Graduate Thesis Or Dissertation
 

Printed Nanocomposite Devices and Flexible Electronics for Humidity Sensing

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/zc77sw26w

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  • The thesis focuses on the development of a novel printed resistive humidity sensor and integrated flexible electronics for an RFID-enabled humidity sensing platform. We explored a hybrid nanocomposite material for humidity sensing consisting of carbon nanomaterials, conductive polymer and cellulose polymer that undergoes resistance change in response to humidity change. The effects of material composition ratios, choice of material, and sensor dimension on sensing performance were investigated to achieve an optimal humidity sensitivity of about 0.02646 ΔR/R/%RH (13.23 Ω/%RH) and a linearity correlation (R²) of 0.96. We also demonstrated a wireless sensing platform by integrating the humidity sensor and an active UHF RFID on a flexible substrate all fabricated by screen printing technology. The sensing materials and printed flexible electronics integration developed in this study form the technical foundation of the future wearable sensing technology.
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