Graphene layers than can absorb 90 per cent of the light spectrum could be used to power ‘smart wallpaper’ and the Internet-of-Things (IoT).
Graphene, which is an atom thick layer of carbon, has been lauded for its electrical conductivity properties but can traditionally only absorb 2.3 per cent of the light spectrum.
A team from the University of Surrey have manipulated the material so that it can instead absorb 90 per cent of the spectrum, making it the most light-absorbent material for its weight to date.
Using a technique known as nanotexturing, which involves growing graphene around a textured metallic surface, the researchers were able to form the material into a pattern which localised light into the narrow spaces between the textured surface, drastically enhancing the amount of light it is capable of absorbing.
The team drew inspiration from the eyes of moths that have microscopic patterning that allows them to see in the dimmest conditions.
These work by channelling light towards the middle of the eye while simultaneously eliminating reflections, which would otherwise alert predators of their location.
The same technique was used to fashion graphene into a pattern that would increase its light-absorbance.
The nanometre-thin material will enable future applications such as 'smart wallpaper' that could generate electricity from waste light or heat, and power a host of IoT applications.
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