Navigation Links
Defect in graphene may present bouquet of possibilities
Date:5/25/2011

A class of decorative, flower-like defects in the nanomaterial graphene could have potentially important effects on the material's already unique electrical and mechanical properties, according to researchers at the National Institute of Standards and Technology (NIST) and Georgia Tech. In a new paper,* the team for the first time describes a family of seven defects that could occur naturally or be induced to occur in graphene, one of which already has been observed.

Graphene is renowned for its strength and conductivity, both of which are a result of its structure. For the most part, graphene is a featureless plane of carbon atoms arranged in a honeycomb lattice.

According to NIST Fellow Joseph Stroscio, defects can appear due to the movement of the carbon atoms at high temperatures when producing graphene by heating silicon carbide under ultrahigh vacuum. The easiest, i.e. requiring the least amount of energy, rearrangements graphene can make are to switch from six-member carbon rings to rings containing five or seven atoms, which keeps all the carbon atoms happy with no unsatisfied bonds. The NIST researchers have discovered that stringing five and seven member rings together in closed loops creates a new type of defect or grain boundary loop in the honeycomb lattice.

According to NIST researcher Eric Cockayne, the fabrication process plays a big role in creating these defects.

"As the graphene forms under high heat, sections of the lattice can come loose and rotate," Cockayne says. "As the graphene cools, these rotated sections link back up with the lattice, but in an irregular way. It's almost as if patches of the graphene were cut out with scissors, turned clockwise, and made to fit back into the same place, only it really doesn't fit, which is why we get these flowers."

The exceedingly rigid lattice already is stronger than steel, but the defects might allow it a little flexibility, making it even more resilient to tearing or fracturing.

With more experimentation, Cockayne says, researchers should be able to correlate the appearance of defects with variations in growth conditions, which should make it possible to either avoid defects entirely or produce them at will.

Moreover, while the flower defect is composed of six pairs of five- and seven-atom rings, Cockayne and the NIST team's modeling of graphene's atomic structure suggests there might be a veritable bouquet of flower-like configurations. These configurationsseven in allwould each possess their own unique mechanical and electrical properties.


'/>"/>

Contact: Mark Esser
mark.esser@nist.gov
301-975-8735
National Institute of Standards and Technology (NIST)
Source:Eurekalert  

Related biology technology :

1. Model Predicts a Drugs Likelihood of Causing Birth Defects
2. Graphenes strength lies in its defects
3. Supreme Court Amicus Brief Filed Opposing Lawsuit Protection for Manufacturers of Defectively Designed Vaccines
4. Repligen Files Investigational New Drug Application with FDA for First Drug Targeting the Core Genetic Defect of Friedreichs Ataxia
5. Watching crystals grow provides clues to making smoother, defect-free thin films
6. Nanotube defects equal better energy and storage systems
7. Asbestos, Pharmaceutical Liability, Construction Defects, Nanotech: Covered by Targeted CLE Teleconferences
8. Worlds First Low Radiocarbon Food May Reduce Risks of Cancer and Birth Defects, and Possibly Even Slow the Aging Process
9. Cardica Receives $1 Million Milestone Payment From Cook Medical for Development of Heart Defect Closure Device
10. Activated graphene makes superior supercapacitors for energy storage
11. Why graphene holds the key to the future
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Defect in graphene may present bouquet of possibilities
(Date:2/5/2016)... , Feb. 5, 2016 Australian-US drug discovery and ... today the appointment of a new Chairman, Mr John ... , effective immediately. James Garner , has ... Director and former Acting CEO, Mr Iain Ross , ... Director. --> James Garner , has also been ...
(Date:2/4/2016)... , ... February 04, 2016 , ... ... GC-MS and triple quad LC-MS, host live demos and poster sessions, and present ... and exhibition. The conference takes place March 6 to 10 at the Georgia ...
(Date:2/4/2016)... VANCOUVER, British Columbia and MENLO PARK, ... Inc. (OTCQX: DMPI) ("DelMar" and the "Company"), a biopharmaceutical ... therapies, today announced that it will present at the ... on Monday, February 8, 2016 at 10:00 a.m. EST in ... Jeffrey Bacha , DelMar,s president and CEO, will provide an ...
(Date:2/4/2016)... 4, 2016 Sinovac Biotech Ltd. ("Sinovac" or ... of biopharmaceutical products in China , ... of directors received on February 4, 2016 a preliminary ... consortium comprised of PKU V-Ming ( Shanghai ... CICC Qianhai Development ( Shenzhen ) Fund ...
Breaking Biology Technology:
(Date:1/13/2016)... ALBANY, New York , January 13, 2016 /PRNewswire/ ... Transparency Market Research has published a new market report ... Share, Growth, Trends, and Forecast, 2015 - 2023. According to ... mn in 2014 and is anticipated to reach US$1,625.8 ... from 2015 to 2023. In terms of volume, the ...
(Date:1/11/2016)... , Jan. 11, 2016 Synaptics Incorporated (NASDAQ: ... solutions, today announced that its ClearPad ® TouchView ... products won two separate categories in the 8 th ... and Best Technology Breakthrough. The Synaptics ® TDDI ... simplified supply chain, thinner devices, brighter displays and borderless ...
(Date:1/8/2016)... MANCHESTER, United Kingdom , Jan. 8, 2016 /PRNewswire/ ... sensor-based diagnostic products, today announced the closing of a $9 ... investors.  Proceeds from the financing will be used to accelerate ... device for detecting early-stage pressure ulcers. ... after receiving CE Mark approval. The device,s introduction has been ...
Breaking Biology News(10 mins):