I’m looking into bonding a PDMS microfluidic circuit to a PI sheet using a plasma activation method. The PDMS will be on the order of ~700 um thickness, while the PI will be 12.5-50 um. I have read a paper on nitrogen plasma bonding of the two but in their case, they spin-coated the PI onto PDMS. Does anyone know if it’s possible to use such a method on two separate solids? Or preferably even an oxygen plasma bond method?