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  • Users: sandip179
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  1. sandip179

    Streaking during spin coating

    I am spin coating a polymer solution in toluene (bp=110C). However, after spin coating, I see streaks of the polymer on the substrate. Any idea as to how to solve the issue? I have played with polymer concentration and speed without any effect.
  2. sandip179

    Different ways of Coating

    I am a recent college grad, and in my present job I am supposed to find out the best way to coat a 15" x 15" substrate with styrene butadiene rubber (SBR). Right now, we are spin-coating a solution of SBR in toluene, but in far smaller areas. Can spin coat work for larger areas like 12"x12" or...
  3. sandip179

    Master fabrication

    I am new to the microfabrication business. I have a chrome mask which has features 1 to 10 microns wide and 10 microns high. Is there any place which would make a silicon master (3" dia) out of it?
  4. sandip179

    Polymer Cracking

    I am trying to spin-coat a solution of PMMA (MW=15k) on a elastomeric material, but I find that the polymer cracks. Is there any polymer that wont crack? Or can I add any additive to my polymer to prevent cracking?

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