Graphene is a substance composed of pure carbon, with atoms arranged in a regular hexagonal pattern similar to graphite, but in a one-atom thick sheet. It is very light, with a 1-square-meter sheet weighing only 0.77 milligrams.
It is an allotrope of carbon whose structure is a single planar sheet of sp2-bonded carbon atoms, that are densely packed in a honeycomb crystal lattice. The term graphene was coined as a combination of graphite and the suffix -ene by Hanns-Peter Boehm, who described single-layer carbon foils in 1962. Graphene is most easily visualized as an atomic-scale chicken wire made of carbon atoms and their bonds. The crystalline or “flake” form of graphite consists of many graphene sheets stacked together.
The carbon-carbon bond length in graphene is about 0.142 nanometers. Graphene sheets stack to form graphite with an interplanar spacing of 0.335 nm. Graphene is the basic structural element of some carbon allotropes including graphite, charcoal, carbon nanotubes and fullerenes. It can also be considered as an indefinitely large aromatic molecule, the limiting case of the family of flat polycyclic aromatic hydrocarbons.
There is an analog of graphene composed of silicon called silicene.
The Nobel Prize in Physics for 2010 was awarded to Andre Geim and Konstantin Novoselov at the University of Manchester “for groundbreaking experiments regarding the two-dimensional material graphene”. In 2013, graphene researchers led by Prof. Jari Kinaret from Sweden’s Chalmers University, secured a €1 billion grant from the European Union.
Source: Wikipedia >>
Graphene: Thin as an atom, with amazing strength and electrical properties – it may be the scientific find of the century
How playing with sticky tape changed the world
Graphene, a wonder material that promises to transform the future, is already the stuff of scientific legend. As a piece of brilliant serendipity it stands alongside the accidental discovery of penicillin by Alexander Fleming – and it might prove just as valuable, writes By Steve Connor.
Two Russian-émigré scientists at the University of Manchester, Andrei Geim and Kostya Novoselov, were playing about with flakes of carbon graphite in an attempt to investigate its electrical properties when they decided to see if they could make thinner flakes with the help of sticky Scotch tape.
They used the tape to peel off a layer of graphite from its block and then repeatedly peeled off further layers from the original cleaved flake until they managed to get down to flakes that were only a few atoms thick. They soon realised that by repeatedly sticking and peeling back the Scotch tape they could get down to the thinnest of all possible layers, one atom thick – a material with unique and immensely interesting properties.
When the two scientists won their joint Nobel prize in physics in 2010 for their ground-breaking experiments, the Nobel committee made a point of citing the “playfulness” that was one of the hallmarks of the way they have worked together.
Playing about with Scotch tape on a Friday afternoon sounds a jokey thing to do, but it soon turned into a deadly serious game of scientific discovery which would have been impossible if not for the well-prepared minds of Geim and Novoselov.
“A playful idea is perfect to start things but then you need a really good scientific intuition that your playful experiment will lead to something, or it will stay as a joke for ever,” Novoselov says. “Joking for a week or two is the right way to go, but you don’t want to make your whole research into a joke.”
Geim, who is 15 years older than Novoselov and was once his PhD supervisor, has a reputation for playful experiments. He levitated a frog in 1997 to showcase his work in magnetism and invented a new kind of sticky tape based on the adhesive feet of Gecko lizards, which can walk up walls and hang upside down on ceilings.
The original idea of working with graphite was to see if it could be used as a transistor – the fundamental switching device at the heart of computing. In fact, Novoselov says, they had almost given up with graphite when they heard about how microscopy researchers working along the university corridor used Scotch tape to clean the mineral before putting it under the lens.
“It was not a new technique, and I’d heard of it before, but when you see it in front of you it makes it obvious what it can be used for,” Novoselov recalls.
Graphene, a two-dimensional crystal of pure carbon, is a superlative material. It is the thinnest and strongest substance known to science – about 100 times stronger than steel by weight. A square metre of graphene, a thousand times thinner than paper, made into a hammock would be strong enough to cradle a 4kg cat, but weigh no more than one of its whiskers. It is a good conductor of electricity, is stretchable and yet is almost transparent. It conducts heat better than any other known substance. It acts as a barrier to the smallest atom of gas – helium – and yet allows water vapour to pass through.
