: Materials may be edited for content and length.


Journal Reference:

  1. Xiao Liu, Thomas H. Metcalf, Jeremy T. Robinson, Brian H. Houston, Fabrizio Scarpa. Shear Modulus of Monolayer Graphene Prepared by Chemical Vapor Deposition. Nano Letters, 2012; 12 (2): 1013 DOI: 10.1021/nl204196v

Cite This Page:

University of Bristol. "Shear stiffness and friction mechanics of single-layer graphene measured for the first time." ScienceDaily. ScienceDaily, 14 February 2012. <www.sciencedaily.com/releases/2012/02/120214121848.htm>.
University of Bristol. (2012, February 14). Shear stiffness and friction mechanics of single-layer graphene measured for the first time. ScienceDaily. Retrieved July 28, 2014 from www.sciencedaily.com/releases/2012/02/120214121848.htm
University of Bristol. "Shear stiffness and friction mechanics of single-layer graphene measured for the first time." ScienceDaily. www.sciencedaily.com/releases/2012/02/120214121848.htm (accessed July 28, 2014).

Share This




More Matter & Energy News

Monday, July 28, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Europe's Highest Train Turns 80 in French Pyrenees

Europe's Highest Train Turns 80 in French Pyrenees

AFP (July 25, 2014) Europe's highest train, the little train of Artouste in the French Pyrenees, celebrates its 80th birthday. Duration: 01:05 Video provided by AFP
Powered by NewsLook.com
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

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