Polyelectrolyte-based wireless and drift-free iontronic sensors for orthodontic sensing (Source data for Fig. 2-5 of <b>SCIENCE ADVANCES</b> <b>adu6086</b>)

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 ionotropic pressure sensors incorporating LC oscillators, exhibiting a combined low drift ratio, high <i>Q</i>-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.实时监测人体健康状况是一项长期备受关注的研究课题，但目前存在两大核心挑战：其一，多数生物医学应用仅支持植入式传感器；其二，类组织软传感器常因黏弹性引发信号漂移，导致测量精度下降。本研究报道了一种基于低蠕变聚电解质弹性体（polyelectrolyte elastomer）的无线无漂移传感系统。该系统集成了搭载LC振荡器（LC oscillator）的离子型压力传感器，兼具超低漂移率、高Q因子（Q-factor）、优异的抗干扰性能与宽量程测量能力，性能优于采用常规电介质或离子凝胶（ionogel）的电容式传感器。我们利用该系统记录了两名受试者为期14天的正畸负荷数据，结果显示压力从300 kPa降至50 kPa，扭矩从12.5 N·mm降至0.5 N·mm。这款无线无漂移传感系统可拓展至其他植入式传感场景，实现长期精准的状态监测。