Journal
SENSORS
Volume 21, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/s21113674
Keywords
flexible substrates; humidity; sensor; optical sensor; polymers
Funding
- Bulgarian Ministry of Education and Science (MES) [DCM 577/2018]
- Bulgarian Ministry of Education and Science
- European Regional Development Fund within the Operational Programme Science and Education for Smart Growth 2014-2020 under the Project CoE National center of mechatronics and clean technologies [BG05M2OP001-1.001-0008-C01]
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Thin spin-coated polymer films of amphiphilic copolymer obtained by partial acetalization of poly(vinyl alcohol) are used as humidity-sensitive media for flexible humidity sensor applications. Pre-metallization of the substrate is implemented to increase the optical contrast and sensitivity of the sensor. The sensing behavior is evaluated by monitoring transmittance values at different humidity levels, and the sensor's hysteresis and sensitivity are determined after bending deformations. The successful development of a flexible sensor for optical monitoring of humidity in a wide range is demonstrated and discussed.
Thin spin-coated polymer films of amphiphilic copolymer obtained by partial acetalization of poly (vinyl alcohol) are used as humidity-sensitive media. They are deposited on polymer substrate (PET) in order to obtain a flexible humidity sensor. Pre-metallization of substrate is implemented for increasing the optical contrast of the sensor, thus improving the sensitivity. The morphology of the sensors is studied by surface profiling, while the transparency of the sensor is controlled by transmittance measurements. The sensing behavior is evaluated through monitoring of transmittance values at different levels of relative humidity gradually changing in the range 5-95% and the influence of up to 1000 bending deformations is estimated by determining the hysteresis and sensitivity of the flexible sensor after each set of deformations. The successful development of a flexible sensor for optical monitoring of humidity in a wide humidity range is demonstrated and discussed.
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