Humidity-controlled terahertz pulsed spectroscopy for characterizing water uptake in thin proton-exchange membranes

Ludlam, George A.H. and Gnaniah, Samuel J.P. and Degl'innocenti, Riccardo and Gupta, Gaurav and Wain, Andrew J. and Lin, Hungyen (2024) Humidity-controlled terahertz pulsed spectroscopy for characterizing water uptake in thin proton-exchange membranes. In: 2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2024 :. International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz . IEEE Computer Society Press, AUS. ISBN 9798350370324

Abstract

Terahertz time-domain spectroscopy (THz-TDS) is commonly performed under ambient or nitrogen purged conditions. Given that proton-exchange membranes will operate under various humidities, here we propose humidity-controlled THz-TDS to extract membrane water uptake where our results are in agreement with gravimetric based dynamic vapor sorption (DVS) data in the literature.