[3] L HAN, L W YAN, M H WANG et al. Transparent, adhesive, and conductive hydrogel for soft bioelectronics based on light-transmitting polydopamine-doped polypyrrole nanofibrils. Chemistry of Materials, 30, 5561-5572(2018).

[4] Q Y PENG, J S CHEN, T WANG et al. Recent advances in designing conductive hydrogels for flexible electronics. InfoMat, 2, 843-865(2020).

[5] J CHONG, C SUNG, K S NAM et al. Highly conductive tissue-like hydrogel interface through template-directed assembly. Nature Communications, 14, 2206(2023).

[6] C M TRINGIDES, N VACHICOURAS, LÁZARO I DE et al. Viscoelastic surface electrode arrays to interface with viscoelastic tissues. Nature Nanotechnology, 16, 1019-1029(2021).

[12] R JEGAN, K V ANUSUYA, E M GEORGE. Real-time ECG peak detection for heart rate measurement using wavelet packet transform. International Journal of Biomedical Engineering and Technology, 19, 244-254(2015).