Graphene oxide nanosheets could help bring lithium-metal batteries to market
Researchers at University of Illinois Chicago developed graphene-oxide coated nanosheets to regulate lithium deposition, extending battery life and safety
Graphene
Articles tagged with Graphene
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Graphene finds new application as non-toxic, anti-static hair dye
A Northwestern University team has developed a new hair dye using graphene that is non-toxic and non-damaging to hair. The dye works as well as commercial permanent dyes without chemically altering hairs, and it also offers anti-static properties.
A new use for graphene: Making better hair dyes
Researchers have developed a graphene-based hair dye that adheres to the surface of hair, forming a coating resistant to at least 30 washes without chemicals. This coating also dissipates static electricity, eliminating flyaways.
Graphene flakes for future transistors
Researchers have discovered graphene nanoflakes that can exploit quantum effects to modulate current flow. The flakes also exhibit new magnetic properties, enabling the creation of spin currents and potential applications in spintronics.
Study IDs 'white graphene' architecture with unprecedented hydrogen storage capacity
Researchers at Rice University have developed a new 'white graphene' architecture that can store hydrogen with unprecedented capacity in boron nitride nanomaterials. The optimal design features a specific spacing and arrangement of boron nitride sheets and pillars, resulting in improved hydrogen absorption and release capabilities.
Method to grow large single-crystal graphene could advance scalable 2-D materials
A new technique allows for the growth of large, single-crystal-like graphene films over a foot long, enabling high-quality two-dimensional materials necessary for practical applications. The novel approach harnesses an evolutionary 'survival of the fittest' competition among crystals to produce uniform and robust graphene.
Super sniffer: Dog's nose inspires new gas sensor materials
Researchers have developed graphene-based nanoscrolls with a large surface area, stability at high temperatures and durability. The material mimics the capillary structure in a dog's nose to detect odors at extremely low concentrations.
Insulator or superconductor? Physicists find graphene is both
Researchers have found that graphene can be tuned to behave as an insulator or a superconductor, exhibiting unusual electronic properties. By creating a 'superlattice' of stacked graphene sheets, the team demonstrated intrinsic superconductivity in pure carbon-based material.
New graphene laser technique opens door for edible electronics
Scientists have developed a way to write graphene patterns onto virtually any surface, including food, using a new laser technique. This technology could enable edible electronics that track food origin, storage, and safety, as well as detect harmful organisms like E. coli.
Rice U. sleuths find metal in 'metal-free' catalysts
Researchers at Rice University have found that graphene catalysts contain trace amounts of manganese, which activates the oxygen reduction reaction and improves fuel-cell efficiency. The study used inductively coupled plasma mass spectrometry to detect manganese atoms in samples made by the Rice lab.
Reinventing the inductor
The University of California - Santa Barbara team designed a new spiral inductor made of multiple layers of graphene, which offers one-and-a-half times the inductance density of traditional inductors. This innovative design enables a one-third reduction in size while maintaining high efficiency.
Researchers achieve 'Olympic ring' molecule breakthrough just in time for Winter Games
Researchers at Florida State University have developed a new strategy for synthesizing olympicene, a highly versatile molecule with potential applications in nanoscale materials. The breakthrough, published in Angewandte Chemie, enables the production of structurally precise carbon-rich nanostructures.
Tiny membrane key to safe drinking water
CSIRO scientists have developed a new filtering technique using Graphair that can remove almost all contaminants from water in a single step. The breakthrough technology has the potential to provide clean drinking water for millions of people worldwide who currently lack access to safe drinking water.
Graphene on toast, anyone?
Rice University scientists have developed a technique to write graphene patterns onto various materials, including food, paper, and cloth. The new method uses laser-induced graphene (LIG) to create conductive identification tags and sensors that can be embedded into products.
Water-soluble warped nanographene
Researchers have synthesized a water-soluble warped nanographene that exhibits photodynamic properties, killing human cells upon irradiation. The material's biocompatibility and fluorescence make it suitable for bioimaging and potential therapeutic applications.
