Articles tagged with Monolayers
The study reveals the existence of moiré trions, confined electronic excited states that exhibit novel characteristics and differ from conventional trions. Moiré trions can emit single photons, making them a feasible optical source for quantum information technology.
The study reveals that the carrier transport behavior changes from semiconducting to metallic properties as the number of layers increases, with a crossover point at around five layers. This discovery provides design guidelines for graphene devices and accelerates their application in high-speed transistors and ultra-thin wiring.
A study from Brazil's University of São Paulo used self-assembled molecular monolayers to create biosensors for detecting the gene PCA3, which is specific to prostate cancer cells. The technique can also be used to diagnose infectious diseases like COVID-19, offering a non-invasive alternative to current methods.
Researchers used machine learning to identify different areas of interest on 2D materials, such as doping, strain, and electronic disorder. This automation could significantly accelerate the application of these materials in next-generation energy-efficient computing and smart-phones.
Researchers from USTC establish bridges between atoms and make catalysts of high quality. They apply substitutional doping method to prepare Co-doping MoS2 monolayer, which shows dramatically increased exchange current density during electrochemical hydrogen evolution reaction.
Physicists at UC Riverside created moiré patterns by overlaying WS2 and WSe2 layers, leading to insulating states with varying electron occupancy fractions. Strong interactions between electrons restrict mobile electrons into local cells, resulting in insulating behavior. Similar behaviors can occur for other occupancy fractions.
Scientists investigate the structural stability, electronic states, and transformation of crystal phases of a recently identified polymorph of gallium selenide monolayer. The study reveals that the new phase is metastable, with stability reversing upon applying tensile strain, and large energy barriers for phase transitions.
A team of scientists has developed a novel type of quantum emitter formed from spatially separated InGaN monolayer islands. The isolated islands exhibit high photostability and can be spectrally filtered to act as bright, fast single photon emitters at a wavelength of ~400 nm.
A self-assembling monolayer of electrochemically active molecules protects the surface of the lithium anode, preventing dendritic growth and increasing cycle life. This technology enables cold charging and quick-charging capabilities in lithium metal batteries.
Scientists demonstrate efficient separation of valley exciton emission of a WS2 monolayer using two-dimensional all-dielectric PhC slabs without in-plane inversion symmetry. The delocalized Bloch modes play a critical role in separating and enhancing directional valley exciton emission.
Researchers develop innovative method to fabricate high performance lenses in monolayer two dimensional transitional metal dichalcogenide (TMDC) material using femtosecond laser. The lens provides subwavelength resolution and high efficiency, enabling diffraction-limited imaging.
A new study applies liquid-metal synthesis to create atomically-thin tin-monosulfide with excellent electronic and piezoelectric properties, enabling flexible nanogenerators for wearable electronics and biosensors. The resulting material displays high durability and flexibility, making it suitable for commercial implementation.
Researchers at Oak Ridge National Laboratory developed a method to implant atoms precisely into ultra-thin crystals, yielding Janus structures with different chemical compositions. This technique may improve the abilities of transition metal dichalcogenides (TMDs) to separate charge and catalyze chemical reactions.
Researchers from the University of Warsaw developed a method to grow transition metal dichalcogenide monolayers with excellent optical properties on atomically flat boron nitride substrates. The technique, using molecular beam epitaxy, overcomes previous limitations and allows for large-scale production of high-quality monolayers.
Surface doping of organic semiconductors using two-dimensional molecular crystals has been shown to improve their electronic properties. The use of 1D/2D composite single crystals enables highly controllable doping at the monolayer precision, resulting in increased mobility and reduced threshold voltage. This approach holds great promi...
Researchers have observed light emission from intervalley transitions in monolayer WSe2, which can be used to read out valley information and potentially lead to new types of devices. The transition involves an electron and a hole in opposite valleys recombining with the assistance of defects or lattice vibrations.
A Cornell-led collaboration has successfully created a solid-state platform to simulate the Hubbard model in two dimensions, mapping a longstanding conundrum in physics: the phase diagram of the triangular lattice Hubbard model. The team observed a Mott insulating state and mapped the system's magnetic phase diagram.
Researchers from Sungkyunkwan University provide a comprehensive review of heterogeneously integrated two-dimensional materials, enabling the design of novel devices. The review discusses various 2D heterostructures, their physical characteristics, and new functional applications.
Researchers develop a new method to manipulate light's phase without changing its amplitude, reducing optical loss and electrical power consumption. This breakthrough enables the scaling of photonic circuits and reduces power dissipation in applications like LIDAR and neural circuits.
