Specific Process Knowledge/Characterization/Sample preparation: Difference between revisions
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=Replica Molding for Sample Inspection= | =Replica Molding for Sample Inspection= | ||
''by Frederik Stöhr | ''by Frederik Stöhr, DTU Nanolab (former DTU Danchip), May 2015'' | ||
==Introduction== | ==Introduction== | ||
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* There is a dedicated lab for work with PDMS at DTU Nanotech (not sure where it is now 2019-06-26). | * There is a dedicated lab for work with PDMS at DTU Nanotech (not sure where it is now 2019-06-26). | ||
* Please be aware that it is not allowed to work with PDMS in its uncured state inside the cleanroom. The list of approved chemicals inside the cleanroom still holds. | * Please be aware that it is not allowed to work with PDMS in its uncured state inside the cleanroom. The list of approved chemicals inside the cleanroom still holds. | ||
* Details on | * Details on our experience with PDMS as a casting material may be found in [[http://www.sciencedirect.com/science/article/pii/S0167931714005322 3]] (please cite!). A detailed description for PDMS casting can be found in [[http://www.nature.com/nprot/journal/v5/n3/full/nprot.2009.234.html 2]] and practical information is given in [[http://www.elveflow.com/microfluidic-tutorials/soft-lithography-reviews-and-tutorials/introduction-in-soft-lithography/pdms-softlithography-replication/ 4]]. | ||
* The most important steps for obtaining high quality casts are the thorough mixing of the two components of the PDMS Kit (Sylgard 184, Dow Corning) and the sufficient outgassing of the polymer prior and after pouring the polymer into the mould. The house vacuum may be too weak. For special demands, try to get hold of a separate pump like a HiCube Classic from Pfeiffer Vacuum [[http://www.sciencedirect.com/science/article/pii/S0167931708004656 5]] (there is one around at DTU Photonics or Danchip). | * The most important steps for obtaining high quality casts are the thorough mixing of the two components of the PDMS Kit (Sylgard 184, Dow Corning) and the sufficient outgassing of the polymer prior and after pouring the polymer into the mould. The house vacuum may be too weak. For special demands, try to get hold of a separate pump like a HiCube Classic from Pfeiffer Vacuum [[http://www.sciencedirect.com/science/article/pii/S0167931708004656 5]] (there is one around at DTU Photonics or DTU Nanolab (former DTU Danchip)). | ||
* The application of an anti-stiction coating, like FDTS, is necessary. It may be applied inside the cleanroom by the MVD. Contact the respective person. | * The application of an anti-stiction coating, like FDTS, is necessary. It may be applied inside the cleanroom by the MVD. Contact the respective person. | ||
* The mold may be reused upon casting without deterioration (try!) | * The mold may be reused upon casting without deterioration (try!) | ||