Stacking on the graphene
Researchers at Tohoku University have fabricated two types of trilayer graphene with different electrical properties. The ABA-stacked graphene exhibits excellent electrical conductivity, while the ABC-stacked graphene displays semi-conducting properties. These findings hold implications for the development of novel electronic devices.
A new radiation detector made from graphene
Researchers have created a graphene-based radiation detector with a fast response time and the ability to work over a wide range of temperatures. The device exploits graphene's thermoelectric properties, generating an electric field that provides a direct measurement of radiation.
Clemson researchers blaze new ground in wireless energy generation
Researchers at Clemson University have developed a wireless energy generation device called W-TENG, which generates electricity from motion and vibrations. The device uses graphene-PLA fiber and can generate enough voltage to power standard electrical outlets or store energy wirelessly in capacitors.
Adding graphene girders to silicon electrodes could double the life of lithium batteries
Researchers at the University of Warwick have discovered a new approach to replace graphite in lithium-ion batteries using silicon reinforced with graphene girders. This could more than double the battery's life and increase its capacity.
Engineers develop flexible, water-repellent graphene circuits for washable electronics
Researchers at Iowa State University have developed a new graphene printing technology that produces electronic circuits with low cost, flexibility, and conductivity. The technology uses laser processing to create water-repelling surfaces on graphene flakes, opening up possibilities for self-cleaning wearable electronics and sensors.
Using crumpled graphene balls to make better batteries
Northwestern University researchers have created a new battery using crumpled graphene balls, which can accommodate fluctuation of lithium as it cycles between the anode and cathode. This approach avoids lithium dendrite growth, increasing battery performance and capacity.
Physicists succeed in measuring mechanical properties of 2-D monolayer materials
Researchers at Saarland University successfully measured the mechanical properties of free-standing single-atom-thick graphene membranes. The study provides direct evidence for the unique mechanical stability of these materials, which is crucial for their potential applications in various technological sectors.
Potentially life-saving health monitor technology designed by Sussex University physicists
Physicists at the University of Sussex have developed a new, affordable, and non-invasive wearable health monitor that can detect heart and breathing abnormalities in babies. The technology uses graphene-based liquid sensors to track vital signs wirelessly.
Engineers make wearable sensors for plants, enabling measurements of water use in crops
Engineers at Iowa State University have developed a new type of wearable sensor for plants, using graphene technology to measure water use in crops. The sensors are made by patterning and transferring graphene-based nanomaterials onto tape, allowing for precise measurements of transpiration from leaves.
Electronically-smooth '3-D graphene': A bright future for trisodium bismuthide
Trisodium bismuthide (Na3Bi) has been found to have an electronically smooth nature similar to graphene, allowing it to maintain high electron mobility. This discovery opens up possibilities for the advancement of topological materials and their applications in electronics.
Study resolves controversy about electron structure of defects in graphene
Researchers Ana María Valencia García and Marília Junqueira Caldas resolved a longstanding controversy about the calculation of defect electronic structures in graphene. They used a hybrid functional method, which yielded results compatible with experimental data, resolving divergences between different simulation methods.
Process to transition two-layer graphene into diamond-hard material on impact discovered
Researchers at CUNY's Advanced Science Research Center discovered a process to create a diamond-like material from two-layer graphene that becomes harder than diamond upon impact. This innovation has potential applications in wear-resistant protective coatings and ultra-light bullet-proof films.
Fast flowing heat in layered material heterostructures
Researchers detected graphene's out-of-plane heat transfer in van der Waals heterostructures, with implications for ultra-fast photodetectors and optoelectronic device design. The phenomenon relies on hot electrons and hyperbolic phonons in the hBN layer.
Getting under graphite's skin:
Scientists have discovered a new process to layer metals under graphite, leading to unique mesas with potential applications in quantum computing and sensing. The formation of these structures could enable controlled magnetic and electronic properties.
Graphene in zero G promises success in space
The Graphene Flagship has successfully tested graphene for two space-related applications: loop heat pipes and solar sails. The experiments, conducted in microgravity, showed excellent thermal properties and radiation pressure behavior, paving the way for a commercial product.
