Sustainable Printed Chitosan-Based Humidity Sensor on Flexible Biocompatible Polymer Substrate

Johanna Zikulnig*, Sabine Lengger, Lukas Rauter, Lukas Neumaier, Sandro Carrara, Jurgen Kosel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Humidity is one of the most relevant physical parameters to sense and control for a wide range of commercial and industrial applications. Consequently, there is continuing demand for the development of innovative and sustainable humidity sensor solutions. Here, the development and characterization of fully additively manufactured, highly sensitive, resistive Chitosan-based humidity sensors on flexible thermoplastic polyurethane (TPU) foil, as well as on a glass carrier substrate are presented. The sensors unite aspects of sustainability and high performance in a broad humidity range (20-90%rH). The humidity response follows an exponential curve progression with relative changes in the resistance per %rH of 6.9% and 5.7% for the glass carrier sensor and the TPU sensor, respectively. In absolute values, this means that the Chitosan-based sensors are particularly sensitive in the low humidity range with a vast dynamic range (ten times larger compared to commonly used capacitive humidity sensors). The flexible sensor on the TPU substrate shows great stability even after repeated bending. In addition, the combination of flexible and biocompatible materials (TPU and Chitosan) with additive manufacturing technologies makes the sensor particularly sustainable while having great potential for a plethora of biomedical applications.

Original languageEnglish (US)
Article number1500804
JournalIEEE Sensors Letters
Issue number12
StatePublished - Dec 1 2022

Bibliographical note

Publisher Copyright:
© 2017 IEEE.


  • additive manufacturing
  • Chitosan
  • flexible electronics
  • humidity sensor
  • Sensor phenomena
  • sensors
  • sustainable sensors

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering


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