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New Family of Quasiparticles Discovered in Graphene Based Materials
New Family of Quasiparticles Discovered in Graphene Based Materials
A group of researchers led by Sir Andre Geim and Dr. Alexey Berdyugin at The University of Manchester have discovered and characterized a new family of quasiparticles named 'Brown-Zak fermions' in graphene-based superlattices.
The team achieved this breakthrough by aligning the atomic lattice of a graphene layer to that of an insulating boron nitride sheet, dramatically changing the properties of the graphene sheet.
Source: https://phys.org/news/2020-11-scientists-family-quasiparticles-graphene-based-materials.html?fbclid=IwAR3V-G7XzXUgEb7TWaXFS4wd04XFVSx7yX-jLfSbHdngNJ--8_bCf6QZ030
Engineers Invented a New Way to Store Data Using Atomically-Thin 2D Materials Instead of Silicon Chips
Engineers Invented a New Way to Store Data Using Atomically-Thin 2D Materials Instead of Silicon Chips
A Stanford-led team has invented a way to store data by sliding atomically thin layers of metal over one another, an approach that could pack more data into less space than silicon chips, while also using less energy.
The research, led by Aaron Lindenberg, associate professor of materials science and engineering at Stanford and at the SLAC National Accelerator Laboratory, would be a significant upgrade from the type of nonvolatile memory storage that today’s computers accomplish with silicon-based technologies like flash chips.
Courtesy: SciTechDaily (https://scitechdaily.com/engineers-invented-a-new-way-to-store-data-using-atomically-thin-2d-materials-instead-of-silicon-chips/)
Boron Nitride Discovery Might Hold The Key To Next-Gen Semiconductors - 2D Materials Key To Overcome Scalability Issues
Boron Nitride Discovery Might Hold The Key To Next-Gen Semiconductors - 2D Materials Key To Overcome Scalability Issues
The newly discovered material, called amorphous boron nitride (a-BN), consists of boron and nitrogen atoms with an amorphous molecule structure. While amorphous boron nitride is derived from white graphene, which includes boron and nitrogen atoms arranged in a hexagonal structure, the molecular structure of a-BN, in fact, makes it uniquely distinctive from white graphene.
Limits on gas impermeability of graphene
Limits on gas impermeability of graphene
Graphene theoretically boasts a very high energy for the penetration of atoms and molecule, which prevents any gases and liquids from passing through it at room temperature. Indeed, it is estimated that it would take longer than the lifetime of the Universe to find an atom energetic enough to pierce a defect-free monolayer graphene of any realistic size under ambient conditions, say the researchers led by Professor Sir Andre Geim. This hypothesis is supported by real-world experiments performed over a decade ago which found that one-atom-thick graphene was less permeable to helium atoms than a quartz film of a few microns in thickness. Although the film is 100,000 thicker than graphene, this is still very far from the theoretical limit.
Highly efficient graphene based solar thermal film
Highly efficient graphene based solar thermal film
Researchers at the Center for Translational Atomaterials (CTAM) at Swinburne University of Technology in Melbourne, Australia, have developed a new graphene-based film that can absorb sunlight with an efficiency of over 90 percent, while simultaneously eliminating most IR thermal emission loss—the first time such a feat has been reported.
The result is an efficient solar heating metamaterial that can heat up rapidly to 83 degrees C (181 degrees F) in an open environment with minimal heat loss. Proposed applications for the film include thermal energy harvesting and storage, thermoelectricity generation, and seawater desalination.
A 3D map of atoms in 2D materials
A 3D map of atoms in 2D materials
Scanning atomic electron tomography measurements reveal the 3D local structure around single dopant atoms in 2D transition metal dichalcogenides, providing essential information to investigate and predict their electronic properties.
Bending of graphene on hBN
Bending of graphene on hBN
Bending of few-layer graphene leads to interlayer slip, and slipping lowers the bending stiffness. Beyond a critical bending angle, the graphene layers bend like a stack of paper, with a state of superlubricity for interlayer slip.
Fatigue of Graphene
Fatigue of Graphene
This is for the very first time, the dynamics response of a layered material has been investigated. The study will provide a quantum leap in fabricating graphene based devices for stretchable electronics. Congrats to the authors (I'm not there :) ) at #NMML at #UofT. This is an exciting avenue to explore! I do really want to follow this path of investigating the nano mechanics of layered materials onto polymer substrates/islands. The work place just got more exciting.