Researchers at Columbia University have developed a new method to isolate atomic sheets from layered van der Waals crystals, producing large-area atomically thin layers with high quality. The monolayers can be stacked in any desired order and orientation to generate a whole new class of artificial materials.
A new intercalation strategy boosts superconductivity in layered materials, enabling tailored topological properties. The method, developed by Tsinghua University researchers, shows enhanced superconductivities and good sample stabilities in intercalated MoTe2 and WTe2.
Scientists at the University of Groningen have created a new self-assembled monolayer using buckyballs functionalized with ethylene glycol, which remains chemically unchanged for several weeks when exposed to air. This makes it easier to use in research and devices, and could lead to breakthroughs in molecular electronics.
Researchers from NUS have synthesised the world's first one-atom-thick amorphous material, known as monolayer amorphous carbon (MAC), which shows exceptional properties such as plastic deformation and ability to withstand holes. This breakthrough could lead to new industrial applications in various fields.
Researchers have confirmed the composition of an amorphous structure as a random network containing nanocrystallites, providing strong evidence for one side of the primordial debate. The discovery opens the door for research into other amorphous two-dimensional materials with potentially promising applications.
Researchers developed a nano-tomographic technique to detect invisible properties of nano-structured light landscapes in the focus of a lens. This approach enables single, fast, and straightforward camera imaging of these complex light fields.
Researchers have discovered a crossover in PtTe2 films from a 2D metal to a 3D Dirac semimetal with spin texture induced by local Rashba effect. The work reveals a metallic band dispersion of PtTe2 thin films even down to 2 ML, showing a strong thickness-dependent evolution.
Engineers at the University of California San Diego have developed the world's thinnest optical device, a waveguide consisting of three layers of atoms thin. The waveguide channels light in the visible spectrum and supports electron-hole pairs, generating a strong optical response.
Researchers successfully introduced carbon atoms into tungsten disulfide, creating an ambipolar semiconductor with bipolar effect. The technique enables the production of new components for energy-efficient devices with improved conductivity and catalytic activity.
Researchers from Moscow Institute of Physics and Technology have synthesized a quasi-2D gold film by using monolayer molybdenum disulfide as an adhesion layer. The resulting ultrathin films conduct electricity well and are useful for flexible and transparent electronics.
Researchers have developed a hybrid material combining molybdenum disulfide and azobenzene that exhibits unique optical and transport properties. The structure makes the material attractive for building compactable and malleable quasi-two-dimensional transistors powered by light.
Researchers at UC Riverside and University of Washington have successfully imaged edge conduction in monolayer tungsten ditelluride, a 2D topological insulator. This discovery could lead to the development of more efficient electronic devices by exploiting this unique property.
The study reports the observation of an XY-type antiferromagnetic material whose magnetic order becomes unstable when reduced to one-atom thickness. This finding is consistent with theoretical predictions dating back to the 1970s.
Researchers from Kaunas University of Technology (KTU) and Helmholtz Zentrum Berlin (HZB) developed a novel approach to form selective contact layers in perovskite solar cells using self-assembling monolayers. This method achieves extremely low material consumption and high efficiency, outperforming traditional methods.
A new method has been developed to efficiently harvest 2-D materials at the wafer scale, opening up opportunities for flexible electronics. This technique allows researchers to separate individual monolayers of 2-D material in just a few minutes, paving the way for commercialization.
Scientists at the University of Washington discovered ferroelectric switching in the 2-D form of tungsten ditelluride, a metal that can be applied to memory storage and capacitors. The discovery reveals a spontaneous electrical polarization that can be flipped by an applied electric field.
A team of physicists from Konstanz and Italy successfully suppressed static friction between two surfaces using a colloidal monolayer. This allows for the use of extremely small forces to move objects, greatly improving efficiency in micro- and nanomechanical systems.
UC Berkeley engineers create a millimeter-wide, transparent light-emitting device using monolayer semiconductors. The device can emit bright light when turned on and become see-through when turned off, opening possibilities for invisible displays.
Researchers successfully synthesized a purely honeycomb borophene sheet on an Al(1 1 1) surface, exhibiting a planar, non-buckled honeycomb lattice similar to graphene. Theoretical calculations show that the structure is energetically stable and could enable superconductivity.
Researchers developed a low-temperature reaction to replace sulfur with tellurium in MoS2, creating new properties in the 2D material. The 'sodium-scooter' catalyst enables conversion at 525°C, lower than previous temperatures.
KAUST researchers have devised a strategy to integrate transparent conducting metal-oxide contacts with 2D semiconductors into fully transparent devices. The team used aluminum-doped zinc oxide, a low-cost transparent and electrically conductive material, to generate series of devices and circuits.
