Institute of Optical Materials and Technologies "Acad. J. Malinowski", Bulgarian Academy of Sciences, Akad. G. Bonchev str., bl. 109, 1113 Sofia, Bulgaria.
Institute of Polymers, Bulgarian Academy of Sciences, Akad. G. Bonchev Str., bl. 103-A, 1113 Sofia, Bulgaria.
Sensors (Basel). 2021 May 25;21(11):3674. doi: 10.3390/s21113674.
Thin spin-coated polymer films of amphiphilic copolymer obtained by partial acetalization of poly (vinyl alcohol) are used as humidity-sensitive media. They are deposited on polymer substrate (PET) in order to obtain a flexible humidity sensor. Pre-metallization of substrate is implemented for increasing the optical contrast of the sensor, thus improving the sensitivity. The morphology of the sensors is studied by surface profiling, while the transparency of the sensor is controlled by transmittance measurements. The sensing behavior is evaluated through monitoring of transmittance values at different levels of relative humidity gradually changing in the range 5-95% and the influence of up to 1000 bending deformations is estimated by determining the hysteresis and sensitivity of the flexible sensor after each set of deformations. The successful development of a flexible sensor for optical monitoring of humidity in a wide humidity range is demonstrated and discussed.
通过部分缩醛化聚乙烯醇得到的两亲性共聚物的薄旋涂聚合物膜可用作湿度敏感介质。将其沉积在聚合物基底（PET）上，以获得柔性湿度传感器。对基底进行预金属化，以提高传感器的光学对比度，从而提高其灵敏度。通过表面轮廓测量研究传感器的形态，通过透射率测量控制传感器的透明度。通过监测在 5-95%范围内逐渐变化的不同相对湿度水平下的透射率值来评估传感行为，并通过在每组变形后确定柔性传感器的滞后和灵敏度来估计多达 1000 次弯曲变形的影响。成功开发了一种用于在较宽湿度范围内进行光学湿度监测的柔性传感器，并对其进行了讨论。
