Wearable Capacitive Pressure Sensor Based on MXene Composite Nanofibrous Scaffolds for Reliable Human Physiological Signal Acquisition
Wearable Capacitive Pressure Sensor Based on MXene Composite Nanofibrous Scaffolds for Reliable Human Physiological Signal Acquisition
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DOI：
10.1021/acsami.0c05819
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发表时间：
2020-05-13
影响因子：
9.5
通讯作者：
Park, Jae Yeong
中科院分区：
文献类型：
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作者：
Sharma, Sudeep;Chhetry, Ashok;Park, Jae Yeong
近年来，柔性、生物相容性和可拉伸的高灵敏度压力传感器在可穿戴电子设备和智能皮肤领域引起了极大的研究关注。然而，同时实现高灵敏度、低成本的传感器以及最佳的机械稳定性和用于细微生理信号监测设备的超低检测限是一个相当大的挑战。针对上述问题，在本文中，我们报告了通过将MXene（Ti 3C 2 Tx）/聚（偏二氟乙烯-三氟乙烯）（PVDF-TrFE）复合纳米纤维支架作为生物相容性聚-（3，4-亚乙基二氧噻吩）聚-苯乙烯磺酸盐/聚二甲基硅氧烷电极之间的介电层来容易地制造用于超低压力测量的高灵敏度和可靠的电容式压力传感器。该传感器的灵敏度为0.51kPa（-1），最小检测限为1.5Pa。此外，它还可以在宽压力范围（0-400 kPa）内进行线性检测，即使在极高压力（>167 kPa）下也可以进行10，000次循环的高可靠性检测。基于纳米纤维的传感器的灵敏度通过MXene加载而增强，从而与原始PVDF-TrFE支架相比，将介电常数提高到40，并将压缩模量降低到58%。所提出的传感器可用于通过监测生理信号（脉搏率、呼吸、肌肉运动和眼颤）来确定患者的健康状况，并且也代表了下一代人机接口设备的良好候选者。
In recent years, highly sensitive pressure sensors that are flexible, biocompatible, and stretchable have attracted significant research attention in the fields of wearable electronics and smart skin. However, there has been a considerable challenge to simultaneously achieve highly sensitive, low-cost sensors coupled with optimum mechanical stability and an ultralow detection limit for subtle physiological signal monitoring devices. Targeting aforementioned issues, herein, we report the facile fabrication of a highly sensitive and reliable capacitive pressure sensor for ultralow-pressure measurement by sandwiching MXene (Ti3C2Tx)/poly(vinylidene fluoride-trifluoroethylene) (PVDF-TrFE) composite nanofibrous scaffolds as a dielectric layer between biocompatible poly-(3,4-ethylenedioxythiophene) poly- styrene sulfonate /polydimethylsiloxane electrodes. The fabricated sensor exhibits a high sensitivity of 0.51 kPa(-1) and a minimum detection limit of 1.5 Pa. In addition, it also enables linear sensing over a broad pressure range (0-400 kPa) and high reliability over 10,000 cycles even at extremely high pressure (>167 kPa). The sensitivity of the nanofiber-based sensor is enhanced by MXene loading, thereby increasing the dielectric constant up to 40 and reducing the compression modulus to 58% compared with pristine PVDF-TrFE nanofiber scaffolds. The proposed sensor can be used to determine the health condition of patients by monitoring physiological signals (pulse rate, respiration, muscle movements, and eye twitching) and also represents a good candidate for a next generation human-machine interfacing device.