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High humidity sensing by ‘hygromorphic’ dielectric elastomer actuator
Sensors and Actuators B: Chemical ( IF 8.0 ) Pub Date : 2020-11-29 , DOI: 10.1016/j.snb.2020.129268
Milan Shrestha , Zhenbo Lu , Gih-Keong Lau

Many capacitive or resistive humidity sensors cannot accurately measure high humidity because of surface water condensation and saturation of hygrosopic material in the sensors. Here, we propose a novel method of high humidity measurement using a ‘hydromorphic’ dielectric elastomer actuator (DEA). This novel humidity sensor consists of a ‘relatively water-inert’ acrylic dielectric elastomer layer (3M VHB 4910) sandwiched by a pair of hygroscopic polymer electrodes. The hygroscopic polymer electrodes are made of poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS); they become softer upon moisture absorption while enabling moisture permeation into the dielectric elastomer substrate during electrical activation and read-out. While the dielectric elastomeric actuation (under constant voltage) enlarged with increasing humidity, the current leaked through it rose more significantly. This suggests a strong humidity dependence of dielectric resistivity. Experimental correlation showed the dielectric resistance be a piecewise linear function of humidity. Further, this DEA-based humidity sensor remained working when both its electrodes were sprayed with a mist of water droplets.



中文翻译:

通过“变质”介电弹性体执行器实现高湿度感测

由于表面水的凝结和传感器中吸湿物质的饱和,许多电容式或电阻式湿度传感器无法准确测量高湿度。在这里,我们提出了一种使用“氢态”介电弹性体致动器(DEA)进行高湿度测量的新方法。这种新颖的湿度传感器由“相对水惰性”的丙烯酸介电弹性体层(3M VHB 4910)夹在一对吸湿聚合物电极之间。吸湿性聚合物电极由聚(3,4-乙撑二氧噻吩)聚苯乙烯磺酸盐(PEDOT:PSS)制成;它们在吸收水分后变软,同时在电激活和读出过程中使水分渗透到介电弹性体基材中。当介电弹性体驱动(在恒定电压下)随着湿度的增加而扩大时,通过它泄漏的电流上升得更大。这表明介电电阻率对湿度的依赖性强。实验相关性表明,介电电阻是湿度的分段线性函数。此外,当这两个基于DEA的湿度传感器的两个电极都喷有水滴时,它仍然可以工作。

更新日期:2020-12-08
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