Figure 7.

Collapse and restretching of the tethered mPEG–SH-layer observed when switching from good (PBS) to poor solvent conditions, particularly in 20% (A) and 10% (B) 2-propanol in PBS. The duration of each poor solvent injection is shaded in gray. (A) As an in situ reference two microcantilevers in the array were blocked with EG₄–C₁₁–SH. (B) As an external reference, a non-functionalized Au-coated microcantilever array was used. The averaged deflection of eight reference cantilevers was subsequently subtracted from the average deflection of eight sensing cantilevers to obtain the differential response.