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Large batches of fluorescent nanotubes have been produced which shine brightly enough for nanoscale medical applications.

After using the ultracentrifugation technique, the solution separates into different layers. The purple layer at the top consists of a highly uniform population of the single-walled semiconductor nanotubes that are the most strongly luminescent.

The illustrations on the right show the typical constituents of each layer.

Image Credit: Tobias Hertel.

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