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:4/27/2016)... ... ... Cambridge Semantics, the leading provider of Smart Data analytic and data management ... The Silicon Review’s “20 Fastest Growing Big Data Companies of 2016.” , “From ... end users facing some of the most complex data challenges in the industry,” said ...
(Date:4/27/2016)... NY (PRWEB) , ... April 27, 2016 , ... ... it. Touch screen mobile devices with fingerprint recognition for secure access, voice ... are only a few ways consumers are interacting with biometrics technology today. ...
(Date:4/27/2016)... Virgin Islands (PRWEB) , ... April 27, 2016 ... ... Company Ltd. (d/b/a Biohaven) is pleased to announce the appointment of John Tilton as ... was an Executive Director and one of the founding commercial leaders responsible for ...
(Date:4/27/2016)... ... April 27, 2016 , ... A compact PET scanner ... and MRI (Magnetic Resonance Imaging) in existing third-party MRI systems. PET and MRI ... small animal subjects. Simultaneous PET/MRI imaging offers a solution to many challenges that ...
Breaking Biology Technology:
(Date:4/13/2016)... 2016  IMPOWER physicians supporting Medicaid patients in ... clinical standard in telehealth thanks to a new partnership ... platform, IMPOWER patients can routinely track key health measurements, ... index, and, when they opt in, share them with ... a local retail location at no cost. By leveraging ...
(Date:3/31/2016)... , March 31, 2016  Genomics firm Nabsys has ... CEO, Barrett Bready , M.D., who returned to ... the original technical leadership team, including Chief Technology Officer, ... Product Development, Steve Nurnberg and Vice President of Software ... the company. Dr. Bready served as CEO ...
(Date:3/23/2016)... , March 23, 2016 ... Interesse erhöhter Sicherheit Gesichts- und Stimmerkennung mit ... Inc. (NASDAQ: MESG ), ein ... dass das Unternehmen mit SpeechPro zusammenarbeitet, um ... der Finanzdienstleistungsbranche, wird die Möglichkeit angeboten, im ...
Breaking Biology News(10 mins):