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September 2007

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douglis heung <[log in to unmask]>
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Sun, 16 Sep 2007 19:18:59 +0000
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Yet, there remains a problem with the "nano" in both nanoscience and nanotechnology. "Nanotechnology's a term with not too much new in it. It existed a long time ago," says Dai. Indeed, the characteristic length of bonds that have always been under scrutiny in the molecular sciences is on the order of a nanometer. Chidsey adds, "I worry that the term confuses people about what's important: the length scale itself is not important." Rather, it is the novel properties that structures exhibit at the nanoscale that is. As Dai puts it, "We work on carbon nanotubes not because they are small, but because they are interesting. They just happen to be nano." For all the problems with the term nanotechnology, though, it may have done some good. Chidsey remarks, "Just as nanotechnology has attracted the attention of outsiders, it also stimulates us internally: it provides a context for tackling and defining grand challenges-things so out there you wouldn't tackle them otherwise."
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.
Energy: Self-Assembling Solar Cells Dr. Michael McGehee, Materials Science and Engineering

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