对自我供电的需求,灵活,近年来,可穿戴电子设备由于其更高的灵活性和可拉伸性,在生理和生物医学实时检测中的应用越来越多。这项工作制造了一个高度敏感的,使用静电纺丝技术的具有聚偏氟乙烯-四氟乙烯(PVDF-TrFE)纳米纤维的自供电可穿戴微装置。通过掺杂引入还原的氧化石墨烯(rGO)多壁碳纳米管(MWCNT)来改善聚合物的介电响应。通过聚合物链的拉伸和取向,改善了介电行为和压电效应。最外层是通过导电聚合物聚(3,4-亚乙基二氧噻吩)的化学气相沉积(CVD)获得的,以增强电导率和灵敏度。异质结构纳米复合材料包含在聚(3,4-亚乙基二氧噻吩)(PEDOT)上掺杂有rGO-MWCNTs的PVDF-TrFE,形成连续的自组装。压电压力传感器能够检测人体生理生命体征。压力传感器在1.0Pa至25kPa的传感范围内具有19.09kPa-1的高压灵敏度,和10,000次循环的优异循环稳定性。研究表明,压电压力传感器具有优越的传感性能,能够监测人体生命体征,包括心跳和手腕脉搏,咀嚼运动,语音识别,和眨眼信号。研究工作表明,该设备可能会消除金属传感器,并用于生物医学和个人医疗保健应用中的早期疾病诊断。
The demand for self-powered, flexible, and wearable electronic devices has been increasing in recent years for physiological and biomedical applications in real-time detection due to their higher flexibility and stretchability. This work fabricated a highly sensitive, self-powered wearable microdevice with Poly-Vinylidene Fluoride-Tetra Fluoroethylene (PVDF-TrFE) nano-fibers using an electrospinning technique. The dielectric response of the polymer was improved by incorporating the reduced-graphene-oxide (rGO) multi-walled carbon nano-tubes (MWCNTs) through doping. The dielectric behavior and
piezoelectric effect were improved through the stretching and orientation of polymeric chains. The outermost layer was attained by chemical vapor deposition (CVD) of conductive polymer poly (3,4-ethylenedioxythiophene) to enhance the electrical conductivity and sensitivity. The hetero-structured nano-composite comprises PVDF-TrFE doped with rGO-MWCNTs over poly (3,4-ethylenedioxythiophene) (PEDOT), forming continuous self-assembly. The
piezoelectric pressure sensor is capable of detecting human physiological vital signs. The pressure sensor exhibits a high-pressure sensitivity of 19.09 kPa-1, over a sensing range of 1.0 Pa to 25 kPa, and excellent cycling stability of 10,000 cycles. The study reveals that the
piezoelectric pressure sensor has superior sensing performance and is capable of monitoring human vital signs, including heartbeat and wrist pulse, masticatory movement, voice recognition, and eye blinking signals. The research work demonstrates that the device could potentially eliminate metallic sensors and be used for early disease diagnosis in biomedical and personal healthcare applications.