Energy: Self-Assembling Solar Cells Dr. Michael McGehee, Materials Science and
Engineering
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18 Stanford Scientific Review successfully demonstrated their use as highly sensitive toxic gas sensors, and
with Professor Calvin Quate (Electrical Engineering), has commercialized nanotubes as scanning probe tips to
increase probe resolution and tip durability. An area that Dai has just begun exploring is the drug delivery
potential of carbon nanotubes. "The tube has a large surface area and is empty inside. So either you can
attach the drug to the outer surface, or fill it up like a test tube," says Dai. Furthermore, multiple
functional molecules can be attached to the surface: "Say, a molecule that fluoresces to tell you where
the drug is in the cell and an antibody that specifically targets the site of drug delivery." So far,
Dai reports that his research finds nanotubes to be quite "biologically friendly."
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."
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