A Ni/CCF@PDMS-based flexible and electromagnetic interference-shielding surface electromyography/electrooculography sensor

Wearable flexible sensors are crucial for biopotential signal monitoring, but their performance is often hindered by electromagnetic interference (EMI) because of the weak nature of biosignals. Developing a sensor with both stretchability and electromagnetic shielding capabilities remains an important area of research. In this study, we proposed a wearable flexible sensor with outstanding EMI shielding and dependable signal acquisition for surface electromyography (sEMG) and electrooculography (EOG) signals. The flexible sensor employed a Ni/CCF@PDMS film with stencil-printed Ag/AgCl electrodes. The composite formed a continuous conductive network, and its microstructure and dielectric loss collectively enabled a maximum EMI shielding effectiveness of 39.82 dB across the X-band. The flexible sensor also demonstrated remarkable mechanical stretchability, withstanding strains of up to 55.6 % with a corresponding tensile stress of 1.49 MPa, ensuring dependable performance under dynamic motion. The Ni/CCF@PDMS film integrated with Ag/AgCl electrodes formed a flexible sensor that reliably and effectively captured biosignals generated by arm movement, hand gestures, and eye blinks. This work offers a promising strategy for developing EMI-resistant, flexible sensors suitable for wearable bioelectronic applications.