Common cellophane can be turned into a high-tech medical sensor using a simple laser and no expensive pumps.
April 24, 2026
Original Paper
Low-cost colourimetric biosensing using laser-patterned cellophane-based fluidic devices
SSRN · 6631339
The Takeaway
High-end medical diagnostics usually require expensive plastic chips and complex machinery to move fluids around. This new method patterns channels directly onto biodegradable cellophane to create paper-like tests for glucose and nitrites. The material is so cheap and abundant that it could be used for mass health screenings in developing countries. Because the sensors are made of cellophane, they can be easily disposed of without creating plastic waste. This makes advanced healthcare testing both accessible and environmentally friendly.
From the abstract
Cellophane is an attractive low-cost substrate for environmentally sustainable fluidic devices because it is biodegradable. Here, we report a laser direct-write (LDW) method, which relies on the principle of photo-polymerisation of a light-sensitive polymer for rapid fabrication of cellophane-based fluidic devices. In this method, a photo-polymer is first deposited on a cellophane substrate in a user-defined pattern and subsequently illuminated using a 405 nm laser to photo-polymerise the pre-de