Content for Graphene

Graphene

Graphene is an allotrope of carbon in the form of a single layer of atoms in a two-dimensional hexagonal lattice in which one atom forms each vertex. It is the basic structural element of other allotropes, including graphite, charcoal, carbon nanotubes and fullerenes. It can also be considered as an indefinitely large aromatic molecule, the ultimate case of the family of flat polycyclic aromatic hydrocarbons. Graphene has a special set of properties which set it apart from other allotropes of carbon. In proportion to its thickness, it is about 100 times stronger than the strongest steel. Yet its density is dramatically lower than any steel, with a surfacic mass of 0.763 mg per square meter. It conducts heat and electricity very efficiently and is nearly transparent. Graphene also shows a large and nonlinear diamagnetism, even greater than graphite, and can be levitated by Nd-Fe-B magnets. Researchers have identified the bipolar transistor effect, ballistic transport of charges and large quantum oscillations in the material.

Chinese scientists develop glass as hard as a diamond

“Using a diamond to cut glass is not news, but a research team in northern China recently developed the world’s hardest glassy material that can leave a deep scratch on the surface of a diamond with ease. The (tentatively …

Graphene binds drugs which kill bacteria on implants

“Bacterial infections relating to medical implants place a huge burden on healthcare and cause great suffering to patients worldwide. Now, researchers at Chalmers, have developed a new method to prevent such infections, by covering a graphene-based material with bactericidal molecules …

Invisible barrier breakthrough a boon for electronics, artwork and more

“Curtin University researchers have found applying a thin invisible layer of graphene oxide to silicon forms an impermeable barrier, which could be used to protect artwork, prevent corrosion of metals, and produce higher efficiency solar cells. Lead author Dr Nadim …

LLNL optimizes flow-through electrodes for electrochemical reactors with 3D printing

“To take advantage of the growing abundance and cheaper costs of renewable energy, Lawrence Livermore National Laboratory (LLNL) scientists and engineers are 3D printing flow-through electrodes (FTEs), core components of electrochemical reactors used for converting CO2 and other molecules to …

Towards next-gen computers: Mimicking brain functions with graphene-diamond junctions

“Scientists from Japan mimic the brain’s functions with junctions between vertically aligned graphene and diamond The human brain holds the secret to our unique personalities. But did you know that it can also form the basis of highly efficient …

“Magic-angle” trilayer graphene may be a rare, magnet-proof superconductor

“New findings might help inform the design of more powerful MRI machines or robust quantum computers. MIT physicists have observed signs of a rare type of superconductivity in a material called magic-angle twisted trilayer graphene. In a study appearing today …

Scientists Create World’s Thinnest Magnet

“A one-atom-thin 2D magnet developed by Berkeley Lab and UC Berkeley could advance new applications in computing and electronics The development of an ultrathin magnet that operates at room temperature could lead to new applications in computing and electronics – such …

The mathematics of repulsion for new graphene catalysts

“A new mathematical model helps predict the tiny changes in carbon-based materials that could yield interesting properties. Scientists at Tohoku University and colleagues in Japan have developed a mathematical model that abstracts the key effects of changes to the geometries …

Custom-made MIT tool probes materials at the nanoscale

“A scattering-type scanning nearfield optical microscope offers advantages to researchers across many disciplines. An MIT physicist has built a new instrument of interest to MIT researchers across a wide range of disciplines because it can quickly and relatively inexpensively determine …

New mechanism of superconductivity discovered in graphene

“Placing a 2D Bose-Einstein condensate in the vicinity of a graphene layer confers superconductivity to the material Superconductivity is a physical phenomenon where the electrical resistance of a material drops to zero under a certain critical temperature. Bardeen-Cooper-Schrieffer (BCS) theory …