Figure 6
From: Capacitive humidity sensing properties of freestanding bendable porous SiO2/Si thin films

(a) Humidity sensing properties as a function of RH at the frequencies of 100Â k, 500Â k, and 1Â MHz, (b) hysteresis characteristics for the adsorption and desorption at a frequency of 100Â kHz, (c) a single sensing curve at 100Â kHz in 71.4% RH, and (d) Nyquist plots for the RH levels of 1.8%, 53.4% and 84.5% (inset: the equivalent circuit model of the porous SiO2/Si film).