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CHEM-ENG590E Wiki Textbook:Microcontact Printing: Difference between revisions
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CHEM-ENG590E Wiki Textbook:Microcontact Printing (view source)
Revision as of 10:44, 13 April 2016
, 13 April 2016→Cutting Edge Techniques
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'''Submerged Printing<sup>[7]</sup>''' | '''Submerged Printing<sup>[7]</sup>''' | ||
This technique attempts to address some of the stamp deformation issues by performing stamping within a non-compressible fluid. Bessueille et al. have shown that by stamping in a liquid, a much greater pressure can be applied to the stamp without deforming the pattern. additionally, higher aspect ratio features can be stamped. While conventional microcontact printing shows serious deformation over a ratio of 10:1, when submerged, a 46:1 ratio transfers perfectly, and ratios as high as 83:1 are still highly functional. | This technique attempts to address some of the stamp deformation issues by performing stamping within a non-compressible fluid. Bessueille et al. have shown that by stamping in a liquid, a much greater pressure can be applied to the stamp without deforming the pattern. additionally, higher aspect ratio features can be stamped. While conventional microcontact printing shows serious deformation over a ratio of 10:1, when submerged, a 46:1 ratio transfers perfectly, and ratios as high as 83:1 are still highly functional. | ||
'''Liftoff Printing<sup>[8]</sup>''' | '''Liftoff Printing<sup>[8]</sup>''' | ||
[[Image:Liftoff Printing Procedure.png|right|thumbnail|'''Figure X''' Liftoff printing procedure <sup>[8]</sup>]] | [[Image:Liftoff Printing Procedure.png|right|thumbnail|'''Figure X''' Liftoff printing procedure <sup>[8]</sup>]] | ||
Liftoff printing is a technique that is intended to compensate for printing flaws caused by overly large aspect ratios. The technique was first used by Ricoult et al. to create an array of microdots which could not have been printed using conventional means. Instead of creating a stamp with an array of posts to print the dots, the team created a negative stamp, coated a flat piece of PDMS with their substrate, and then lifted off the unwanted substrate using the negative stamp. This left substrate on the PDMS only in the micro dot array. This technique can be applied in similar situations where conventional stamping methods would fail. | |||
'''Macro-Stamping<sup>[10]</sup>''' | '''Macro-Stamping<sup>[10]</sup>''' | ||
