Polyelectrolyte-based wireless and drift-free iontronic sensors for orthodontic sensing

作者：Jia Song, Rusong Yang, Junli Shi, Xingxing Chen, Sai Xie, Zelong Liao, Ruijie Zou, Yupeng Feng, Terry Tao Ye, Chuan Fei Guo · 发表于：Science Advances · 年份：2025 · DOI：10.1126/sciadv.adu6086 · 被引用次数：54 · 研究领域：Advanced Sensor and Energy Harvesting Materials、Dielectric materials and actuators、Analytical Chemistry and Sensors

The real-time monitoring of health conditions of humans is a long-lasting topic, but there are two major challenges. First, many biomedical applications accept only implanted sensors. Second, tissue-like soft sensors often suffer from viscoelasticity-induced signal drift, causing inaccurate measurements. Here, we report a wireless and drift-free sensory system enabled by a low-creep polyelectrolyte elastomer. The system consists of the iontronic pressure sensors incorporating inductance-capacitance (LC) oscillators, exhibiting combined low drift ratio, high Q factor, high robustness to interferences, and wide-range measurement, superior to other capacitive sensors using regular dielectrics or ionogels. We have recorded 14-day orthodontic loads of two subjects using the system, showing pressure decreasing from 300 to 50 kPa and torque from 12.5 to 0.5 N·mm. The wireless, drift-free sensory system may be extended to other implants for long-term and accurate sensing.