文档介绍：anic Nanotubes: Structure, Synthesis, and Properties
I
Reshef Tenne
Weizmann Institute, Rehovot, Israel
INTRODUCTION diameter at each of the two ends. Therefore, these
structures can be viewed as an elongated form of a
Nanoparticles of anic pounds, such as fullerene. Both fullerenes and nanotubes are seamless
WS2, were shown to be unstable in the planar form and, in structures having threefold bonded carbon atoms only.
analogy to carbon nanoparticles, they form closed-cage The absence of dangling bonds renders these structures
structures with polyhedral or nanotubular shapes. These energetically very stable. heless, the deviation from
findings extend the paradigm of carbon fullerenes and planarity induces a nonnegligible amount of stress into the
nanotubes to the field of anic chemistry, where fullerenes, which explains many of their chemical and
numerous examples for its validity have been documented physical properties.
in recent years. Templated growth of nanotubes from
isotropic (3-D) compounds such as metal oxides and
chalcogenides was reported as well, but these nanotubes
are generally not perfectly crystalline. Various issues in CAN THE PARADIGM OF FULLERENES
the structure, synthesis, and properties of such anic AND NANOTUBES BE EXTENDED
nanotubular and fullerene-like structures are reviewed, BEYOND CARBON?
together with some possible applications.