Russian researchers have studied elastic properties of graphene

As of today, graphene, the thinnest one-atom-thick layer of carbon, is one of the most amazing materials. Measurements made in 2008 by researchers at Columbia University, proved that graphene was also the strongest and most elastic material among all known ones. However, the obtained data related to “ideal” graphene, which contains very few admixtures, its crystal structure being homogeneous. Apparently, defects in its structure should affect elastic properties and electronic features of the material.

Indeed, defects in structure have great impact on strength and electric properties of graphene. Researchers can learn to control the movement of these defects and, using them, “to sew together” carbon nanotubes or fullerenes. Such nanotubes or fullerenes connected to each other may be formed only owing to availability of defects, which possess sufficient mobility. Therefore, search for opportunities to connect such elements is the primary task in carbon electronics. For example, transistors running on nanotubes have already been created.

New research relating to controlled motion of graphene structure defects were published in the latest issue of “Experimental and Theoretical Physics Journal”.

Researchers at the L.V. Kirensky Institute of Physics and Siberian Federal University carried out theoretical study of graphene structural defects influence on its elastic properties. The specialists considered vacancy as a defect. The word “vacancy” implies in this case disturbance of atomic arrangement periodicity in graphene structure. “Ideal” graphene is a highly-ordered structure, where each atom is “in its place”. If an atom is absent from the place assigned to it in the structure, then a defect is formed – a vacancy, a peculiar “blank space” in graphene crystal lattice.

To study elastic properties, the researchers determined the Young modulus. This coefficient characterizes the material’s ability to resist compression or extension: the higher Young modulus is, the stronger the material is. For reference: the Young modulus of aluminum is about 70 hPa, that of steel is  210 hPa, and that of “ideal” graphene is about 1,000 hPa! As a result of studies, the researchers came to the conclusion that the more defects in graphene structure are, the lower the Young modulus is. This dependence was expressed in strict inverse proportionality.

Besides this parameter, the researchers also assessed traverse speed of vacancies in graphene subject to direction the deformation is applied at. Obtained knowledge is extremely necessary to enable ordered motion of defects in graphene. It has turned out that traverse speed of vacancies changed significantly (both upward and downward) depending on whether the sample was compressed or extended.

Source of information:

A.S. Fedorov, D.A. Fedorov, Z.I. Popov, Yu.E. Ananieva, N.S. Eliseyeva, A.A. Kuzubov “Mobility of vacancies under deformation and their influence on elastic properties of graphene”. Experimental and Theoretical Physics Journal (Zhurnal Eksperimentalnoi i Teoreticheskoi Fiziki), 2011, Vol. 139, issue 5.

Azat Hadiev, published by STRF.ru

 

Views: 54

Tags: elastic, graphene, nano, propertie

Comment

You need to be a member of The International NanoScience Community to add comments!

Join The International NanoScience Community


Full member
Comment by Gamal Amin on May 18, 2011 at 4:14pm

Graphene is a good conductor, may be with better properties than semiconductors. It is 300 times stronger than steel and its much more flexible.

It is very suitable for applications such as flexible electronic devices, very thin cell phones and other applcations

Latest Activity

Welcome - about us

Welcome! Nanopaprika was cooked up by Hungarian chemistry PhD student in 2007. The main idea was to create something more personal than the other nano networks already on the Internet. Community is open to everyone from post-doctorial researchers and professors to students everywhere.

There is only one important assumption: you have to be interested in nano!

Nanopaprika is always looking for new partners, if you have any idea, contact me at editor@nanopaprika.eu

Dr. András Paszternák, founder of Nanopaprika

Publications by A. Paszternák:

Smartphone-Based Extension of the Curcumin/Cellophane pH Sensing Method

Pd/Ni Synergestic Activity for Hydrogen Oxidation Reaction in Alkaline Conditions

The potential use of cellophane test strips for the quick determination of food colours

pH and CO2 Sensing by Curcumin-Coloured Cellophane Test Strip

Polymeric Honeycombs Decorated by Nickel Nanoparticles

Directed Deposition of Nickel Nanoparticles Using Self-Assembled Organic Template,

Organometallic deposition of ultrasmooth nanoscale Ni film,

Zigzag-shaped nickel nanowires via organometallic template-free route

Surface analytical characterization of passive iron surface modified by alkyl-phosphonic acid layers

Atomic Force Microscopy Studies of Alkyl-Phosphonate SAMs on Mica

Amorphous iron formation due to low energy heavy ion implantation in evaporated 57Fe thin films

Surface modification of passive iron by alkylphosphonic acid layers

Formation and structure of alkylphosphonic acid layers on passive iron

Structure of the nonionic surfactant triethoxy monooctylether C8E3 adsorbed at the free water surface, as seen from surface tension measurements and Monte Carlo simulations

Next partner events of TINC

We are Media Partner of: