Materials: Carbon Nanotubes Dr. Hongjie Dai, Chemistry Slice a layer of pencil lead, roll it up, and you have
a carbon nanotube: a graphene sheet (a layer of graphite) rolled up into a cylinder. "A carbon nanotube
is a clever way of making a fully saturated nanowire structure-a 1-D structure with all its atoms fully
bonded," explains Professor Dai, who has developed catalysts that control where carbon nanotubes grow.
"The big challenge is controlling the synthesis. More control leads to definite physical
properties," says Dai. In contrast to conventional semi-conductors, where "the surface atoms are
not happily bonded," as Dai puts it, the high degree of structural perfection in nanotubes leads to
ballistic transport of electrons, which translates into high speed electronics. Dai predicts that while it is
doubtful that carbon nanotubes will overtake the electronics industry, it is quite possible that they will
replace some electronics components.
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Here's To Biology: Nature's Own Nanomachines Dr. Steve Block, Biology and
Applied Physics
Currently, the gate length, the characteristic length parameter in transistors,
has hit about 90 nm. The shorter the gate length, the faster transistors can
switch on and off. In fact, the transistors have gotten so fast, that the delay
as electrons flow through the skinnier and longer wires needed to cross larger,
complex chips is on track to become the limiting factora in speed. This delay
is just one of the fundamental problems that threatens to make the nanoscale
regime of electronics unfaithful to Moore's Law and demands the design of new
materials and structures or a complete shift in chip architecture.
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