This particular property has allowed the two Russians to perform another playful experiment, this time in passive vodka distillation – water evaporates through a graphene membrane placed over a mug of watered-down vodka, leaving the concentrated alcohol behind.
The inventive step that made Geim and Novoselov into Nobel laureates was to find a way of transferring the ultra-thin flakes of graphene from Scotch tape to a silicon wafer, the material of microprocessors. Once they did this the extraordinary electrical properties of graphene could be witnessed and explored, including its “ghostly” quantum state when electrons start to behave weirdly as if these particles have no mass. “The excitement would exist even without these unusual properties because graphene is the first two-dimensional material. It seems obvious now because we can suspend it in the air and do almost anything with it, but at the beginning it was by no means obvious that it would be stable,” Novoselov says.
“And then on top of that there are other excitements such as the very unusual electronic properties that we’ve never come across before. Then there are the unusual optical properties, chemical properties and many more.
“We have a really unique opportunity here in that quite a few unusual properties are combined in one material; the strongest, the most flexible, the most stretchable, the most conductive, optically transparent and something which is a good gas barrier. So you can invent quite a few new applications that were not possible before,” he adds.
The potential uses for graphene appear almost limitless. They range from new types of flexible electronics that could be worn on clothes or folded up into a pocket, to a new generation of very small computers, hyper-efficient solar panels and super-fast mobile phones. Yet at the heart of graphene is a honeycomb structure of carbon atoms – described as “atomic chickenwire”. Carbon is the basic element of life, which means that graphene could be the focus of a new industrial revolution based on electronic components that are biodegradable and sustainable. If there was ever a building material for a new, green economy, graphene could be it. As a result, the Government has actively supported a new National Graphene Institute (NGI) in Manchester, which will be completed by 2015 at the cost of £61m, of which £38m is coming from government research councils.
The NGI, which will be built on the site of a Victorian gentleman’s club where Friedrich Engels once sipped aperitifs (presumably after working on the Communist Manifesto), is poised to reap the commercial spin-offs that are likely to tumble out of graphene research.
“The model is that we allow our scientists to work on the projects that they want to work on, and we put engineers from companies to work in the same labs,” Novoselov says. “If there is something interesting that the company believes should be pushed forward then there will be collaboration with the scientists to bring it to the next level,” he says.
Geim, who declined to be interviewed, is working closely with Novoselov on all aspects of the institute’s architecture as well as the way it will work to encourage both scientific discovery and its commercial exploitation. They both hope to foster an industrial revival to rival the one that began in this part of north-west England 200 years ago – but with carbon in the form of graphene rather than coal.
Wonder stuff: uses for graphene
Graphene could be used to desalinate seawater to make it drinkable. Scientists believe that passing seawater through graphene’s tiny pores, the crystal lattice could let water molecules through, while blocking out the atoms that make salt. Using a graphene filter, Lockheed hopes to transform salt water into drinking water by the end of the year.
Being both transparent and conductive, graphene could be perfect for the new generation of smartphones. Samsung are among the consumer electronics companies that are developing touchscreen interfaces.
It is hoped that graphene can replace silicon chips. Electronics firms are testing graphene in numerous electrical devices. IBM has already piloted computers that use the material to achieve the record-setting speed of 100GHz.
Satellites, planes and cars
Graphene has properties that provide light but super-strong composite materials for next-generation satellites, planes and cars. The new form of carbon could further reduce aircraft weight, subsequently cutting the burning of fuel and dumping of carbon in the atmosphere.
Scientists believe that graphene’s flexible nature may prove the ideal building material, with the trick being to incorporate it into a matrix like a polymer or a metal, where the load is borne by the graphene layer.
Graphene repels water and is highly conductive. This combination keeps steel from coming into contact with water and delays the electrochemical reactions that oxidize iron. New York scientists designed a polymer coating containing this form of carbon and found that it protected steel from rusting for up to a month.
