基于PEDOT：PSS改性聚氨酯泡沫的全聚合物压力传感器,ACS Applied Polymer Materials

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基于PEDOT：PSS改性聚氨酯泡沫的全聚合物压力传感器
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2021-02-04 , DOI: 10.1021/acsapm.0c01389
Matteo Beccatelli ₁ , Marco Villani ₁ , Francesco Gentile ₂ , Luigi Bruno ₃ , Davide Seletti ₁ , Domna Maria Nikolaidou ₁ , Maurizio Culiolo ₁ , Andrea Zappettini ₁ , Nicola Coppedè ₁

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通过定制市场上可用的材料来生产分布式传感器的能力已成为物联网应用的新兴策略。将传感器嵌入功能性基板可以降低成本并改善集成度，并提供硅或微电子中使用的其他常规材料无法获得的独特功能。在本文中，我们演示了导电性聚合物PEDOT：PSS对商用聚氨酯（PU）泡沫的功能化：所得材料为改性的全聚合物泡沫，其中孔的内部网络均匀地覆盖有PEDOT的连续层： PSS充当机械换能器。当外力引起泡沫微结构的改变时，器件的电导率会相应地变化，能够将机械压力转换为电信号。当受到0.1至20 kPa范围内的外部压力刺激时，该传感器可提供近乎线性的响应。随频率变化的测量结果显示有用的频率范围高达20 Hz。已经提出了一种简单的微机械模型来预测系统性能，该模型基于系统的特征，包括几何约束，聚合物泡沫的微结构及其弹性模量。通过利用模拟输出，已通过将八个压力传感器嵌入到商用PU泡沫中来开发出鞋底原型中的柔性鞋。所提出的设备可以向医疗团队提供关键信息，例如实时体重分布和步行动态的详细表示。

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All-Polymeric Pressure Sensors Based on PEDOT:PSS-Modified Polyurethane Foam

The ability to produce distributed sensors by tailoring materials readily available on the market is becoming an emerging strategy for Internet of Things applications. Embedding sensors into functional substrates allows one to reduce costs and improve integration and gives unique functionalities inaccessible to silicon or other conventional materials used in microelectronics. In this paper, we demonstrate the functionalization of a commercial polyurethane (PU) foam with the conductive polymer PEDOT:PSS: the resulting material is a modified all-polymeric foam where the internal network of pores is uniformly coated with a continuous layer of PEDOT:PSS acting as a mechanical transducer. When an external force causes a modification of the foam microstructure, the conductivity of the device varies accordingly, enabling the conversion of a mechanical pressure into an electric signal. The sensor provides a nearly linear response when stimulated by an external pressure in the range between 0.1 and 20 kPa. Frequency-dependent measurements show a useful frequency range up to 20 Hz. A simple micromechanical model has been proposed to predict the device performance based on the characteristics of the system, including geometrical constrains, the microstructure of the polymeric foam, and its elastic modulus. By taking advantage of the simulation output, a flexible shoe in sole prototype has been developed by embedding eight pressure sensors into a commercial PU foam. The proposed device may provide critical information to medical teams, such as the real-time bodyweight distribution and a detailed representation of the walking dynamic.

更新日期：2021-03-12

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