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Science 12 September 2003:
Vol. 301. no. 5639, p. 1439
DOI: 10.1126/science.301.5639.1439a
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This Week in Science

Single-walled carbon nanotubes can form as either metallic or semiconducting entities. Ionic doping can create new metallic bands in semiconducting tubes. Two groups now show how covalent chemistry can convert the metallic tubes to semiconductors and may lead to efficient separation processes. Kamaras et al. (p. 1501) show that reactions with dichlorocarbene rapidly opens a gap near the Fermi level of the metallic nanotubes. Strano et al. (p. 1519) show that diazonium reagents are particularly selective for reactivity with metallic tubes and display an autocatalytic effect that functionalizes the entire tube. The derivatization reaction can be reversed thermally.

Figure 1

CREDIT: KAMARAS ET AL.




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