Columbia engineers create artificial graphene in a nanofabricated semiconductor structure
Researchers have successfully engineered artificial graphene in a nanofabricated semiconductor structure, offering more versatile properties than natural graphene. This breakthrough could lead to the development of new electronic switches, transistors, and storage methods based on exotic quantum mechanical states.
Graphene spin transport takes a step forward towards applications
Researchers predict and demonstrate a giant spin anisotropy in graphene, paving the way for new spintronic logic devices. This phenomenon enables control over the lifetime of different spin orientations in graphene.
UCLA chemists synthesize narrow ribbons of graphene using only light and heat
Researchers develop new method to produce nanoribbons of graphene, essential for smaller electronic devices. The process uses ultraviolet light and 600-degree heat to create narrow strips of graphene with a bandgap.
Researchers develop graphene nano 'tweezers' that can grab individual biomolecules
Researchers have developed graphene nano tweezers that can efficiently trap individual biomolecules, opening up new possibilities for point-of-care diagnostics. The technology has the potential to be miniaturized into a single microchip and operate on portable devices like smartphones.
Professor Rodney S. Ruoff wins prestigious James C. McGroddy Prize
Rodney S. Ruoff, a renowned researcher at UNIST, has been awarded the James C. McGroddy Prize for his groundbreaking work on scalable synthesis and applications of graphene and its derivatives. With over 141,000 citations, Ruoff is considered one of the most prolific researchers in the field.
Fast flowing heat in graphene heterostructures
Scientists have successfully observed and followed real-time heat transport in van der Waals stacks, where graphene is encapsulated by hexagonal BN. The heat actually flows to the surrounding hBN sheets on an ultrafast timescale of picoseconds, dominating competing heat transfer processes.
A transistor of graphene nanoribbons
Researchers have successfully grown graphene nanoribbons with a regular armchair edge, exhibiting a precisely defined energy gap. This enabled the integration of these structures into nanotransistors, overcoming previous challenges related to dielectric layers and ribbon alignment.
Ultrathin and flat graphene metalenses gain morace properties
Researchers have developed ultra-thin and flat graphene metalenses that can concentrate terahertz beams to a spot, flip their polarization and modulate their intensity. These devices have the potential to revolutionize applications such as amplitude tunable lenses, lasers and dynamic holography.
Fully integrated circuits printed directly onto fabric
Scientists have developed a method to print electronic circuits on fabric using graphene-based inks, creating flexible, washable, and breathable wearable devices. The technology has the potential to revolutionize the textile industry with applications in healthcare, energy harvesting, and fashion.
Two-dimensional materials unlock the path to ultra-low-power transistors
Researchers discovered a new route to ultra-low-power transistors using graphene-based composite materials, achieving fine electrical control over the electron's spin. The discovery has the potential to lead to much-needed low-energy consumption electronics.
Wrinkles give heat a jolt in pillared graphene
Pillared graphene's thermal transport was found to be faster with wrinkles due to reduced phonon scattering. The optimal configuration involves three octagons instead of six heptagons, facilitating a smoother turn without significantly stressing the graphene.
Graphene enables high-speed electronics on flexible materials
Researchers at Chalmers University have developed a flexible terahertz detector using graphene transistors on plastic substrates. The device detects signals in the frequency range of 330 to 500 gigahertz, opening up various applications including imaging sensors and wireless communications.
Sussex physicists have breakthrough on brittle smart phone screens
Researchers at the University of Sussex have created a new method for making smart phone touch screens that are cheaper, less brittle, and more environmentally friendly. The breakthrough involves combining silver nanowires with graphene to create a hybrid material that matches existing technologies at a fraction of the cost.
NASA Goddard announces Innovator of the Year
Mahmooda Sultana, a NASA research engineer, has been named IRAD Innovator of the Year for her groundbreaking work on nanomaterials and detectors. She is expanding her research to develop quantum-dot technology and 3-D printed sensor platforms.
Taming 'wild' electrons in graphene
Researchers successfully controlled electrons in graphene using a high-tech microscope, paving the way for novel electronic devices. This breakthrough could lead to ultra-fast transport of electrons with low energy loss in applications such as transistors and sensors.
