UmmulBanin Hasani
Research Mentor: Kenn Oldham
Mentor Department: Mechanical Engineering, Engineering
Author(s): Not Available
Session: Session 3 (11:00 AM – 11:50 AM)
Presentation Type: Poster 10
Abstract
Many wearable sensors today give unclear data when the body moves, making it hard to track important signals. This project explores PDMS-CNT as a material that can still measure heart rate, blood pressure, and vascular resistance during movement. The device is made by coating PDMS-CNT with a thin copper layer. We will be adding a dry-film photoresist, and shining light through a stencil or mask to form either a positive (washed-away) or negative (hardened) pattern. After this, we will be using an etchant to remove the unwanted copper, with the final step being the removal of the photoresist to reveal the final pattern. Our current work focuses on selecting lithography materials that can produce clear, stable sensor patterns. From our evaluation, the best candidate photoresist is the DuPont Riston FX900, a negative dry film with a recommended UV exposure of 100–200 mJ/cm². It hardens strongly in exposed regions and protects the copper well, though it requires high lamination temperatures and may release vapors that can irritate skin and eyes. This film develops in a 1% Na2CO3 solution, which removes the unexposed areas. We are now researching etchants with low etch rates to allow better pattern control. These findings will help improve sensor accuracy during movement, supporting future development of wearable medical devices.
