SWNTs can be seen
as sheets of graphene cut in such a way that they can be rolled into a cylinder.
Not exact matches
Single
graphene sheets are chemically reactive, but stacked layers
of graphene — otherwise known
as graphite, or pencil «lead» — are inert.
Rice materials scientist Rouzbeh Shahsavari and alumnus Navid Sakhavand first built atom - level computer models
of pillared
graphene —
sheets of graphene connected by covalently bonded carbon nanotubes — to discover their strength and electrical properties
as well
as their thermal conductivity.
Graphene is essentially an ultra-thin
sheet of carbon and possesses exciting properties such
as high mechanical stability and remarkable electrical conductivity.
Graphene, a one - atom - thick carbon
sheet, has taken the world
of physics by storm — in part, because its electrons behave
as massless particles.
«Interestingly we observed that when the
graphene is decorated by maghemite, the
graphene sheets spontaneously start to roll into perfect Archimedean nano scrolls, while when decorated by the less magnetic hematite nanoparticles the
graphene remain
as open
sheets, says Thomas Wågberg, Senior lecturer at the Department
of Physics at Umeå University.
Two examples:
graphene — single - atom - thick
sheets of carbon atoms — has unique mechanical, electrical, and optical properties; and two - dimensional electron gases (2DEG)-- planar collections
of electrons supported at the interface between certain semiconductors such
as gallium arsenide — allow the observation
of such emergent behaviors
as the quantum Hall effect and the spin Hall effect.
When the sharp tip
of the STM is poised over a
sheet of graphene, it produces a circular barrier on the
sheet that «acts
as a perfect curved mirror» for electrons, Levitov says, reflecting them along the curved surface until they begin to interfere with themselves.
This year's Nobel Prize in Physics went to the discoverers
of the one - atom - thick
sheets of carbon known
as graphene.
There are many ways to carve shapes out
of graphene — such
as using chemicals, lasers or oxygen plasma to etch away unwanted parts
of a
graphene sheet.
(Such
as, for instance, super-thin
sheets of carbon
graphene.)
Graphene, a single - atom - thick
sheet of carbon, is stronger than steel and
as stiff
as diamond.
By using the probe
of an atomic force microscope to trigger a local chemical reaction, Jeffrey Mativetsky, assistant professor
of physics at Binghamton University, and PhD student Austin Faucett showed that electrically conductive features
as small
as four nanometers can be patterned into individual
graphene oxide
sheets.
The functional groups cross-linked the
graphene sheets to each other, and even though no liquids were involved, they produced a tiny amount
of water
as a byproduct
of the reaction, Kabbani said.
Comprising tiny rolled
sheets of graphene oxide, these structures can zip around easily through both oil and water, picking up any oil particles they encounter and transporting them
as cargo for later release.
For faster, longer - lasting water filters, some scientists are looking to
graphene — thin, strong
sheets of carbon — to serve
as ultrathin membranes, filtering out contaminants to quickly purify high volumes
of water.
Through such a device, electrical charge can be rapidly stored on the
graphene sheets, and released from them
as well for the delivery
of electrical current and, thus, electrical power.
Photo: Wikipedia, CC But With all the Advantages
of Supercapacitors
As you can see above,
graphene is a one - atom thick
sheet of carbon atoms, very similar to carbon nanotubes, except for the «tube» part.
All these years we were trying to create great substances and literally stripping off
sheets of graphene as we used our pencils.