Electrically functionalized body surface for deep-tissue bioelectrical recording

Area of Science:

• Biomedical Engineering
• Materials Science
• Wearable Technology

Background:

• Non-invasive monitoring of deep-tissue physiological processes is hindered by signal attenuation and motion artifacts from conventional electrodes.
• High contact impedance and mechanical mismatch of current electrodes limit reliable bioelectrical signal acquisition, especially on irregular or hairy skin surfaces.

Purpose of the Study:

• To develop a novel biocompatible spray-on electronic skin for overcoming limitations of conventional electrodes in non-invasive physiological monitoring.
• To create intrinsically stretchable and mechanically adaptive thin films for conformal attachment to dynamic body surfaces.
• To enable robust and continuous monitoring of deep-tissue physiological processes, including biopotential and bioimpedance changes.

Main Methods:

• Directly spray-coating a biocompatible two-dimensional nanosheet ink onto the human body to form van der Waals thin films.
• Characterizing the mechanical adaptability and electrical properties of the spray-coated films on non-Euclidean and dynamic body surfaces.
• Comparing the performance of the electrically functionalized body surface with commercial electrodes in terms of contact impedance and motion artifact reduction.

Main Results:

• The spray-coated thin films form microscopically conformal, stretchable, and mechanically adaptive electrically functionalized body surfaces.
• The novel approach significantly reduces contact impedance and extrinsic motion artifacts compared to commercial solutions.
• Reliable acquisition of bioelectrical signals (biopotential and bioimpedance) from irregular body surfaces was achieved, enabling monitoring of deep-tissue activities.

Conclusions:

• Spray-coated, stretchable van der Waals thin films offer a promising solution for advanced non-invasive physiological monitoring.
• This technology significantly improves the reliability and robustness of bioelectrical signal acquisition from the body surface.
• The developed electrically functionalized body surface advances the capability for continuous monitoring of deep-tissue activities during natural body movements.