Biopotential signals are extremely useful in assessing organ function and diagnosing diseases. This study proposes a highly flexible, conductive, antibacterial, and self-adhesive silver nanorods (AgNRs) embedded polydimethylsiloxane (PDMS) dry electrode for long-term electrocardiogram (ECG) monitoring with portable instrumentation. We use a unique glancing angle deposition method to fabricate AgNRs and embedded them in a biocompatible PDMS matrix. These electrodes do not cause skin irritation even after several hours of use and work efficiently without skin preparation. These AgNRs-PDMS electrodes have an electrical resistivity of 10⁻⁷ Ω m and a skin contact impedance of 93.9 ± 0.7 kΩ to 6.2 ± 3.7 kΩ for frequencies ranging from 40 Hz to 1 kHz, which is around 18% less than most conventional Ag/AgCl wet electrodes. The fabricated electrodes have a signal-to-noise ratio of 12 dB, comparable to that of a conventional Ag/AgCl electrode. A signal acquisition circuit is designed to detect ECG signals combined with proposed dry electrodes and a wireless monitoring device. Finally, real-time ECG signals are displayed on a mobile phone via an Android application. These AgNRs-PDMS dry electrodes, in combination with the portable wireless device, may be used in future clinical studies that require real-time and long-term ECG monitoring.

生物电位信号在评估器官功能和诊断疾病方面非常有用。本研究提出了一种高度灵活、导电、抗菌和自粘的银纳米棒 (AgNRs) 嵌入聚二甲基硅氧烷 (PDMS) 干电极，用于使用便携式仪器进行长期心电图 (ECG) 监测。我们使用独特的掠射角沉积方法来制造 AgNRs 并将它们嵌入生物相容性 PDMS 基质中。即使使用数小时后，这些电极也不会引起皮肤刺激，并且无需皮肤准备即可有效工作。这些 AgNRs-PDMS 电极的电阻率为 10 ^-7Ω m 和 93.9 ± 0.7 kΩ 至 6.2 ± 3.7 kΩ 的皮肤接触阻抗，频率范围为 40 Hz 至 1 kHz，比大多数传统的 Ag/AgCl 湿电极低约 18%。制造的电极的信噪比为 12 dB，与传统的 Ag/AgCl 电极相当。信号采集电路设计用于检测与建议的干电极和无线监测设备相结合的 ECG 信号。最后，实时心电信号通过 Android 应用程序显示在手机上。这些 AgNRs-PDMS 干电极与便携式无线设备相结合，可用于未来需要实时和长期 ECG 监测的临床研究。