The organic-inorganic hybrid colorimetric humidity sensor which can obtain environmental humidity by electrical signals and color changes has broad application prospects in the field of humidity monitoring because of its high feature color discrimination, excellent stability, and simple preparation process. However, its long response-recovery time is generally not conducive to real-time humidity monitoring. In this paper, nanometer silica particles were doped into Polyimide(PI)-Nickel(Ⅱ) iodide(NiI2) organic-inorganic hybrid materials to fabricate PI-SiO2/NiI2 composite films and colorimetric humidity sensors. Then their surface morphologies and humidity sensing properties were studied. It is found that PI-SiO2/NiI2 film owns a honeycomb-like surface morphology, the humidity sensitivity of PI-SiO2/NiI2 colorimetric humidity sensor is better than other NiI2 based humidity sensors, its characteristic color is distinct in the range of 11%~97% RH humidity, and the humidity response time of the PI-SiO2/NiI2 colorimetric humidity sensor is less than 1.5 s, the recovery time is less than 18 s. The research indicates that the doping of nanometer silica particles can effectively improve response-recovery properties of the organic-inorganic hybrid colorimetric humidity sensor, which offers a certain reference to promote the performance of the sensor.
下载:
