Abstract
THE PRACTICAL CONSEQUENces of covalent chemistry on the electronic properties of single-walled carbon nanotubes are highlighted in two newly published papers. Robert C. Haddon and coworkers at the University of California, Riverside, have shown that metallic nanotubes functionalized with dichlorocarbene take on semiconducting properties { Science , 301 , 1501 (2003)}. The effect is due to a change in the hybridization of carbon atoms in the nanotube wall from sp2 to sp3. The change causes the electronic band gap to widen to that of a semiconductor. Any control of nanotube property is useful because nanotubes are being explored for various applications based on their electrical conductivity, notes Michael S. Strano, assistant professor of chemical and biomolecular engineering at the University of Illinois, Urbana-Champaign. Indeed, Strano, chemistry professors James M. Tour and Richard E. Smalley at Rice University, and coworkers have developed selective covalent chemistry that differentiates between met...
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