Sealing SU-8 microfluidic channels using PDMS |
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| Authors: | Zhang Zhiyi Zhao Ping Xiao Gaozhi Watts Benjamin R Xu Changqing |
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| Institution: | 1Institute for Microstructural Science, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada;2Department of Engineering Physics, McMaster University, Hamilton, Ontario L8S 4L7, Canada |
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| Abstract: | A simple method of irreversibly sealing SU-8 microfluidic channels using PDMS is reported in this paper. The method is based on inducing a chemical reaction between PDMS and SU-8 by first generating amino groups on PDMS surface using N2 plasma treatment, then allowing the amino groups to react with the residual epoxy groups on SU-8 surface at an elevated temperature. The N2 plasma treatment of PDMS can be conducted using an ordinary plasma chamber and high purity N2, while the residual epoxy groups on SU-8 surface can be preserved by post-exposure baking SU-8 at a temperature no higher than 95?°C. The resultant chemical bonding between PDMS and SU-8 using the method create an interface that can withstand a stress that is greater than the bulk strength of PDMS. The bond is permanent and is long-term resistant to water. The method was applied in fabricating SU-8 microfluidi-photonic integrated devices, and the obtained devices were tested to show desirable performance. |
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