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(a) Scanning electron microscope images of a surface-acoustic wave resonator. (b) Humidity dependence of resonant frequency shift. Inset: Electrospun polyaniline and polyvinyl butyral composite nanofibers. (c) Response and recovery time of the SAW sensor between 11 and 98%RH. Courtesy: Adapted with permission from ref. [116]. Copyright 2012 Elsevier.
