Patterning by Etching at the nanoscale (PENs) is a soft lithographic technique in which the bonds in the polydimethylsiloxane (PDMS) matrix are broken to controlably etch PDMS (i.e. dissolve) at a slow rate along the outside of a PDMS channel formed with a patterned PDMS stamp applied to a surface. The channel in the stamp can be enlarged in the order of tens of nanometers to several micrometres. Exposing a fresh area of a surface that can be reacted with.
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