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56

Microcontact printing [23].

Mask is produced by photo- or electron beam lithography techniques (a). Prepolymer is poured onto master pattern (b) and peeled away from the master (c). The stamp is inked with alkanethiol (d) and used to transfer the alkanethiol to the gold surface (e). This transfer forms a patterned self-assembled monolayer (f). After this step there are two possibilities. To obtain surface patterned with protein, self-assembly of protective monolayer 2 is first carried out (g) and then protein selectively adsorbs onto monolayer 1 (h). To obtain pattern in silicon, gold is etched through the mask produced by monolayer 1 (i) and then silicon is etched selectively through the gold mask (j). Finally the same substrate can be prepared for further treatments (k).

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