CHEM 694 HW7 Key SP05

CHEM 694 HW7 Key SP05 - HW 7 KEY 1. Give the two primary...

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HW 7 KEY 1. Give the two primary reasons (from the Whitesides and Love article) why photolithography is limited for nanotechnology. There are two major limitations associated with the tailoring of nanostructures using photolithography. The first limitation is due to the fact that the smallest wavelength of UV light in use is 250nm. This becomes a problem in the production of nanostructures of spacing much smaller than 125nm in that diffraction effectively blurs the structural features often leaving boundaries between ideally distinct features hazy and not well defined. The second limitation is due to the huge expenses associated with this technique of producing nanostructures. 2. What is "soft lithography" and why is it called "soft"? A) Soft lithography is a process involving the “stamping” of PDMS (polydimethylsiloxane) to transfer tiny features to various surfaces. In soft lithography, a mold is produced using either photolithography or electron-beam lithography.
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CHEM 694 HW7 Key SP05 - HW 7 KEY 1. Give the two primary...

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