Fluorographene: The world's thinnest insulator

November 4, 2010
Fluorographene: The world's thinnest insulator

(PhysOrg.com) -- The remarkable properties of graphene and Teflon have been combined in a new material by the winners of this year’s Nobel Prize for Physics.

Kostya Novoselov and Andre Geim, working at the University of Manchester, UK, first isolated graphene in 2004. It was a tricky task, as one would expect if a Nobel Prize is among the rewards, even if it did involve using humble adhesive tape to peel away surfaces one layer at a time. They found graphene to be the thinnest and strongest form of carbon, and that it could conduct heat better than any other known material. As a conductor of electricity, it performs just as well as copper. Their most recent endeavours have led to a new derivative material that is just as strong and even more stable than the original graphene, but that does not conduct electricity at all: so-called fluorographene.

Graphene itself is a single atomic layer of the material graphite, commonly found in pencils. On a molecular level, it has a flat honeycomb structure of connecting hexagons with carbon atoms at the vertices. Clouds of electrons spread across the top and bottom surfaces, which is why the material conducts electricity so well.

The current achievement of the Manchester group, working closely with international collaborators, is to place a fluorine atom at every single carbon atom, thereby destroying the electron cloud and preventing electricity from flowing under normal conditions, but not impinging on the structural integrity of the carbon framework. In previous work, they had added hydrogen atoms instead of fluorine, but found the resulting material to be unstable at high temperatures.

The latest breakthrough is published this week in the journal Small. Rahul Raveendran-Nair is a postgraduate researcher at the University of Manchester and responsible for the publication. He describes fluorographene as “the thinnest possible insulator, made by attaching fluorine atoms to each of the carbon atoms in graphene. It is the first stoichiometric chemical derivative of graphene and it is a wide-gap semiconductor. Fluorographene is a mechanically strong and chemically and thermally stable compound. Properties of this new material are very similar to Teflon and we call this material 2D Teflon.”

Developing a suitable method for making this 2D Teflon was not simple. “Fluorine is a highly reactive element, and it reacts with all most everything. So the major challenge was to fully fluorinate graphene without damaging the graphene and its supporting substrates. Our fluorination of single-layer graphene membranes on chemically inert support grid and bulk paper at elevated temperature overcomes this technical problem,” explains Raveendran-Nair.

The authors envisage that fluorographene will be used in electronics, but acknowledge that “for realistic electronic applications the electronic quality has to be improved. We hope this can be achieved very soon. Some possible electronic applications of fluorographene are its use as a tunnel barrier and as a high-quality or barrier material for organic electronics.” Other fields of application are also possible. For example, as a wide-gap semiconductor that is fully transparent to visible light, fluorographene could well find use in LEDs (light-emitting diodes) and displays.

The Manchester group was not the only one involved, and collaborators from China (Shenyang National Laboratory for Materials Science), The Netherlands (Radboud University of Nijmegen), Poland (Institute of Electronic Materials Technology), and Russia (Nikolaev Institute of Inorganic Chemistry) added their expertise. According to Raveendran-Nair, having such a large team helped undertake a thorough investigation of fluorographene; “All of us worked very hard to make this project successful. We used a large variety of characterisation techniques and very detailed studies to understand the properties of this new material.”

During the course of the project the leaders were named as Nobel Laureates, but apparently life working in the group has not changed very much. “Even in their new busy life both professors still work very closely with all those in the group and are very much involved in the day-to-day research”, says Raveendran-Nair. “Working under them is a great inspiration. It is both a rewarding and enjoyable place to undertake research.”

Explore further: Toward a better understanding of bilayer graphene

More information: “Fluorographene: A Two-Dimensional Counterpart of Teflon”, Rahul R. Nair et al., Small 2010; DOI: 10.1002/smll.201001555

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3 / 5 (2) Nov 04, 2010
Wow! What a great way to make huge high capacity capacitors! A thin insulator and the best conductor around! Imagine how much charge you could pack into that!
Bye Bye batteries! Hello quick recharges!!
not rated yet Nov 04, 2010

It'll be a while though. Producing graphene (never mind fluorographene) in sufficient quantities at low price, would be the first trick. I'm sure other tricky stuff is involved, as well...
not rated yet Nov 05, 2010
Thanks for the interest in this work! If anyone’s interested in finding out more about the science behind this story, we’ve set the original research article free to access for the next four weeks; you can find it here: http://www.materi...or_.html

Adrian Miller
not rated yet Nov 07, 2010
Did someone just say nanosuits? XD
not rated yet Nov 08, 2010
Wow! What a great way to make huge high capacity capacitors!

How so?

Where are you getting the idea that fluorographene has an unusually high permitivity or electrical breakdown voltage?

A thin insulator and the best conductor around!

That just seems like a bother. How many thousands of layers of fluorographene will you have to apply between each layer of graphene just to hold a 12 V voltage without arcing?

Imagine how much charge you could pack into that!

The amount of charge stored tells you nothing without knowing the voltage.

I have no idea, and from what you've posted so far I can comfortably say that you don't either.
not rated yet Nov 11, 2010
Gotta admit, though, it (supercaps) is an intriguing possibility....

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