Research Progress on Humidity-Sensing Properties of Cu-Based Humidity Sensors: A Review

Figure 6

(a) Graph of resistance-humidity function (CuO NPs). (b) The timing behavior of the CuO NPs. (c) The humidity hysteresis of CuO NPs. (d) The humidity stability of the CuO NPs [65].

(a)

(b)

(c)

(d)