Strengthening nanotube fluorescence

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The vial holds a nanotube solution after ultracentriuging has separated it 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 vial holds a nanotube solution after ultracentriuging has separated it 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 at the right show the typical constitutents of each layer. Credit: Tobias Hertel

In a way, nanotubes are nature's smallest candles. These tiny tubes are constructed from carbon atoms and they are so small that it takes about 100,000 laid side-by-side to span the width of a single human hair. In the last five years, scientists have discovered that some individual nanotubes are fluorescent.


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