Here's To Biology: Nature's Own Nanomachines Dr. Steve Block, Biology and
Applied Physics
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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.
"Whether nanotechnology had ever showed up or not, electronics would have gotten
there anyway," says Professor Saraswat. For the past four decades, the number of
transistors that can be put on a chip, or equivalently, the number of information
processing events that can be done per chip, has doubled every twenty-two months;
concomitantly, the cost per processing event has dropped. Following this trend called
Moore's Law, microelectronics has steadily settled into nanoelectronics in the past
decade.
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