MXene-Based Flexible Electrodes for Electrophysiological Monitoring.

Area of Science:

• Materials Science
• Biomedical Engineering
• Nanotechnology

Background:

• Flexible electrodes are crucial for wearables and health monitoring.
• Traditional metal bioelectrodes suffer from poor mechanical strength and skin discomfort.
• There is a need for flexible surface electrodes with low electrochemical resistance and high conductivity.

Purpose of the Study:

• To develop a novel, flexible surface electrode using a MXene/polydimethylsiloxane (PDMS)/glycerol composite.
• To evaluate the electrochemical and mechanical properties of the developed electrodes.
• To assess their potential for electrophysiological sensing applications.

Main Methods:

• Fabrication of MXene/PDMS/glycerol composite electrodes with varying MXene content (15% and 20%).
• Characterization using electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV).
• Mechanical testing (Young's modulus, elongation) and bio-signal sensing from the skin.

Main Results:

• Composites showed favorable bulk impedances (280 and 111 Ω) and high conductivities (0.462 and 1.533 mS/cm).
• Demonstrated electrochemical stability with charge storage densities of 0.665 and 1.99 mC/cm².
• Exhibited excellent mechanical properties with Young's moduli of 2.61 and 2.18 MPa and elongations of 139% and 144%.

Conclusions:

• MXene-based bioelectrodes offer a promising solution for flexible and wearable electronics.
• The developed composite electrodes exhibit excellent potential for reliable bio-signal sensing.
• These findings pave the way for advanced applications in remote health monitoring and diagnostics.