快速响应恢复的PI-SiO_(2)/NiI_(2)比色湿度传感器

PI-SiO_(2)/NiI_(2) colorimetric humidity sensor with fast response and recovery

有机-无机杂化型比色湿度传感器可通过电学信号和颜色变化获取环境湿度,并因其特征颜色区分度高、稳定性好、制备工艺简单等优点,在湿度监测领域具有广阔的应用前景,但其通常响应恢复时间长,从而不利于湿度实时监测.本文在聚酰亚胺(PI)-碘化镍(NiI_(2))有机无机杂化材料中掺杂纳米SiO_(2)微球制备得到PI-SiO_(2)/NiI_(2)复合薄膜及比色湿度传感器,对其表面形貌和湿敏特性进行了研究.结果显示,PI-SiO_(2)/NiI_(2)薄膜具有蜂巢状的表面形貌,传感器的特征颜色显著,湿度响应时间小于1.5 s,恢复时间小于18 s.研究表明,纳米SiO_(2)微球掺杂能够较为显著地改善有机-无机杂化型比色湿度传感器的响应恢复特性,这对于传感器性能的提升具有一定参考意义.

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 are doped into polyimide(PI)-nickel(Ⅱ)iodide(NiI_(2))organic-inorganic hybrid materials to fabricate PI-SiO_(2)/NiI_(2)composite films and colorimetric humidity sensors.Then their surface morphologies and humidity sensing properties are studied.It is found that PI-SiO_(2)/NiI_(2)film possesses a honeycomb-like surface morphology,the humidity sensitivity of PI-SiO_(2)/NiI_(2)colorimetric humidity sensor is better than that of other NiI_(2)based humidity sensors,its characteristic color is distinct in a range of 11%–97%RH humidity,and the humidity response time of the PI-SiO_(2)/NiI_(2)colorimetric humidity sensor is less than 1.5 s,and the recovery time is less than 18 s.The research result indicates that the doping of nanometer silica particles can effectively improve response-recovery properties of the organic-inorganic hybrid colorimetric humidity sensor,which is helpful in improving the performance of the sensor.