Nanotechnology May Lead to More Energy-Efficient Electronics

Feb. 14, 2012 — Carbon nanotubes and graphene consist of just a couple of layers of carbon atoms, but they are lighter than aluminium, stronger than steel and can bend like spring-coils. Physicist Niklas Lindahl at the University of Gothenburg, Sweden, has been studying the unique properties of the materials, which in future may result in improved electronics and light, strong material.

Nanotechnology could revolutionise the manufacture of new types of materials. Niklas Lindahl has studied carbon nanotubes and graphene, which are tubes and flat sheets consisting of a thin layer of carbon atoms. Their unique properties make them interesting to use in everything from composite materials in bicycles, to electronic computer components.
In his thesis, Niklas Lindahl demonstrates how carbon nanotubes can be made, and their mechanical properties. Under the right conditions, he used a carbonaceous gas to get carbon nanotubes to grow like forests, atom by atom. The “forests” consist of millions of carbon nanotubes that, despite being just a few nanometres in diameter, hold each other upright like stalks in a field of corn. The tubes, which are lighter than aluminium and stronger than steel when stretched, could be bent like spring-coils.
Niklas Lindahl also demonstrates how membranes of graphene can be bent. Despite the fact that the membranes were made up of just a couple of layers of atoms, their bending rigidity could be determined using the same equations as those used to calculate deformations in large steel spheres. Graphene membranes have many uses, including variable frequency generators in mobile phones, and mass sensors with the ability to measure individual atoms.
The thesis also demonstrates how similar graphene membranes can provide more energy-efficient electronics in the future. For example, suspended graphene electrodes can change the current more effectively through carbon nanotube transistors by combining both mechanical and electrical control of the current


Scientists Untangle Nanotubes to Release Their Potential in the Electronics Industry

Oct. 21, 2013 — Researchers have demonstrated how to produce electronic inks for the development of new applications using the 'wonder material', carbon nanotubes.


Researchers have demonstrated how to produce electronic inks for the development of new applications using the 'wonder material', carbon nanotubes. (Credit: Image courtesy of Imperial College London)


Carbon nanotubes are lightweight, strong and conduct electricity, which make them ideal components in new electronics devices, such as tablet computers and touchscreen phones, but cannot be used without being separated out from their natural tangled state.
Carbon nanotubes are hollow, spaghetti-like strands made from the same material as graphene; only one nanometre thick but with theoretically unlimited length. This 'wonder material' shares many of graphene's properties, and has attracted much public and private investment into making it into useful technology.
By giving the nanotubes an electrical charge, they were able to pull apart individual strands. Using this method, nanotubes can be sorted or refined, then deposited in a uniform layer onto the surface of any object.
Working with an industrial partner, Linde Electronics, they have produced an electrically-conductive carbon nanotube ink, which coats carbon nanotubes onto ultra-thin sheets of transparent film that are used to manufacture flat-screen televisions and computer screens.
This was developed by Dr Stephen Hodge and Professor Milo Shaffer, both from Imperial's Department of Chemistry and colleagues from the London Centre for Nanotechnology, which includes fellow Imperial scientist Dr Siân Fogden, as well as Dr Chris Howard and Professor Neal Skipper from UCL.
The research is written up in the journals Nature Communications and ACS Nano.


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