Superpower of super thin materials!
Superpower of super thin materials!
As researchers like Dr. Palacios see it, two-dimensional materials will be the linchpin of the internet of everything. They will be “painted” on bridges and form the sensors to watch for strain and cracks. They will cover windows with transparent layers that become visible only when information is displayed. And if his team’s radio wave-absorber succeeds, it will power those ever-present electronics. Increasingly, the future looks flat. [Source: NY Times]
Read more: https://www.nytimes.com/2020/01/07/science/physics-materials-electronics.html
Sublimation, not melting: Graphene surprises researchers again
Sublimation, not melting: Graphene surprises researchers again
Physicists from the Moscow Institute of Physics and Technology and the Institute for High Pressure Physics of the Russian Academy of Sciences have used computer modeling to refine the melting curve of graphite that has been studied for over 100 years, with inconsistent findings. They also found that graphene "melting" is, in fact, sublimation. The results of the study are published in the journal Carbon. [Source: Phys.org]
Read more: https://phys.org/news/2020-01-sublimation-graphene.html
Electrons flow like water in ultra pure graphene!!!
Electrons flow like water in ultra pure graphene!!!
Electrons can behave like a viscous liquid as they travel through a conducting material, producing a spatial pattern that resembles water flowing through a pipe. So say researchers in Israel and the UK who have succeeded in imaging this hydrodynamic flow pattern for the first time using a novel scanning probe technique. The result will aid developers of future electronic devices, especially those based on 2D materials like graphene in which electron hydrodynamics is important. [Source: Physics World]
Read more: https://www.nature.com/articles/s41586-019-1788-9
3-D printed 2-D BN for higher thermal conductivity
3-D printed 2-D BN for higher thermal conductivity
Extrusion-based 3D printing can vertically align 2D nanosheets to improve heat and electricity transport perpendicular to the sheet plane, report researchers at the University of Maryland . Among the many uses, the researchers suggest that it could accelerate the cooling of CPU chips in circuits, by transporting the heat vertically away from the source. [Source: Physics World]
To read more: https://pubs.acs.org/doi/10.1021/acsnano.9b04202
Tunable crystal symmetry in graphene–boron nitride heterostructures with coexisting moiré superlattices
Tunable crystal symmetry in graphene–boron nitride heterostructures with coexisting moiré superlattices
A recent study from the labs of James Hone (mechanical engineering) and Cory Dean (physics) demonstrates a new way to tune the properties of two-dimensional (2-D) materials simply by adjusting the twist angle between them. The researchers built devices consisting of monolayer graphene encapsulated between two crystals of boron nitride and, by adjusting the relative twist angle between the layers, they were able to create multiple moiré patterns. [Source: phys.org news]
To read more: https://www.nature.com/articles/s41565-019-0547-2
Carbon Quantum Dot (CQD) as a by-product of sonic exfoliation process!!!
Carbon Quantum Dot (CQD) as a by-product of sonic exfoliation process!!!
A group of researchers from IIT, India recently showed that bare organic solvent, when exposed to ultrasonication, transforms into 2D photoluminescent carbon quantum dots (CQDs) that display blue, cyan, green, and yellow emissions depending upon the excitation wavelength. The discovery was by accident!! The researchers first thought there is an error in the experiment. To find out more, read:
Graphene: The more you bend, the softer it becomes
Graphene: The more you bend, the softer it becomes
New research by engineers at the University of Illinois combines atomic-scale experimentation with computer modeling to determine how much energy it takes to bend multilayer graphene—a question that has eluded scientists since graphene was first isolated. The findings are reported in the journal Nature Materials.
https://www.nature.com/articles/s41563-019-0529-7.pdf
The "magic" angle of superconductivity for bi-layer graphene!!
The "magic" angle of superconductivity for bi-layer graphene!!
Stacked honeycomb lattices of carbon atoms begin to conduct electricity with zero resistance when twisted at a relative angle of 1.1 degrees.
https://www.quantamagazine.org/whats-the-magic-behind-graphenes-magic-angle-20190528/
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