Two important types of nanostructure are nanocrystals (tiny crystals, often of semiconducting material) and nanotubes (tiny tubes, usually of pure carbon). Nanocrystals made from semiconductors change color depending on their size, and are being used for such tasks as detecting viruses in living cells. Nanotubes can conduct enormous amounts of electrical current, far more than metal wires. They are the basic material of tiny "paper" batteries, which can be rolled, folded, or cut while still producing power. Nanotubes are also now being used in materials for lightweight tennis rackets and golf clubs, and may soon enable the manufacture of TV screens no thicker than a film.
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