Foldable, Eco-Friendly and Low-Cost Microfluidic Paper-Based Capacitive Droplet Sensor

Muhammad Hamza Zulfiqar, M. Mubasher Saleem, Muhammad Zubair, M. Qasim Mehmood, Kashif Riaz

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations


Conventional electronic components are non-foldable and non-flexible with complex and expensive fabrication processes. Considering the recent interest in foldable electronics, we report a foldable, eco-friendly, low-cost, highly sensitive, and stable microfluidic paper-based capacitive droplet (\mu PCD) sensor. The sensor is fabricated using readily available materials (filter paper and copper tape) through a simplistic, easy-go-designed, and low-cost bench-Top fabrication process. The design of the capacitive sensor is based on a parallel plate capacitor attained by direct deposition of copper tape on filter paper. The filter paper serves as a dielectric. Very small quantities (\mu Ls) of liquid can easily flow through filter paper due to micro-pores in it. The 10 \times 10 mm sensor can detect water droplets as small as 10 \mu \mathrm{L} with sensitivity 3 \pm 0.5 pF/ 1 \mu \mathrm{L}. The sensor response is insensitive to bending as tested by measuring the capacitance response at different bending radius from 0 to 7mm. The sensor responds accurately and repeatedly for different volumes of water droplets at different bending radius. Foldability of the sensor makes it suitable for the environment with different geometries, shapes, and dimensions like industry, body parts, and objects for liquid detection.
Original languageEnglish (US)
Title of host publication2020 International Conference on UK-China Emerging Technologies, UCET 2020
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9781728194882
StatePublished - Aug 1 2020
Externally publishedYes


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