Study: Why lab researchers should talk with industry counterparts
A study reveals that lab researchers should engage with industry counterparts to better understand the needs and challenges of real-world applications. This approach helped researchers adjust their focus and develop a potentially more useful set of applications for their work. By bridging the gap between research and commercialization,...
Columbia researchers observe exotic quantum particle in bilayer graphene
Researchers at Columbia University have observed the even-denominator fractional quantum Hall state in bilayer graphene, surviving to much higher temperatures than previously thought. This discovery opens the door to new experimental tools and may finally solve the mystery of this phenomenon.
Pressure between layers of stacked graphene oxide nanosheets increases with heat
Researchers at Kumamoto University discovered that pressure can be generated by stacking graphene oxide nanosheets and that this pressure increases with heat treatment. The study found a maximum pressure of 38 x 10^6 Pa, which can be adjusted by changing the heat treatment temperature.
Perovskite solar cells reach record long-term stability, efficiency over 20 percent
Researchers have developed a new method to deposit CuSCN layers on perovskite films, resulting in stabilized power-conversion efficiencies exceeding 20%. The introduction of a thin spacer layer of reduced graphene oxide allows the cells to achieve excellent operational stability, retaining over 95% of their initial efficiency.
Finding 2-D materials to make batteries cheaper, better
Researchers at the University of Illinois Chicago are working on discovering new 2D materials to manufacture improved and cost-effective batteries. The goal is to increase battery efficiency by about 1,000 times, enabling sustainable energy generation, chemical manufacturing, and pollution removal.
Graphene forged into three-dimensional shapes
Researchers from Finland and Taiwan have successfully fabricated three-dimensional graphene structures using optical forging, a technique that utilizes laser light to shape the material. The resulting graphene objects exhibit unique electronic and optical properties, opening up new possibilities for graphene-based devices.
The fastest light-driven current source
Researchers from FAU have successfully controlled electronic current in graphene using a single laser pulse within a femtosecond, generating a current that is more than a thousand times faster than the most efficient transistors today. The method uses light waves to regulate electron movement and generate electricity.
Naked molecules dancing in liquid become visible
Researchers at IBS Institute for Basic Science observed polymers in liquid inside graphene pockets without staining, revealing their dynamic movement. The study paves the way for observing life's building blocks and self-assembly of materials.
Graphene and other carbon nanomaterials can replace scarce metals
Researchers at Chalmers University of Technology found potential technology-based solutions to replace 13 out of 14 scarce metals with carbon nanomaterials. Carbon nanomaterials, such as graphene, have similar properties to metals and can be used in various applications, including electronics and plastics.
New quantum phenomena in graphene superlattices
Researchers have reported a new type of quantum oscillation in graphene superlattices, observable at high temperature and on the mesoscale. This phenomenon sheds light on Hofstadter's butterfly and enables tuning of electronic materials properties.
Tough stuff: Spider silk enhanced with graphene-based materials
Researchers enhanced spider silk with graphene-based materials, boosting its mechanical properties by up to three times the strength and ten times the toughness. The modified silks show promising applications in high-performance or biodegradable textiles such as parachutes or medical dressings.
Graphene based terahertz absorbers
Researchers have created a terahertz saturable absorber using graphene produced by liquid phase exfoliation, enabling ultrafast lasers with high modulation. The devices have great potential for applications such as time-resolved spectroscopy of gases and molecules, quantum information, and ultra-high speed communication.
Hollow atoms: The consequences of an underestimated effect
Hollow atoms, created in labs, have electrons that can quickly lose energy through interatomic coulomb decay. This effect is important for understanding the helpful effects of ionizing radiation in cancer therapy and causing DNA damage.
Research team discovers 'rubber material' that could lead to scratch-proof paint for car
Researchers have found a superlubricity in graphene, where friction vanishes, and hexagonal boron nitride layers are as strong as diamond but more flexible. The unique qualities of these materials could be used to create scratch-proof paint for cars and flexible smart devices.
UConn chemist synthesizes pure graphene
UConn chemistry professor Doug Adamson has patented a process to exfoliate pure graphene, a substance that is 100 times stronger than steel. His technology uses a thermodynamically driven approach to un-stack graphite into its constituent graphene sheets.