Sentences with phrase «graphene nitride»

Now, the M.D. Anderson Chair Professor and mechanical engineering department chairman at the University of Houston Cullen College of Engineering, Pradeep Sharma, and his doctoral student, Matthew Zelisko, in collaboration with scientists at Rice University and University of Washington, have identified one of the thinnest possible piezoelectric materials on the planet — graphene nitride.

Sharma and Zelisko's experimental collaborators at Rice University, led by engineering professor Pulickel Ajayan, fabricated the graphene nitride sheet devices.

Not exact matches

Raman spectroscopy and transport measurements on the graphene / boron nitride heterostructures reveals high electron mobilities comparable with those observed in similar assemblies based on exfoliated graphene.

The scientists first grew carpets of microscopic wires of gallium nitride, a light - emitting crystalline material, on an ultrathin mesh of graphene, which is a layer of carbon atoms that is flexible, conductive and tough.

Illustration of the asymmetric supercapacitor, consisting of vertically aligned graphene nanosheets coated with iron nitride and titanium nitride as the anode and cathode, respectively.

Hui Huang from A * STAR's Singapore Institute of Manufacturing Technology and his colleagues from Nanyang Technological University and Jinan University, China, have fabricated asymmetric supercapacitors which incorporate metal nitride electrodes with stacked sheets of graphene.

«The graphene forms a sandwich structure with the carbon nitride nanosheets and results in further redistribution of electrons.

Performance was further improved by combining the ruthenium - doped carbon nitride with graphene, a sheet - like form of carbon, to form a layered composite.

In graphene, boron nitride, and graphane the backbone distorts towards isolated six - atom rings, while molybdenum disulfide undergoes a distinct distortion towards trigonal pyramidal coordination.

The soft mode distortion ended up breaking graphene, boron nitride, and molybdenum disulfide.

And these principles apply not just to graphene but also to other two - dimensional materials, such as molybdenum disulfide, boron nitride, or other single - atom or single - molecule - thick materials.

Various methods of making graphene - based field effect transistors (FETs) have been exploited, including doping graphene tailoring graphene - like a nanoribbon, and using boron nitride as a support.

Within the honeycomb - like lattices of monolayers like graphene, boron nitride, and graphane, the atoms rapidly vibrate in place.

The researchers fully encapsulated the 2D graphene layer in a sandwich of thin insulating boron nitride crystals.

They plan to draw from the full suite of available 2D layered materials, including graphene, boron nitride, transition metal dichalcogenides (TMDCs), transition metal oxides (TMOs), and topological insulators (TIs).

The charge distribution of electrons and holes assumes a moiré pattern when graphene is placed on boron nitride.

In the case of graphene, boron nitride, and graphane, the backbone of the perfect crystalline lattice distorted toward isolated hexagonal rings.

What happens if the boron nitride layer is inserted between a layer of copper and a layer of graphene?

And if the combination of graphene / boron nitride is applied on copper for contact with the external world?

Bokdam has performed detailed electron structure theory calculations of graphene on boron nitride.

Bokdam now proposes that the gap does not arise when graphene and boron nitride are laid on top of one another at a random angle, but does arise when they are precisely rotated relative to one another.

Electrical current is injected into the device, tunnelling from single - layer graphene, through few - layer boron nitride acting as a tunnel barrier, and into the mono - or bi-layer TMD material, such as tungsten diselenide (WSe2), where electrons recombine with holes to emit single photons.

They took a graphene monolayer (which acts as a semi-metal), and stacked onto it a hexagonal boron nitride (hBN) monolayer (an insulator), and on top of this deposited an array of metallic rods.

Constructed of layers of atomically thin materials, including transition metal dichalcogenides (TMDs), graphene, and boron nitride, the ultra-thin LEDs showing all - electrical single photon generation could be excellent on - chip quantum light sources for a wide range of photonics applications for quantum communications and networks.

Illumination of a GBN heterostructure even with just an incandescent lamp can modify electron - transport in the graphene layer by inducing a positive - charge distribution in the boron nitride layer that becomes fixed when the illumination is turned off.

Like graphene, boron nitride nanosheets are two dimensional, but instead of conducting electricity like graphene they resist and insulate against it.

