Browse Topic: Graphene

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Experimental Modal Analysis Study on Graphene filled SBR2021-28-022510/01/2021
Rubbers are widely used in many engineering applications such as tubes, timing belt, tyre etc. Apart from its functional use, it can also be used as damping material in many applications in order to dampen the vibrations transmitted from one structure to other. The present research work focus on the development of CB filled SBR and Graphene filled SBR. Both rubber samples were investigated for its mechanical properties such as hardness and tensile strength. Experimental modal analysis was also done to examine the dynamic characteristics such as damping and natural frequency along with its mode shapes for the prepared samples and compared. It is observed from the results that the inclusion of graphene in SBR improved its vibration characteristics in addition to the improvement of mechanical properties.
Natarajan, Ravikumar, S, Rizwan Asif, C, Sivakumar, Manohar, D Murali
Graphene “Nano-Origami” Creates Tiny MicrochipsTBMG-3960408/01/2021
Tiny microchips can be made from graphene and other two-dimensional (2D) materials using a form of “nano-origami.” By creating kinks in the structure of graphene, researchers made the nanomaterial behave like a transistor and showed that when a strip of graphene is crinkled in this way, it can behave like a microchip that is around 100 times smaller than conventional microchips.
Wearable, Stretchable Gas SensorTBMG-3850702/01/2021
A team has developed and tested a stretchable, wearable gas sensor for environmental sensing. It combines a newly developed laser-induced graphene foam material with a unique form of molybdenum disulfide and reduced-graphene oxide nanocomposites. The researchers were interested in seeing how different morphologies, or shapes, of the gas-sensitive nanocomposites affect the sensitivity of the material to detecting nitrogen dioxide molecules at very low concentration. To change the morphology, they packed a container with very finely ground salt crystals.
Circuit Generates Clean, Limitless Power from GrapheneTBMG-3833001/01/2021
An energy-harvesting circuit based on graphene could be incorporated into a chip to provide clean, limitless, low-voltage power for small devices or sensors. The findings show that freestanding graphene — a single layer of carbon atoms — ripples and buckles in a way that holds promise for energy harvesting.
Energy-Harvesting Device Turns Wi-Fi Signals into Usable PowerTBMG-3833401/01/2021
Any device that sends out a Wi-Fi signal also emits terahertz waves — electromagnetic waves with a frequency somewhere between microwaves and infrared light. These high-frequency radiation waves, known as T-rays, are also produced by almost anything that registers a temperature including human bodies and inanimate objects. If harnessed, the concentrated power of terahertz waves could potentially serve as an alternate energy source; however, to date, terahertz waves are wasted energy, as there has been no practical way to capture and convert them into any usable form.
Technique Mass-Produces Cell-Sized RobotsTBMG-3765109/01/2020
A method was developed for massproducing tiny robots no bigger than a cell. The microscopic devices, called “syncells” (short for synthetic cells), might eventually be used to monitor conditions inside an oil or gas pipeline, or to search out disease while floating through the bloodstream.
Graphene Smart Textiles for Heat-Adaptive ClothingTBMG-3745608/01/2020
Scientists have created a prototype garment to demonstrate dynamic thermal radiation control within a piece of clothing by utilizing the thermal properties and flexibility of graphene. The development also opens the door to new applications such as interactive infrared displays and covert infrared communication on textiles.
Graphene Device with Superconducting, Insulating, and Magnetic PropertiesTBMG-3703206/01/2020
Thinner than a single strand of DNA yet 200 times stronger than steel, graphene is an excellent conductor of electricity and heat and it can conform to any number of shapes, from an ultrathin 2D sheet to an electronic circuit.
Nano-Infused Ceramic Can Report its own HealthTBMG-3683005/01/2020
A ceramic was developed that becomes more electrically conductive under elastic strain and less conductive under plastic strain. The material could lead to a new generation of sensors embedded into structures like buildings, bridges, and aircraft able to monitor their own health.
Recent advances in swelling resistance of graphene-based rubber compounds2020-01-076904/14/2020
Recently, graphene has attracted both academic and industrial interest because it can produce a dramatic improvement in properties at very low filler content. This review will focus on the latest studies and recent progress in the swelling resistance of rubber compounds due to the addition of graphene and its derivatives. This work will present the state-of-the-art in this subject area and will highlight the advantages and current limitations of graphene for potential future researches.
