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Thin PDMS Films Using Long Spin Times or Tert-Butyl Alcohol as a Solvent

Thin polydimethylsiloxane (PDMS) films are frequently used in ‘‘lab on a chip’’ devices as flexible membranes. The common solvent used to dilute the PDMS for thin films is hexane, but hexane can swell the underlying PDMS substrate. A better solvent would be one that dissolves uncured PDMS but doesn’t swell the underlying substrate. Here, we present protocols and spin curves for two alternatives to hexane dilution: longer spin times and dilution in tert-butyl alcohol. The thickness of the PDMS membranes under different spin speeds, spin times, and PDMS concentrations was measured using an optical profilometer. The use of tert-butyl alcohol to spin thin PDMS films does not swell the underlying PDMS substrate, and we have used these films to construct multilayer PDMS devices.

PDF document icon Koschwanez et al 2009.pdf — PDF document, 256 kB (262539 bytes)

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