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. 2018 Jan 11;8:439. doi: 10.1038/s41598-017-18979-3

Figure 2.

Figure 2

Characterization of the sensor. (a) Fabricated humidity sensor compared with a 5 cent US coin. (b) Optical microscope image of the sensor at the sensing region. (c) 2D AFM images of the surface of PEDOT:PSS deposited on the substrate. (d) S 21 frequency response of DSRR. (e) Isotherm characteristics of the sensor versus RH adsorption and desorption.