Polkowski, Rodrigo, Herbert, Cristiano, Kiziltas, Alper, Souza, Jodalva, Aguiar, Angelo, Goncalves, Cristiane, Almeida, Oberti
Cryogenic Near-Field Optical Microscope Images Dynamics of GrapheneTBMG-3639604/01/2020
As electronic devices and circuits shrink into the nanoscale, the ability to transfer data on a chip at low power with little energy loss is becoming a critical challenge. Over the past decade, squeezing light into tiny devices and circuits has been a major goal of nanophotonics researchers. Electronic oscillations at the surface of metals, known as surface plasmon polaritons or plasmons, have become an intense area of focus. Plasmons are hybrids of light (photons) and electrons in a metal. If this nanolight can be harnessed, researchers can improve sensing, subwave-length waveguiding, and optical transmission of signals.
Graphene Field Effect Transistors for Radiation Detection (GFET-RS)TBMG-3514809/01/2019
NASA Goddard Space Flight Center developed novel transistor technology based on a single graphene layer coupled to a radiation absorber substrate. Unlike conventional charge-sensing detectors, the GFET-RS utilizes the sensitive dependence of graphene conductance on local change of the electric field, which can be induced by interaction of radiation with the underlying absorber substrate.
Graphene Lid Extends Photoemission Electron Microscopy to LiquidsTBMG-3475307/01/2019
By capping liquids with graphene (an ultrathin sheet of pure carbon), researchers can easily image and analyze liquid interfaces and the surface of nanometer-scale objects immersed in liquids. In the imaging technique known as photoemission electron microscopy (PEEM), ultraviolet light or X-rays bombard a sample, stimulating the material to release electrons from a region at or just beneath its surface. Electric fields act as lenses, focusing the emitted electrons to create an image.
Graphene Coating Takes Oxygen Out of Lithium Battery FiresTBMG-3460106/01/2019
Lithium batteries allow electric vehicles to travel several hundred miles on one charge. Their capacity for energy storage is well known — so is their tendency to occasionally catch on fire. This “thermal runaway” occurs most frequently when the batteries overheat or cycle rapidly.
Graphene-Silicon Devices for Optoelectronics ApplicationsTBMG-3462806/01/2019
Silicon is a naturally occurring material commonly used as a semiconductor in electronic devices; however, researchers have exhausted the potential of devices with semiconductors made of silicon only. These devices are limited by silicon’s carrier mobility — the speed at which a charge moves through the material — and indirect bandgap, which limits its ability to release and absorb light.
Waterproof Graphene Electronic CircuitsTBMG-3438705/01/2019
The many applications of graphene, an atomically-thin sheet of carbon atoms with extraordinary conductivity and mechanical properties, include the manufacture of sensors. These transform environmental parameters into electrical signals that can be processed and measured with a computer. Due to their two-dimensional structure, graphene-based sensors are extremely sensitive and promise good performance at low manufacturing cost.
Using Graphene to Detect ALS and Other Neurodegenerative DiseasesTBMG-3372402/01/2019
The wonders of graphene are numerous. It can enable flexible electronic components, enhance solar cell capacity, filter the finest subatomic particles, and revolutionize batteries. Now, the “supermaterial” may one day be used to test for amyotrophic lateral sclerosis, or ALS — a progressive, neurodegenerative disease that is diagnosed mostly by ruling out other disorders, according to new research from the University of Illinois at Chicago published in ACS Applied Materials & Interfaces.
Sandwiching Materials in NanoelectronicsTBMG-3337612/01/2018
Many of today's silicon-based electronic components contain 2D materials such as graphene. Incorporating 2D materials like graphene — which is composed of a single-atom-thick layer of carbon atoms — into these components allows them to be several orders of magnitude smaller than if they were made with conventional 3D materials. In addition, 2D materials also enable other unique functionalities. But nanoelectronic components with 2D materials have an Achilles’ heel — they are prone to overheating. This is because of poor heat conductance from 2D materials to the silicon base.
One-Dimensional Material with High Current DensityTBMG-3323511/01/2018
Current density is the amount of electrical current per cross-sectional area at a given point. As transistors in integrated circuits become smaller and smaller, they need higher and higher current densities to perform at the desired level. Most conventional electrical conductors, such as copper, tend to break due to overheating or other factors at high current densities, presenting a barrier to creating increasingly small components.
