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Development and characterization of a novel low-cost water-level and water quality monitoring sensor by using enhanced screen printing technology with PEDOT:PSS

: Wang, B.; Baeuscher, M.; Hu, X.; Woehrmann, M.; Becker, K.; Juergensen, N.; Hubl, M.; Mackowiak, P.; Schneider-Ramelow, M.; Lang, K.-D.; Ngo, H.-D.

Fulltext ()

Micromachines 11 (2020), No.5, Art. 474, 15 pp.
ISSN: 2072-666X
Journal Article, Electronic Publication
Fraunhofer IZM ()

A novel capacitive sensor for measuring the water-level and monitoring the water quality has been developed in this work by using an enhanced screen printing technology. A commonly used environment-friendly conductive polymer poly(3,4-ethylenedioxythiophene):poly (styrenesulfonate) (PEDOT:PSS) for conductive sensors has a limited conductivity due to its high sheet resistance. A physical treatment performed during the printing process has reduced the sheet resistance of printed PEDOT:PSS on polyethylenterephthalat (PET) substrate from 264.39 W/sq to 23.44 W/sq. The adhesion bonding force between printed PEDOT:PSS and the substrate PET is increased by using chemical treatment and tested using a newly designed adhesive peeling force test. Using the economical conductive ink PEDOT:PSS with this new physical treatment, our capacitive sensors are cost-efficient and have a sensitivity of up to 1.25 pF/mm.