Graphene foam can pick up small concentrations of the nitrates and ammonia found in explosives. A postage-size sensor developed in the US could soon be mandatory for bomb squads. Australian researchers found adding an equal amount of graphene and carbon nanotubes to a polymer produced a super-strong fibre that could be spun into fabric used to make bulletproof vests.
Graphene oxide can absorb radioactive waste. Researchers at Rice University and Lomonosov Moscow State University found that tiny bits of graphene oxide bind to radioactive contaminants, transforming them into large extractable clumps. This could help after nuclear accidents like the Fukushima disaster.
Article © Belfasttelegraph.co.uk
PS Graphene as Super-capacitor
That battery life video that had gone viral due to a recent post on UpWorthy (and which we told you about Tuesday) now has an update. We told you that researchers at Ric Kaner’s lab at UCLA had found a way to make a non-toxic, highly efficient energy storage medium out of pure carbon using absurdly simple technology. Today, we can report that the same team may well have found a way to make that process scale up to mass-production levels.
The recap: Graphene, a very simple carbon polymer, can be used as the basic component of a “supercapacitor” — an electrical power storage device that charges far more rapidly than chemical batteries. Unlike other supercapacitors, though, graphene’s structure also offers a high “energy density,” — it can hold a lot of electrons, meaning that it could conceivably rival or outperform batteries in the amount of charge it can hold. Kaner Lab researcher Maher El-Kady found a way to create sheets of graphene a single carbon atom thick by covering a plastic surface with graphite oxide solution and bombarding it with precisely controlled laser light.
English translation: He painted a DVD with a liquid carbon solution and stuck it into a standard-issue DVD burner.
The result: Absurdly cheap graphene sheets one atom thick, which held a surprising amount of charge without further modification.
That work was reported a year ago; we mentioned it due to the video virally making the rounds this week. Late Tuesday, UCLA announced that El-Kady and Kaner have a new article in press, in the upcoming issue of Nature Communications, describing a method by which El-Kady’s earlier, slightly homebrewed fabricating process shown in the video can be made more efficient, raising the possibility of mass production. As the authors say in their article abstract,
More than 100 micro-supercapacitors can be produced on a single disc in 30?min or less.
El-Kady and Kaner found a way to embed small electrodes within each graphene unit, and place the whole thing on a flexible substrate that allows the supercapacitor to be bent. The team is already claiming energy density comparable to existing thin-film lithium ion batteries.
In the video we shared Tuesday, Kaner says that this technology, if it pans out, offers possibilities like a smart phone getting a full day’s charge in a second or two, or an electric car reaching “full” in a minute. This week’s press release from UCLA offers other intriguing possibilities:
The new micro-supercapacitors are also highly bendable and twistable, making them potentially useful as energy-storage devices in flexible electronics like roll-up displays and TVs, e-paper, and even wearable electronics. The researchers showed the utility of their new laser-scribed graphene micro-supercapacitor in an all-solid form, which would enable any new device incorporating them to be more easily shaped and flexible. The micro-supercapacitors can also be fabricated directly on a chip using the same technique, making them highly useful for integration into micro-electromechanical systems (MEMS) or complementary metal-oxide-semiconductors (CMOS). As they can be directly integrated on-chip, these micro-supercapacitors may help to better extract energy from solar, mechanical and thermal sources and thus make more efficient self-powered systems. They could also be fabricated on the backside of solar cells in both portable devices and rooftop installations to store power generated during the day for use after sundown, helping to provide electricity around the clock when connection to the grid is not possible.
Kaner says that his lab is now looking for partners in industry that can help make these graphene supercapacitors on an industrial scale.
It’s tempting to be cynical about the possibility of a magic bullet energy storage solution; such a breakthrough could solve any number of problems from annoying dead smart phones to two-hour charge times for electric cars to an inefficient power distribution grid, and it’s easy to really want this kind of thing to be true. Plenty of seemingly promising technical innovations in the last few years haven’t lived up to their hopeful hype. There’s always the chance that further study will reveal a fatal flaw in graphene supercapacitor technology. But for the time being, ReWire officially has its hopes up, at least a little.