Carbon nanotubes: a future material of life.

The synthesis and applications of carbon nanotubes, a new form of crystalline carbon, are reviewed. In particular, the results obtained in the authors' laboratory are summarized, including the preparation of highly crystalline multi-walled carbon nanotubes; also discussed are the valence band and core level structures, the nonlinear optical limiting behavior, the band gap measurement, and the hydrogen uptake by carbon nanotubes, which has been greatly enhanced by alkali-doping.