Surface Channel Technology is widely used as the fabrication process to make free-hanging microchannels in various microfluidic devices. In this extended abstract, we report an innovative fabrication method to embed highly-doped silicon electrodes between the adjacent free-hanging microfluidic channels using the SCT process. Essentially, two parameters are used to tune the final cross-sectional geometry and size of the bulk silicon electrodes. One is the distance between two adjacent rows of slits and the other is the width of flat membrane above the microchannels. The advantageous physical features make bulk silicon electrodes suitable for many sensing and actuation applications. When the bulk silicon electrodes are used as microheaters, they allow higher power dissipation. This is because of their larger cross-sectional areas compared to the commonly used thin film metal microheaters. Moreover, as sensing electrodes, bulk silicon electrodes are located between the sidewalls of two adjacent microchannels. This makes them applicable as the sidewall resistive or capacitive readout in e.g. flow sensors.
|Number of pages||4|
|Publication status||Published - 2 Oct 2019|
|Event||4th Conference on MicroFluidic Handling Systems, MFHS 2019 - De Kleine Willem, Enschede, Netherlands|
Duration: 2 Oct 2019 → 4 Oct 2019
Conference number: 4
|Conference||4th Conference on MicroFluidic Handling Systems, MFHS 2019|
|Abbreviated title||MFHS 2019|
|Period||2/10/19 → 4/10/19|
Zhao, Y., Veltkamp, H-W., Schut, T. V. P., Groenesteijn, J., de Boer, M. J., Wiegerink, R. J., & Lötters, J. C. (2019). Highly-doped bulk silicon microheaters and electrodes embedded between free-hanging microfluidic channels by surface channel technology. 116-119. Paper presented at 4th Conference on MicroFluidic Handling Systems, MFHS 2019, Enschede, Netherlands.