Conductive polymer composites (CPCs), characterized by adjustable material parameters and specific responsiveness to external stimuli, exhibit potential utility as waveguide layers on surface acoustic wave (SAW) devices for monitoring applications. In this study, we examine the effect of swelling on the propagation of Love-type waves by subjecting a layered structure composed of a 36° Y-X lithium tantalate (LT) substrate and CPC waveguide layer. Love-type waves are first identified, and the propagation characteristics are analyzed by simulation and experimental comparison on polydimethylsiloxane (PDMS)-based CPC waveguide layers, which are filled with different acetylene carbon black (ACB) mass fractions. The influence of Love-type wave propagation after being subjected to a chemical medium is further explored. The results show that the characteristic frequency shifts of the SAW device are related to the observed swelling response of the ACB/PDMS CPCs. The experimental results are in agreement with simulations, and the frequency shifts with waveguide layer thickness variation are theoretically verified. This study illustrates the use of CPCs as a waveguide layer to modulate the propagation of Love-type waves and explores their application prospects for swelling monitoring.

中文翻译：

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以导电聚合物复合材料作为波导层的压电层状结构：基于拉夫型波传播的膨胀监测

导电聚合物复合材料 (CPC) 的特点是可调节的材料参数和对外部刺激的特定响应能力，在监测应用的表面声波 (SAW) 设备上作为波导层具有潜在的实用性。在这项研究中，我们通过研究由 36° YX 钽酸锂 (LT) 基板和 CPC 波导层组成的层状结构来研究膨胀对拉夫型波传播的影响。首先识别了爱型波，并通过模拟和实验比较分析了填充不同乙炔炭黑（ACB）质量分数的聚二甲基硅氧烷（PDMS）基CPC波导层的传播特性。进一步探讨了拉夫型波在受到化学介质影响后传播的影响。结果表明，SAW 装置的特征频移与观察到的 ACB/PDMS CPC 的膨胀响应有关。实验结果与仿真结果一致，从理论上验证了频移随波导层厚度变化的规律。本研究阐述了使用CPC作为波导层来调制Love型波的传播，并探讨了其在膨胀监测中的应用前景。