Scientists at the London Centre for Nanotechnology and Department of Physics & Astronomy at UCL have discovered a potential way to make graphene – a single layer of carbon atoms with great promise for future electronics – superconducting.
The study, performed in collaboration with Stanford University and the SLAC National Accelerator Laboratory is published in Nature Communications.
Graphene, a single sheet of carbon atoms arranged in a honeycomb pattern, is the thinnest and strongest known material and a great conductor of electricity, among other remarkable properties. Scientists hope to eventually use it to make ultra fast transistors, sensors and transparent electrodes. Despite its array of exciting properties, superconducting graphene, in which electricity is conducted without resistance, is yet to be achieved.
The classic way to make graphene is by peeling atomically thin sheets from a block of graphite. But it is possible to isolate these carbon sheets by chemically interweaving graphite with arrays of calcium atoms to form calcium intercalated graphite or CaC6. While it’s been known for nearly a decade that this material is superconducting the new study uncovers the mechanism of superconductivity in unprecedented detail. The work therefore points to a pathway to make graphene itself superconducting – something the scientific community has dreamed about for a long time, but failed to achieve.
The combination of high purity samples and state-of-the-art light scattering experiments permitted the scientists to distinguish what the electrons in each layer were doing, revealing details of their behaviour that had not been seen before. Before now researchers were unable to confirm whether CaC6’s superconductivity came from the calcium layer, the graphene layer or both. The new discovered that electronic states associated both the calcium layer and graphene together with the resulting interaction between the two are essential for superconductivity. Thus to realise superconductivity in single graphene sheets, arrays of metal atoms must be first arranged on its surface.
Although applications of superconducting graphene are speculative and far in the future they could include ultra-high frequency analogue transistors, nanoscale sensors and electromechanical devices and quantum computing devices.
Learn more: A Potential Way to Make Graphene Superconducting
The Latest on: Superconducting graphene
via Google News
The Latest on: Superconducting graphene
- Saint Jean Carbon Exploring Magnetic Properties of Graphene With a Path Towards Superconducting on November 18, 2018 at 4:00 pm
OAKVILLE, ONTARIO--(Marketwired - Oct. 22, 2015) - Saint Jean Carbon Inc. ("Saint Jean" or the "Company") (TSX VENTURE:SJL), a carbon sciences company engaged in the development of natural graphite pr... […]
- Can graphene be the future of high-Tc superconductors? on October 26, 2018 at 6:30 am
A Twisted Bilayer Graphene (TBG) heterostructure at a particular angle shows correlated insulating states at half-filling; upon electrostatic doping away from these correlated insulating states, the m... […]
- Graphene and the atomic crystals that could see next big breakthrough in tech on July 2, 2018 at 10:54 am
An early example is the recent discovery that when you twist two layers of graphene at a “magic angle” relative to each other, the electrons become superconducting. This breakthrough, not clearly unde... […]
- Innovation! Phantom team is considering to join the superconducting graphene programming language group on May 3, 2018 at 7:35 pm
Phantom Lab once again added the innovative superconducting graphene to the blockchain, which was written in C language and developed based on the "Cryptonomex"... Phantom Lab once again added the inn... […]
- 'Magic' Twist in Stacked Graphene Reveals Potentially Powerful Superconducting Behavior on March 7, 2018 at 3:25 pm
High-temperature electricity without resistance could revolutionize electronics. It could take less energy to move electric charge, meaning better-performing, more-efficient electronics that are cheap... […]
- Graphene Could Be the Superconductor Scientists Always Dreamed Of on March 7, 2018 at 12:21 pm
Two layers of graphene, twisted at an angle of 1.1º (right) show superconducting properties. Image Credit: MIT researchers Scientists have known about graphene’s incredible conductive abilities for a ... […]
- Succeeded in creating both superconductivity and insulation by shifting the angle between two graphene layers on March 6, 2018 at 1:00 pm
It is also known that superconductors can be made by contacting other superconducting metals and graphene, and it is one of the promising materials for next-generation semiconductor materials. The res... […]
via Bing News