Uncharged Monolithic Carbon Fibers Are More Sensitive to Cross-Junction Compression than Charged

Area of Science:

• Materials Science
• Wearable Technology
• Robotics

Background:

• Textile-based wearable robotics require advanced sensing and energy materials for enhanced functionality, especially in physiological monitoring.
• Activated carbon cloth is a promising material due to its monolithic structure and high surface area, suitable for electron transfer and energy storage.
• The full potential of monolithic activated carbon cloth electrodes (MACCEs) in wearable applications for sensing and energy storage remains underexplored.

Purpose of the Study:

• To investigate the potential of monolithic activated carbon cloth electrodes (MACCEs) in smart wearables.
• To explore the combined sensing and energy storage capabilities of MACCEs.
• To understand the effect of electrical charging and electrolyte interaction on MACCE performance.

Main Methods:

• Fabrication and characterization of monolithic activated carbon cloth electrodes (MACCEs).
• Measurement of MACCE conductance and its response to electrolyte saturation and electrical charging.
• Evaluation of MACCE pressure-sensing capabilities across different charge levels and analysis of sensitivity variations.

Main Results:

• MACCE conductance increased by 29% upon saturation with Na2SO4 electrolyte and charging from 0 to 0.375 V.
• MACCE demonstrated reliable pressure sensing up to 28 kPa across all tested charge levels.
• Electrode sensitivity to compression decreased by 30% at higher potentials due to charge repulsion, offering controllable signal filtering.

Conclusions:

• Controlled charging and electrolyte interactions in MACCEs enable multifunctional roles in smart wearables, including energy transmission and pressure detection.
• The charge-dependent sensitivity of MACCEs allows for assessment of local electrode charge and can be utilized to filter irrelevant signals in garment applications.
• MACCEs present a viable material for developing advanced, multifunctional smart textiles for physiological monitoring and beyond.