AI 中文总结
本研究开发了采用PEDOT涂层的新型磁弹性湿度传感器，其灵敏度达155 Hz/% RH、分辨率优于0.1% RH，性能优于同类传感器，可用于密封或难达环境的无线湿度监测。
AI 中文摘要
磁弹性（ME）谐振器为无源无线传感提供了极具吸引力的平台，尤其适用于密封或难以进入环境中的相对湿度（RH）监测。本研究中，我们介绍了采用聚3,4-乙撑二氧噻吩磺酸盐（PEDOT）功能化的ME湿度传感器，这是该导电聚合物首次应用于基于ME的湿度传感。通过简单的滴铸工艺将PEDOT薄膜沉积到Metglas谐振器上，得到均匀且机械稳定的涂层。通过扫描电子显微镜（SEM）、能量色散X射线光谱（EDX）、拉曼光谱、原子力显微镜/开尔文探针力显微镜（AFM/KPFM）和X射线衍射（XRD）进行的全面结构与形态表征，证实了聚合物的结构完整性，并揭示了富PSS区域的湿度诱导溶胀，伴随聚合物链流动性增强，且在95% RH下层状间距从23.5 Å增至24.2 Å。这些结构变化直接影响谐振器的动态响应，导致由水吸附、质量负载和粘弹性阻尼共同作用驱动的系统共振频率下移。优化后的器件在20-70% RH范围内实现了155 Hz/% RH的灵敏度，优于此前报道的ME湿度传感器，同时表现出优于0.1% RH的分辨率以及出色的响应和恢复时间。这些结果确立了PEDOT作为磁弹性湿度传感器的高效功能涂层，并证明了一种简单、低成本、高灵敏度且具有实际环境与工业监测应用潜力的无线传感平台。
英文摘要
Magnetoelastic (ME) resonators provide an attractive platform for passive and wireless sensing, particularly for monitoring relative humidity (RH) in sealed or hard-to-access environments. In this work, we introduce ME humidity sensors functionalized with poly(3,4-ethylenedioxythiophene) sulfonate (PEDOT), marking the first application of this conductive polymer in ME-based humidity sensing. PEDOT films were deposited onto Metglas resonators via a simple drop-casting process, producing uniform and mechanically stable coatings. Comprehensive structural and morphological characterization by SEM, EDX, Raman spectroscopy, AFM/KPFM, and XRD confirmed the structural integrity of the polymer and revealed humidity-induced swelling of the PSS-rich domains, accompanied by enhanced polymer-chain mobility and an increase in the lamellar spacing from 23.5 Å to 24.2 Å at 95% RH. These structural changes directly affected the dynamic response of the resonators, leading to a systematic resonance-frequency downshift driven by the combined effects of water adsorption, mass loading, and viscoelastic damping. The optimized device achieved a sensitivity of 155 Hz/% RH in the 20 - 70% RH range, outperforming previously reported ME humidity sensors, while exhibiting a resolution better than 0.1% RH together with excellent response and recovery times. These results establish PEDOT as a highly effective functional coating for magnetoelastic humidity sensors and demonstrate a simple, low-cost, wireless sensing platform with high sensitivity and strong potential for practical environmental and industrial monitoring applications.
Comments24 pages, 9 figures, 1 table
