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Enhancing Strain-Sensing Properties of the Conductive Hydrogel by Introducing PVDF-TrFE
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-09-28 , DOI: 10.1021/acsami.2c13074 Zhirui Hu 1 , Jie Li 1 , Xiaotong Wei 1 , Chen Wang 1 , Yang Cao 1 , Zhiqiang Gao 2 , Jing Han 2 , Yingchun Li 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-09-28 , DOI: 10.1021/acsami.2c13074 Zhirui Hu 1 , Jie Li 1 , Xiaotong Wei 1 , Chen Wang 1 , Yang Cao 1 , Zhiqiang Gao 2 , Jing Han 2 , Yingchun Li 1
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Conductive hydrogels have attracted attention because of their wide application in wearable devices. However, it is still a challenge to achieve conductive hydrogels with high sensitivity and wide frequency band response for smart wearable strain sensors. Here, we report a composite hydrogel with piezoresistive and piezoelectric sensing for flexible strain sensors. The composite hydrogel consists of cross-linked chitosan quaternary ammonium salt (CHACC) as the hydrogel matrix, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT: PSS) as the conductive filler, and poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE) as the piezoelectric filler. A one-pot thermoforming and solution exchange method was used to synthesize the CHACC/PEDOT: PSS/PVDF-TrFE hydrogel. The hydrogel-based strain sensor exhibits very high sensitivity (GF: 19.3), fast response (response time: 63.2 ms), and wide frequency range (response frequency: 5–25 Hz), while maintaining excellent mechanical properties (elongation at break up to 293%). It can be concluded that enhanced strain-sensing properties of the hydrogel are contributed to both greater change in the relative resistance under stress and wider response to dynamic and static stimulus by adding PVDF-TrFE. This has a broad application in monitoring human motion, detecting subtle movements, and identifying object contours and a hydrogel-based array sensor. This work provides an insight into the design of composite hydrogels based on piezoelectric and piezoresistive sensing with applications for wearable sensors.
中文翻译：
通过引入 PVDF-TrFE 增强导电水凝胶的应变传感性能
导电水凝胶因其在可穿戴设备中的广泛应用而备受关注。然而，为智能可穿戴应变传感器实现具有高灵敏度和宽频带响应的导电水凝胶仍然是一个挑战。在这里，我们报告了一种用于柔性应变传感器的具有压阻和压电传感的复合水凝胶。复合水凝胶由交联壳聚糖季铵盐（CHACC）作为水凝胶基质，聚（3,4-乙烯二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）作为导电填料，聚（偏二氟乙烯）-三氟乙烯）（PVDF-TrFE）作为压电填料。采用一锅热成型和溶液交换法合成 CHACC/PEDOT: PSS/PVDF-TrFE 水凝胶。基于水凝胶的应变传感器具有非常高的灵敏度（GF：19.3）、快速响应（响应时间：63.2 ms）和宽频率范围（响应频率：5-25 Hz），同时保持出色的机械性能（断裂伸长率） 293%）。可以得出结论，通过添加 PVDF-TrFE，水凝胶增强的应变传感特性有助于在应力下的相对电阻发生更大的变化，以及对动态和静态刺激的更广泛响应。这在监测人体运动、检测细微运动、识别物体轮廓和基于水凝胶的阵列传感器方面具有广泛的应用。
更新日期：2022-09-28
中文翻译：
通过引入 PVDF-TrFE 增强导电水凝胶的应变传感性能
导电水凝胶因其在可穿戴设备中的广泛应用而备受关注。然而，为智能可穿戴应变传感器实现具有高灵敏度和宽频带响应的导电水凝胶仍然是一个挑战。在这里，我们报告了一种用于柔性应变传感器的具有压阻和压电传感的复合水凝胶。复合水凝胶由交联壳聚糖季铵盐（CHACC）作为水凝胶基质，聚（3,4-乙烯二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）作为导电填料，聚（偏二氟乙烯）-三氟乙烯）（PVDF-TrFE）作为压电填料。采用一锅热成型和溶液交换法合成 CHACC/PEDOT: PSS/PVDF-TrFE 水凝胶。基于水凝胶的应变传感器具有非常高的灵敏度（GF：19.3）、快速响应（响应时间：63.2 ms）和宽频率范围（响应频率：5-25 Hz），同时保持出色的机械性能（断裂伸长率） 293%）。可以得出结论，通过添加 PVDF-TrFE，水凝胶增强的应变传感特性有助于在应力下的相对电阻发生更大的变化，以及对动态和静态刺激的更广泛响应。这在监测人体运动、检测细微运动、识别物体轮廓和基于水凝胶的阵列传感器方面具有广泛的应用。
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