摘要
Paper-based bioelectronics (e.g., biosensors) are of great significance for the monitoring of different human physiological signals (e.g., Electrocardiography (ECG)) due to their excellent degradability and cost-effectiveness in real-time wearable healthcare. In this work, a paper-based ECG electrode is achieved by simple drop-casting Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) (with 5 % glycerol) /Polyvinyl alcohol (PVA)/pullulan hybrid ink on Xuan paper substrate at room temperature (without any pre-processing steps (e.g., expensive Plasma treatment)). Significantly, the low surface resistance of 1.51 ± 0.013 Ω/square of PEDOT:PSS based paper electrode was obtained, which is much better than most previous PEDOT:PSS-based ink-coated fabrics electrodes (e.g., ∼5 Ω/square), indicating that it has great application potential in physiological signal monitoring. The prominent features of ECG signal are demonstrated for cardiorespiratory monitoring using Taiwan Food and Drug Administration (TFDA)-approved medical devices and proposed dry ECG electrodes. Since only Xuan paper (known as a cellulose-based material) and PEDOT:PSS-based hybrid ink (with biocompatibility) are used, the dry ECG electrode is easy to fabricate, economical, and environmentally sustainable. Furthermore, a flexible strain sensor was designed and fabricated using PEDOT:PSS-based Xuan paper for the detection of finger motions. As the flexible strain sensor, it can bear approximately 1000 times bending cycling (with a periodic load of 1 N (at a bending radius of about 1.5 mm and a speed of 50 mm/min)) with a relative resistance change ratio of 0.5. In addition, Fourier-transform infrared spectroscopy (FTIR) analysis is applied to understand changes in functional groups for the Xuan paper before and after deposition with the solution of PEDOT:PSS-based hybrid ink. The inherent multifaceted properties of PEDOT:PSS-based ink-treated Xuan paper (e.g., good electrical conductivity and eco-biodegradable feature) may open a new direction for integrating these proposed electrodes into green-electronics applications for the sustainable development of healthcare fields.