Articles tagged with Graphene
A team of researchers has used synchrotron light sources to observe the electron clouds on graphene's surface, revealing how folds and ripples can distort its conductivity. The study provides insight into the importance of understanding graphene's structure and processing methods for industrial applications.
Researchers at Northern Illinois University have discovered a simple method for producing high-yield graphene using a new process that converts carbon dioxide into few-layer graphene. The technique is cost-effective and green, offering a promising alternative to existing methods.
Researchers propose using mid-infrared lasers to create a band gap in graphene, allowing for the control of electrical conduction and paving the way for novel optoelectronic devices. The laser-induced band gap enables the transduction of optical into electrical signals.
Researchers at Penn propose two-dimensional graphene metamaterials that can manipulate electromagnetic waves in the infrared spectrum. The metamaterials' conductivity can be altered using voltage, enabling transformation optics and applications in telecommunications, imaging, and signal processing.
Researchers at the National University of Singapore have invented a graphene-based polarizer that can broaden the bandwidth of prevailing optical fibre-based telecommunication systems. This innovation uses graphene to convert light beams into polarized light, enabling multiple-channel high-speed optical communications.
The new method, developed by Qingkai Yu and Steven Pei, enables the growth of ordered arrays of thousands or millions of single crystals of graphene. This advance opens the possibility of replacing silicon with graphene in high-speed transistors and integrated circuits.
Researchers at NIST have identified a class of decorative defects in graphene that could alter its unique properties, including strength and conductivity. The discovery may lead to the development of more resilient materials.
Researchers from NPL and Linköping University have developed a method to identify graphene thickness using EFM, allowing for precise device applications. This technique is suitable for industrial environments and can be used to distinguish between one- and two-layer graphene.
A groundbreaking study by Prof. Adrian Bachtold's team has discovered nonlinear damping behavior in nanoscale mechanical devices, which facilitates amplification of signals and dramatic improvements in sensitivity. The findings have profound consequences for the physics of nanoelectromechanical resonators and will enable significant ad...
Researchers at UC Berkeley have developed a graphene-based optical device that can switch light on and off, enabling faster data transmission. The technology has the potential to revolutionize high-speed communications and computing, allowing for faster data streaming and processing.
Researchers confirm theoretical predictions and discover edge-states in graphene nanoribbons, exhibiting unique electronic properties. The findings open the possibility of building quick-acting, energy-efficient nanoscale devices from graphene-nanoribbon switches.
The EU Future Emerging Technology flagship pilot aims to bring together a large European research community to develop graphene science and technology. The coordination action will pave the way for a 10-year, €1 billion research program.
Researchers at NRL have demonstrated the polarization of graphene's valley degree of freedom through scattering off a naturally occurring line defect, offering a potential path to valleytronics. This discovery could lead to more robust and efficient electronic devices.
Researchers at NIST have shown that two layers of graphene exhibit random patterns of alternating positive and negative charges due to substrate interactions. This discovery brings graphene closer to being used in practical electronic devices.
The researchers discovered that graphene's mobility and conductivity decrease significantly when more than one layer is present. However, even the reduced mobility is higher than in many conventional semiconductors, offering a potential solution by using substrates to 'siphon off' heat generated by electric current.
Researchers at the University of Manchester have discovered a new way to interconnect electron spin and charge in graphene, enabling direct manipulation of electric current using microelectronics. This breakthrough has significant implications for spintronics, with potential applications in sensors, memories, and transistors.
Researchers at UMD have discovered a way to control magnetic properties of graphene, which could lead to new applications in magnetic storage and spintronics. The team found that missing atoms in graphene act as tiny magnets, interacting strongly with electrons and giving rise to a significant extra electrical resistance.
Researchers from the University of Arizona and Rensselaer Polytechnic Institute have developed graphene ceramic composites that exhibit new fracture resistance mechanisms, increasing toughness by over 200%. This breakthrough discovery could enable widespread use of ceramics in high-temperature applications.
Researchers at the University of Illinois have observed a nanoscale cooling effect in graphene transistors, which could enable devices to cool themselves and operate more efficiently. This self-cooling effect is stronger than resistive heating and has the potential to greatly improve energy efficiency.
Researchers at Georgia Tech have developed a templated growth technique to produce graphene nanoribbons with metallic properties, addressing the challenge of connecting graphene devices. The narrow ribbons can conduct current with minimal resistance, making them ideal for quantum devices.
