Ultrahigh Skin-Conformal and Biodegradable Graphene-based Flexible Sensor for Measuring ECG Signal
Keywords:
Skin-conformal, biomedical electronics, real-time, wireless system, recyclable.Abstract
With the development of information technology
as well as the arrival of the age of big data, researchers and engineers begin to pay attention to personal health data and biomedical electronics. At this time, real-time monitoring of the physiological signal of humans, such as electrocardiograph (ECG) signal, becomes vital to human beings. However, the traditional (Ag/AgCl) electrode has a couple of disadvantages such as poor stability, material waste, and heavy metal pollution.
Here, our group has proposed a novel flexible ECG sensor, which is fabricated of graphene and polyvinyl alcohol (PVA) film via double transfer technique. In this electrode, graphene has been introduced as an active layer, while PVA film is served as a flexible electrode substrate. As a result, this whole sensor exhibits excellent mechanical and electrical properties and it
can be biodegraded after use. The flexible sensor has a Young’s modulus of 8.598 MPa, a maximum strain of 135%, and a resistivity of 35.88Ω·m. Additionally, its resistance fluctuated within 20% strain. Then, an ancillary signal processing circuit is designed for analog signal collecting from the flexible sensor. The digital signal processing system is programmed including
analog digital converter (ADC), microprocessor, signal
transmission, and mobile application software. In conclusion, the whole system achieves the measurement and display of ECG signal in real-time and offers a better solution for biomedical electronics in the future.
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