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Carbon materials

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When compounds of bromine or chlorine (represented in blue) are introduced into a block of graphite (shown in green), the atoms find their way into the structure in between every third sheet, thus increasing the spacing between those sheets and making it easier to split them apart.

Layer upon layer

Method holds promise for making two- or three-tier graphene films that could be used for new electronic devices.

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This filament containing about 30 million carbon nanotubes absorbs energy from the sun as photons and then re-emits photons of lower energy, creating the fluorescence seen here. The red regions indicate highest energy intensity, and green and blue are lower intensity.

Solar funnel

New antenna made of carbon nanotubes could make photovoltaic cells more efficient by concentrating solar energy.

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