Physicists at UCLA found that dividing space into discrete locations like a chessboard explains how point-like electrons manage to carry their intrinsic angular momentum. This concept, inspired by graphene's electronic properties, proposes that space at very small distances is segmented, rather than smooth.
Researchers controlled light scattering in graphene by manipulating quantum pathways, providing a new tool for studying this unique material. By controlling the excitation pathways, they can control the light emission, which has practical applications for controlling electronic states in graphene nanodevices.
Researchers have created a carbon cloak made of graphene that protects bacterial cells from shrinking under electron microscopes, allowing for high-resolution imaging. The graphene cloak uses the material's impermeability and strength to retain water in the cells, enabling scientists to observe them at their natural size.
Researchers found that graphene oxide's solubility is not as expected, with most oxygen content being loosely bound and easily removable by a wash with base. The study reveals that models for graphene oxide structure need revisiting, affecting synthesis and application of chemically modified graphene.
Researchers found that graphene's electronic properties were significantly improved when mounted on boron nitride, a material almost identical in structure to graphene. The team was able to measure the topography and electrical properties of the resulting smooth graphene layer with atomic resolution.
Researchers at Penn have created high-quality graphene that covers over 95% of its surface area using readily available materials and manufacturing processes. The production process can be scaled up to industrial levels, reducing costs and increasing flexibility.
Researchers have developed a method to create pristine sheets of graphene from regular table sugar, offering potential for lighter, faster and cheaper computer electronics. The technique allows for control over the film's thickness and opens up possibilities for doped graphene applications in various fields.
Researchers developed a method to isolate individual Andreev bound states in graphene-superconductor junctions, allowing for the measurement and manipulation of these unique states. This breakthrough may enable new applications in quantum computing and other fields.
Vikas Berry, a Kansas State University assistant professor of chemical engineering, has received a $400,000 CAREER award to study the production of graphene quantum dots. This research could lead to improved electronics and optoelectronics by controlling the properties of graphene.
Researchers created a new catalytic material that is harder, more chemically active, and provides stability for fuel cells. The material combines graphene with metal oxide nanoparticles, resulting in improved performance and durability.
Researchers at Vanderbilt University developed a technique to create graphene oxide films with adjustable surface roughness, leading to the creation of super-hydrophobic and super-hydrophilic surfaces. This could lead to applications in self-cleaning glasses, antifogging surfaces, corrosion protection, and more.
Researchers have discovered a new material, molybdenite, that can be used to make smaller and more energy-efficient electronic chips. Molybdenite has distinct advantages over traditional silicon or graphene for use in electronics applications.
Physicists in Iran have created a spintronic device based on armchair graphene nanoribbons, which could revolutionize handheld electronics and drastically reduce manufacturing costs. The device has been shown to be an effective spin switch, with properties useful for magnetic random access memory.
Researchers developed a method to generate spin current in graphene using ferromagnetic proximity effect and adiabatic quantum pumping. This breakthrough could lead to faster and more versatile electronics, replacing traditional devices one day.
Researchers at NIST found that layering graphene on a substrate transforms its properties, creating hills and valleys that hinder electron mobility. The study uses a scanning tunneling microscope (STM) to investigate graphene's ideal properties in real-world conditions.
A recent study by the National Physical Laboratory shows that light can control the electrical properties of graphene, enabling the development of new optoelectronic devices. The researchers successfully created a device that retains its modified properties until heated, opening up possibilities for highly sensitive sensors.
Researchers imaged graphene grain boundaries using diffraction imaging electron microscopy, revealing that impurities are responsible for fluctuating electrical conductivity. Larger grains do not improve conductivity as previously thought, highlighting the importance of controlling impurities in graphene growth.
Rice University physicists have created a formula to calculate the energies of graphene cut at any angle, which could lead to controlling the chirality of nanotubes. This breakthrough has profound implications for nanotube growth and offers rational ways to control their symmetry.
Researchers are using graphene to develop a new method for decoding DNA sequences, which could lead to more precise medical treatments. The technique involves passing DNA through a nanopore drilled into graphene, allowing scientists to read out the chemical bases along the strand as they pass through.
A Columbia University engineering team has discovered how pure graphene breaks under tensile stress, revealing a novel soft-mode phonon instability that leads to mechanical failure. This finding is significant for understanding the behavior of low-dimensional systems like graphene and could lead to new ways to engineer its properties.
