School of Advanced Materials Science & Engineering , Sungkyunkwan University , Suwon 440-745 , Republic of Korea.
ACS Sens. 2019 Dec 27;4(12):3291-3297. doi: 10.1021/acssensors.9b01917. Epub 2019 Dec 13.
Water sensors are a type of level sensor that can be used in various applications requiring the sensing of water levels, such as in dams, nuclear power plants, water pipes, water tanks, and dehumidifiers. In particular, water sensors in water ingress monitoring systems (WIMS) protect lives and property from disasters caused by water leakage and flooding. Here, a resistive water sensor for WIMS that incorporates poly(3,4-ethylenedioxythinophene):poly(styrene sulfonate) (PEDOT:PSS) grafted with poly(ethylene glycol) methyl ether (PEGME) (PEDOT:PSS--PEGME copolymer) as high-conductivity electrodes and laser-treated PEDOT:PSS--PEGME copolymer as the low-conductivity resistive component is reported. The configuration of the water sensor is modeled as two parallel resistors (||) when water comes into contact with the sensor surface. The two-resistor configuration exhibits a better performance in comparison with single-resistor configurations comprising only PEDOT:PSS--PEGME copolymer or laser-treated PEDOT:PSS--PEMGE copolymer. Moreover, PEDOT:PSS--PEGME copolymer is applied to the sensor to improve the stability of PEDOT:PSS in water. We demonstrate that the sensor can detect the water level in real time with high sensitivity and accuracy, and thus has potential in applications for monitoring water-related hazards.
水传感器是一种液位传感器，可用于各种需要检测液位的应用中，例如水坝、核电站、水管、水箱和除湿器。特别是，水入侵监测系统 (WIMS) 中的水传感器可保护生命和财产免受漏水和洪水造成的灾害。在这里，我们报告了一种用于 WIMS 的电阻式水传感器，该传感器将接枝有聚乙二醇甲醚 (PEGME) 的聚(3,4-亚乙基二氧噻吩)：聚(苯乙烯磺酸盐) (PEDOT:PSS) (PEDOT:PSS-PEGME 共聚物) 用作高导电性电极，并用激光处理的 PEDOT:PSS-PEGME 共聚物作为低导电性电阻元件。当水接触到传感器表面时，水传感器的配置被建模为两个并联电阻 (||)。与仅包含 PEDOT:PSS-PEGME 共聚物或激光处理的 PEDOT:PSS-PEGME 共聚物的单电阻配置相比，这种双电阻配置表现出更好的性能。此外，将 PEDOT:PSS-PEGME 共聚物应用于传感器可提高 PEDOT:PSS 在水中的稳定性。我们证明，该传感器可以实时、高灵敏度和高精度地检测水位，因此在监测与水相关的危险的应用中具有潜力。