A New Generation of Artificial Retinas Based on 2D MaterialsTBMG-3385910/01/2018
University of Texas at Austin, Austin, TX Seoul National University, Seoul, South Korea
Low Power Optical Phase Array Using Graphene on Silicon Photonics18AERP09_0809/01/2018
Electrostatic doping of 2D materials embedded in waveguides could enable ultrafast devices with unprecedented power. Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio Despite enormous advances in integrated photonics over the last decade, an efficient integrated phase delay remains to be demonstrated. This problem is fundamental - most monolithic thin film deposition relies on centro symmetric materials (such as silicon, silicon dioxide, silicon nitride), which by definition do not have an electro-optic effect. Such materials have been shown to be excellent transparent materials, however they are either optically passive, or rely on very small plasma dispersion effect or power-hungry thermo-optic effect for tunability. These phase change materials have losses associated due to heating or carrier injection in the waveguides. This research shows that graphene can be used to provide electro-optic properties to traditionally passive optical materials. Graphene is a
Datta, Ipshita, Lee, Brian, Lipson, Michael
Faster, More Efficient Information ProcessingTBMG-3286009/01/2018
For decades, computer chips have been shrinking thanks to a steady stream of technological improvements in processing density. Experts have, however, been warning that we'll soon reach the end of the trend known as Moore's Law, in which the number of transistors per square inch on integrated circuits doubles every year. In order to continue improving chip performance, either the material the transistors are made of — from silicon, to carbon nanotubes or graphene — or how current materials store and process information would need to change.
Low Power Optical Phase Array Using Graphene on Silicon PhotonicsTBMG-3290009/01/2018
Despite enormous advances in integrated photonics over the last decade, an efficient integrated phase delay remains to be demonstrated. This problem is fundamental – most monolithic thin film deposition relies on centro symmetric materials (such as silicon, silicon dioxide, silicon nitride), which by definition do not have an electro-optic effect. Such materials have been shown to be excellent transparent materials, however they are either optically passive, or rely on very small plasma dispersion effect or power-hungry thermo-optic effect for tunability. These phase change materials have losses associated due to heating or carrier injection in the waveguides. This research shows that graphene can be used to provide electro-optic properties to traditionally passive optical materials.
Flexible, Water-Repellent Graphene Circuits for Washable ElectronicsTBMG-2857103/01/2018
New graphene printing technology can produce electronic circuits that are low-cost, flexible, highly conductive, and water-repellent. Low-cost, inkjet-printed graphene can be tuned with a laser to make functional materials.
Rubber Material Enables Scratch-Proof SurfacesTBMG-2798012/01/2017
The slippery state caused by water or oil is called superlubricity — where there is basically no friction on a surface. In graphene, this superlubricity state comes from atomic orbitals that compose carbon atoms. To generate friction, some orbitals must overlap and heat, or some energy must be released. Graphene does not require this process; rather, it spontaneously slides on top of other layers, but does not release heat. Graphene, which is 300 times stronger than steel, becomes mechanically weaker and can easily break.
Forging Graphene into Three-Dimensional ShapesTBMG-2780611/01/2017
Graphene is a relative to graphite, which consists of millions of layers of graphene, and can be found in common pencil tips. Since graphene was isolated in 2004, researchers have learned to routinely produce and handle it. Graphene can be used to make electronic and optoelectronic devices such as transistors, photodetectors, and sensors.
Using Microwaves to Produce High-Quality GrapheneTBMG-2727808/01/2017
Engineers have developed a simple method for producing high-quality graphene that can be used in next-generation electronic and energy devices. The method essentially bakes the compound in a microwave oven.
Products of Tomorrow: July 2017TBMG-2722107/01/2017
This column presents technologies that have applications in commercial areas, possibly creating the products of tomorrow. To learn more about each technology, see the contact information provided for that innovation.
Laser-Induced Graphene Enables Intelligent Artificial ThroatTBMG-2689105/01/2017
Researchers at Tsinghua University have developed an intelligent artificial throat based on laser-induced graphene. The intelligent device both detects and generates sound in a single unit. The biocompatible artificial throat, which attaches to the larynx, is designed to produce recognizable and controllable sounds. According to the researchers, led by Prof. Tian-Ling Ren in the university's Institute of Microelectronics, the device is a new application of graphene in the field of wearable electronics and is expected to have a significant impact in biology, speech recognition, and other fields.
New Graphene-Based System Could Help ‘See’ Electrical Signaling in Heart and Nerve CellsTBMG-2638102/01/2017
Scientists have enlisted the exotic properties of graphene, a one-atom-thick layer of carbon, to function like the film of an incredibly sensitive camera system in visually mapping tiny electric fields in a liquid. Researchers hope the new method will allow more extensive and precise imaging of the electrical signaling networks in hearts and brains.
3D Graphene Shows Promise for Bone ImplantsTBMG-2573011/01/2016
Flakes of graphene welded together into solid materials may be suitable for bone implants, according to a study led by Rice University scientists. The Rice lab of materials scientist Pulickel Ajayan and colleagues in Texas, Brazil, and India used spark plasma sintering to weld flakes of graphene oxide into porous solids that compare favorably with the mechanical properties and biocompatibility of titanium, a standard bone-replacement material.