Milan Begliarbekov, a doctoral candidate at Stevens Institute of Technology, has found unique applications for graphene. His research uses µ-Raman spectroscopy to differentiate between monolayer and bilayer graphene, and establishes a new signature of Klein tunneling in graphene heterojunctions.
AFOSR-funded physicist Colonel Scott Dudley praised the discovery, noting graphene is stronger than steel yet flexible and stretchable, with wide-ranging applications in electronics and sensors. The research has led to significant breakthroughs and continues to push the field forward.
Researchers at Rice University have developed a method to produce high-quality graphene using plain table sugar and other carbon-based substances. The process, which can be done in just one step, produces large-area sheets of graphene at low temperatures.
Empa researchers have successfully fabricated small fragments of graphene, known as nanographenes, using a surface chemical route. The reaction pathway consists of six steps with five intermediate products, which can be stabilized on semiconductor surfaces, enabling the fabrication of tailored nanographenes.
Researchers at Brown University discovered that grain boundaries in graphene do not compromise the material's strength. The critical bonds along these boundaries can be as strong as those found in pure graphene when tilted at specific angles, enabling the creation of larger sheets with improved properties.
Researchers at the University of Manchester have created fluorographene, a one-molecule-thick material similar to Teflon with chemical inertness and thermal stability. The team hopes to use it in electronics, such as LED devices and ultra-thin tunnel barriers, while retaining mechanical strength.
Researchers at the University of Warwick have discovered molecular hooks on Graphene Oxide that enable precise imaging and analysis of molecules using transmission electron microscopes. These hooks allow for high-contrast imaging and the study of molecule interactions with supporting graphene.
Researchers at Rensselaer Polytechnic Institute have developed a new method to tune the band gap of graphene using water. By exposing graphene to humidity, they created a band gap in the nanomaterial, opening the door to new graphene-based transistors and nanoelectronics.
A research team developed tools to study supercritical CO2's impact on minerals, which could be affected by stored carbon dioxide. The new high-pressure atomic force microscope can observe changes at the atomic scale, addressing a key question about the feasibility of carbon capture and storage.
Researchers at UC Riverside develop a graphene-based triple-mode amplifier that outperforms traditional semiconductors in terms of functionality and speed. This breakthrough has significant implications for applications such as Bluetooth headsets, RFID, and ZigBee devices.
Triple-mode transistors based on graphene can switch between positive and negative carriers, providing opportunities not possible with traditional single-transistor architectures. This property enables the transistor to be used in various applications such as wireless and audio signaling schemes.
Researchers successfully achieved 'tunneling spin injection' into graphene, increasing efficiency and enabling longer spin lifetimes. This breakthrough enables the development of a 'spin computer' with potential for faster and more energy-efficient computing.
Two social scientists are studying the pathways to commercialize graphene, examining strategies for research and development and fostering commercialization through external partnerships. The project aims to provide real-time insights into how nanotechnology research moves into early applications, addressing barriers and concerns.
Researchers at Georgia Institute of Technology developed a new templated growth technique for fabricating nanometer-scale graphene devices. The method involves etching patterns into silicon carbide surfaces to direct graphene growth, resulting in smooth-edged nanoribbons with controlled widths.
Researchers at Harvard University have demonstrated that graphene can act as an artificial membrane separating two liquid reservoirs, enabling the measurement of ion exchange and the detection of single molecules of DNA. The graphene membrane's atomic thickness makes it a novel electrical device with potential applications in chemical ...
Researchers have discovered a new phenomenon in graphene where electrons split into unexpected energy levels when exposed to extreme conditions. The discovery raises questions about the fundamental physics of graphene and its potential for powerful applications.
Researchers at Caltech have developed a simple technique using graphene to visualize the structure of molecules at the atomic scale. The technique reveals new details about how water coats surfaces, including its structure and properties.
Researchers at UCLA have overcome difficulties in integrating graphene into electronic devices, achieving the fastest graphene transistor to date with a cutoff frequency of up to 300 GHz. This breakthrough enables the development of high-speed radio-frequency electronics for applications in microwave communication and radar technologies.
Researchers used quantum molecular dynamics and transmission electron microscopy to discover an intermediate step in the cleaning process. Electron irradiation prevented loop formation, allowing for efficient edge cleaning and improving graphene's suitability for electronics.
The study found that energy states follow contours of constant electric potential, creating energy gaps within isolated patches on the surface. These gaps are due to a subtle interaction with the substrate, which consists of multilayer graphene grown on a silicon carbide wafer.