Photo Lithography

Students use photolithography – the process of using light to transfer a pattern onto a surface – to create their own printed circuit boards. A circuit pattern with tiny lines is placed on a copper film of an insulating surface, and subsequently covered by a polymer. It is then exposed to UV black light ('invisible' light that is just beyond the blue end of the colour spectrum), which creates a metal pattern that corresponds to the lines in the original pattern. This top-down approach to nanotechnology is routinely used in manufacturing computer chips. Basic photolithographic techniques used include exposing and developing a pattern in the photoresist layer, etching the unprotected copper, and finishing by stripping away the remaining photoresist. [via]

http://rsc.org/images/RSCphoto_tcm18-87772.pd...

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