Nicolas R. Tanguy, M. Moradpour, M. C. Jain, N. Yan, M. Zarifi
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Exploring the Potential of Cellulose Nanofibrils for Humidity Sensing Using an Organic Microwave Resonator
This work presents a novel organic microwave resonator (OMR) humidity sensor fabricated by casting the electrically conducting polymer PEDOT:PSS on a flexible cellulose nanofibrils (CNF) film. The CNF substrate functioned as a functional sensing component to impart the microwave resonator superior sensing performance to humidity. The measured transmission coefficient (S21) of the OMR showed a resonant frequency at 2.78 GHz and a resonant amplitude of 14.95 dB. Higher relative humidity levels (from 0 to 90%) downshifted the S21 amplitude and increased the quality factor of the device. The sensor operated based on simultaneous adsorption of moisture in the CNF film and interactions between water molecules and PEDOT:PSS. The devised sensor further demonstrates the promise of organic microwave devices for next-generation flexible chemical sensors.
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