Sucrose-Treated Carbon Nanotube and Graphene Yarns and SheetsTBMG-2496107/01/2016
NASA’s Langley Research Center has developed a method to consolidate carbon nanotube yarns and woven sheets and graphene sheets via the dehydration of sucrose. The resulting materials are lightweight and high strength. Sucrose is relatively inexpensive and readily available; therefore the process is cost-effective.
Freezing Graphene for 3D PrintingTBMG-2465605/01/2016
Graphene, which was discovered in 2004, is 1 million times thinner than a human hair, 300 times stronger than steel, and is the best known conductor of heat and electricity. Researchers at the University of Buffalo (UB), along with colleagues at Kansas State University and the Harbin Institute of Technology in China, say that these qualities could be used to improve medical diagnostic devices, make computers faster, and batteries more powerful, among other things. But, they say that the material is very light and difficult to manipulate beyond its two-dimensional form.
Ultrasensitive Sensors Made from Boron-Doped GrapheneTBMG-2358712/10/2015
An international team of researchers, led by Penn State, has developed ultrasensitive gas sensors based on the infusion of boron atoms into the tightly bound matrix of carbon atoms known as graphene. The group is composed of researchers from six countries and includes the 2010 Noble laureate and graphene pioneer Konstantin Novoselov, and Morinobu Endo, the discoverer of carbon nanotubes.
Products of Tomorrow: December 2015TBMG-2354212/01/2015
The technologies NASA develops don’t just blast off into space. They also improve our lives here on Earth. Life-saving search-and-rescue tools, implantable medical devices, advances in commercial aircraft safety, increased accuracy in weather forecasting, and the miniature cameras in our cellphones are just some of the examples of NASA-developed technology used in products today.
Could Black Phosphorus be the Next Silicon?TBMG-2274808/14/2015
As scientists continue to hunt for a material that will make it possible to pack more transistors on a chip, new research from McGill University and Université de Montréal adds to evidence that black phosphorus could emerge as a strong candidate. In a recent study, researchers reported that when electrons move in a phosphorus transistor, they do so only in two dimensions. This finding suggests that black phosphorus could help engineers surmount one of the big challenges for future electronics – designing energy-efficient transistors.
New Semiconductor Material Beats GrapheneTBMG-2091811/01/2014
A team of scientists at the University of California, Santa Barbara, have developed an atomically thin, 2D, ultrasensitive semiconductor material for biosensing uses.
Advancing Medical Imaging with Ultra-Thin DetectorTBMG-2091511/01/2014
Researchers at the University of Maryland (UMD), College Park, say that their work could lead to a generation of light detectors that can see below the surface of bodies. Using graphene, their prototype detector is able to view an extremely broad band of wavelengths, including terahertz waves, which fall between microwaves and infrared waves. The light in terahertz wavelengths can pass through materials that we normally think of as opaque, such as skin.
New Technology to Improve Heat FlowTBMG-1930004/01/2014
Mechanical engineers at Purdue University in West Lafayette IN, have proposed a new technology that, they say, could control the flow of heat the way electronic devices control electrical current, an advance that could have applications in a diverse range of fields from electronics to textiles.
Conductive Carbon Nanotube Inks for Use with Desktop Inkjet Printing TechnologyTBMG-1677807/01/2013
Inkjet printing is a common commercial process. In addition to the familiar use in printing documents from computers, it is also used in some industrial applications. For example, wire manufacturers are required by law to print the wire type, gauge, and safety information on the exterior of each foot of manufactured wire, and this is typically done with inkjet or laser printers.
Graphene-Based Reversible Nano-Switch/ Sensor Schottky DiodeTBMG-861410/01/2010
This proof-of-concept device consists of a thin film of graphene deposited on an electrodized doped silicon wafer. The graphene film acts as a conductive path between a gold electrode deposited on top of a silicon dioxide layer and the reversible side of the silicon wafer, so as to form a Schottky diode. By virtue of the two-dimensional nature of graphene, this device has extreme sensitivity to different gaseous species, thereby serving as a building block for a volatile species sensor, with the attribute of having reversibility properties. That is, the sensor cycles between active and passive sensing states in response to the presence or absence of the gaseous species.
How to Increase Specific Energy of Electrochemical CapacitorsTP-AAB-AABC_EUROPE_2011_1906/10/2009
Energy increase by voltage window: -Aging phenomena at elevated voltages for today's materials -- Balancing of electrode mass; - Use special materials which show higher stability -- Carbon nanotubes -- Ionic Liquids as electrolyte. Energy increase by capacitance: - Graphite oxide and graphene -- Partially reduced GOx; Capacitor - Battery Hybrids
Kotz, Rudiger
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