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(a) Frequency shifts of PEI/CS NFN membranes-based QCM sensors as a function of the RH with different PEI coating loads 0 (black), 1200 (red), and (blue) 6000 Hz. (Coating load of CS: 4000 Hz). Inset shows the FE-SEM images of CS NFN membranes. (b) Response curves of PEI/CS membranes coated QCM humidity sensors with the RH changing from 8% to 95%. (Coating load of CS: 5000 Hz; Coating load of PEI: 3600 Hz.) Reprinted with permission from [198]. © 2010 Walter de Gruyter GmbH & Co. KG.