A team at Berkeley Lab has precisely measured the band gap and tuning mechanism of monolayer molybdenum disulfide, a 2-D semiconducting material. The study reveals a powerful tuning mechanism and interrelationship between electronic and optical properties.
Researchers observed atomic-level dissolution processes of calcite using high-speed FM-AFM, revealing an intermediate state called the transition region. The team proposes a new dissolution mechanism involving the formation of Ca(OH)2 monolayer and its effects on surface stability.
Researchers at Vanderbilt University have developed a method to produce patterned monolayers that can perform multiple functions, such as catalyzing chemical reactions and sensing molecules. These materials offer a new option for device designers, allowing for the creation of single materials with two functionalities.
Researchers have discovered intrinsic magnetism in isolated 2-D materials, a breakthrough that could lead to the development of more efficient and compact magnetic devices. The discovery was made using Scotch tape to exfoliate monolayers from larger crystals, revealing unique properties not seen in their 3-D forms.
University of Washington researchers have made a breakthrough in building electrically pumped nanolasers, critical for high-performance parallel computing and data center efficiency. By integrating atomically thin monolayer materials with nano-cavities, they have achieved efficient light emission and modulation.
Researchers have demonstrated the magnetic behavior of iron trithiohypophosphate (FePS3) crystals, providing the first experimental proof of Onsager's 1943 prediction. The team used Raman spectroscopy to measure magnetism in 2D FePS3 monolayers and found consistent patterns with bulk samples.
A team of researchers at UT Dallas developed a new method for trapping gases within MOF structures, which can capture emissions from coal factories and vehicles. The discovery was made possible by introducing a molecule that sealed the outer surface of each MOF crystal, effectively trapping gases.
Friction on graphene increases with continued sliding and is higher than in multi-layered graphene or graphite. Scientists attribute this to evolving contact quality and real contact area.
Researchers at NYU Tandon School of Engineering have developed a method for growing high-quality monolayer tungsten disulfide, a material with electronic and optoelectronic applications. The technique boasts the highest carrier mobility values recorded thus far for this material.
Researchers have developed novel light sources using 2-D materials, which can be used to transfer information securely. The light sources emit photons in pairs, making them ideal for quantum communication. Additionally, the novel lasers exhibit self-sustaining properties, opening up new possibilities for studying quantum effects.
Researchers at the Institute of Physical Chemistry of the Polish Academy of Sciences have developed a novel method to create stable monolayers of nanoparticles. The new technique, known as 'tailored' chemistry, uses linker molecules to link adjacent nanoparticles together, creating a stable and durable structure.
Researchers at Rice University have successfully absorbed 35-37% of incident light in atomically thin MoS2, paving the way for efficient and inexpensive photovoltaic solar panels. The team's findings enhance light absorption by 5.9 times compared to using MoS2 on a sapphire substrate.
Researchers at Oak Ridge National Laboratory synthesized a stack of monolayers of two lattice-mismatched semiconductors, gallium selenide and molybdenum diselenide. The achievement demonstrates the promise of synthesizing mismatched layers to enable new families of functional two-dimensional materials.
Scientists with Berkeley Lab have demonstrated the ability to electrically generate and control valley electrons in a two-dimensional semiconductor, which could lead to faster and more energy-efficient computing technologies. The breakthrough enables future computer chips to process more information with less power.
Researchers develop novel, low-cost, and ultra-lightweight antireflective surface for microwave radiation based on the structure of moth eyes. The new material achieves almost perfect microwave absorption, ideal for applications in radar absorbing materials and stealth technology.
A team of engineers at UC Berkeley has developed a method to fix defects in monolayer semiconductors, increasing photoluminescence quantum yield by 100-fold. The technique uses an organic superacid to create defect-free material for applications such as transparent LED displays and high-performance transistors.
Researchers from Berkeley Lab demonstrate bright excitonic lasing at visible light wavelengths using a monolayer of tungsten disulfide in a microdisk resonator. The technology has potential for high-performance optical communication and computing applications, as well as valleytronic applications.
SLAC's 'electron camera' visualizes ripples in 2D material for the first time, revealing atomic-level movements and guiding future device development. The breakthrough could lead to efficient solar cells, fast electronics and high-performance catalysts.
Researchers have developed an electrospray technique to improve Langmuir-Blodgett assembly, reducing the need for toxic organic solvents and increasing efficiency. This approach enables the creation of well-dispersed nanoparticle monolayers with precise control over packing density.
Researchers at Stanford University have created an artificial crystal with a variable band gap using molybdenum disulfide, a material that can be stretched without breaking. This could lead to the development of more efficient solar cells that absorb energy from a broader spectrum of light.