Hello,
Following many procedures, I am spin coating a 1mg/ml GO in water suspension onto a nylon membrane, repeated 5 times (3000rpm, 30sec). However, there still seems to be defects, as the gas permeance of the membrane is much higher than previously reported. Any idea what the issue might be? Should I do some heat treatment to ensure proper adhesion? Dry the membrane in vac. oven between spin coating additional layers? Visually, the GO layer seems to be well stuck to the support ( no peeling).
Making a remote diagnosis is a bit hard with the existing information. In order to get better help from here, maybe post the reference that contains the procedure and the lower permeance claim.
By the way, have you tried contacting one of the authors of that study? Maybe they didn't report a detail that didn't seem important then but turns out is essential.
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