Could you please elaborate further on your setup for this application
- how did you place the polymer (i.e. is it sitting on a glass plate,
etc) and how is the UV light source positioned with respect to the
Ok, the styrenic block polymer was spin coated onto APTES coated glass
or silicon wafer substrates. It is an extremely thin layer (about
20-30 nm). The UV light source has an intensity of approximately 5 mW/
cm2 at the distance from the substrates (about 1.5-2 cm) and moves
back and forth on an automated moving arm that we connected to the
lamp. We are doing the automation to dissipate any heat that may take
the polymer above the glass transition temperature, as we considered
that to be a problem due to the close proximity of the lamp to the
samples. I'm mostly concerned with the surface morphology of the
block copolymer, so I dip the samples in a good solvent for both
blocks in order to see if it is crosslinked. On silicon, the
structures remain unchanged, however, on glass this is not always the
Should I try to place a coating on the glass that is UV reflective
(maybe sputter gold, that would bond to the APTES) or another metal
maybe? Or maybe try using a UV transmissive polymer with a reflector
under the substrate?
Thanks in advance for your help.
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