Boron nitride is a layered compound that features a similar hexagonal lattice — in fact hexagonal boron nitride is sometimes referred to as «white graphene.»

A paper on this research has been published in the journal Nature Nanotechnology entitled «Photoinduced doping in heterostructures of graphene and boron nitride.»

«We've shown show that this photo - induced doping arises from microscopically coupled optical and electrical responses in the GBN heterostructures, including optical excitation of defect transitions in boron nitride, electrical transport in graphene, and charge transfer between boron nitride and graphene,» Wang says.

Semiconductors made from graphene and boron nitride can be charge - doped using light.

The graphene monolayer lies on a thin film of silicon nitride (red) that in turn is on a quartz microbalance (blue) and can be subjected to a potential via a gold contact (yellow).

The graphene rests on an insulator layer of boron nitride, which rests on a silicon semiconductor.

«To inject spins into the graphene, you have to make them pass through the upper layer of the boron nitride insulator.

On top of the graphene is a very thin layer, just a few atoms thick, of boron nitride, which protects the electrons in the graphene from outside influences.

The researchers compared the effect of two different substrates on the growth of the phosphorene nanoflake — a copper substrate, commonly used for growing graphene, which bonds with the phosphorene through strong chemical processes, and a hexagonal hydrogen boron nitride (h - BN) substrate that couples with the phosphorene via weak van der Waals bonds.

And while their membrane is thicker, about 5 nanometers, silicon nitride pores can also approach graphene in terms of thinness due to the way they are manufactured.

The high - quality material graphene, a single - atomic layer of carbon, embedded in hexagonal boron nitride demonstrates unusual physics due to the hexagonal — or honey comb — symmetry of its lattice.

In this experiment, Drndić and her colleagues worked with a different material — silicon nitride — rather than attempting to craft single - atom - thick graphene membranes for nanopores.

«This is the first time we have ever seen that graphene on a boron nitride surface can be fabricated in such a controllable way,» Zhang explained.

«Swapping substrates improves edges of graphene nanoribbons: Using inert boron nitride instead of silica creates precise zigzag edges in monolayer graphene.»

This new approach — of encapsulating graphene constrictions between layers of boron nitride — allowed for exceptionally clean samples, and thus highly accurate measurements.

Long Ju, Feng Wang and Jairo Velasco Jr., have been using visible light to charge - dope semiconductors made from graphene and boron nitride.

Monolayer - thick sheets of hexagonal boron nitride, aka «white graphene,» could be the perfect ultra-thin partner for graphene

Kim and colleagues first isolated a sample of pure graphene by protecting it between layers of hexagonal boron nitride, an insulating, transparent crystal also known as «white graphene» for its similar properties and atomic structure.

For this experiment, Wang constructed bilayer graphene encapsulated in a hexagonal lattice of boron nitride.

Monolayer - thick sheets of hexagonal boron nitride, aka «white graphene,» could be the perfect ultra-thin partner for graphene (Credit: < a href ="http://www.shutterstock.com/pic.mhtml?id=115490785&src=id" rel="nofollow"> Shutterstock )

Creating a superlattice by placing graphene on boron nitride may allow control of electron motion in graphene and make graphene electronics practical.

It is based on boron nitride, a graphene - like 2D material, and was selected because of its capability to manipulate infrared light on extremely small length scales, which could be applied for the development of miniaturized chemical sensors or for heat management in nanoscale optoelectronic devices.

Led by Prof Coleman, in collaboration with the groups of Prof Georg Duesberg (AMBER) and Prof. Laurens Siebbeles (TU Delft, Netherlands), the team used standard printing techniques to combine graphene nanosheets as the electrodes with two other nanomaterials, tungsten diselenide and boron nitride as the channel and separator (two important parts of a transistor) to form an all - printed, all - nanosheet, working transistor.

We address this issue in a fully hexagonal boron nitride (hBN) encapsulated graphene spin valve device which demonstrated the possibility to inject and detect spins in graphene with differential spin injection and detection polarizations up to 100 % by applying a bias across the cobalt / 2L - hBN / graphene / hBN contacts at room temperature.