Flexible Sensing Electrodes: From Materials Design to Device Fabrication

Area of Science:

• Materials Science
• Biomedical Engineering
• Wearable Technology

Background:

• Wearable flexible sensing electrodes are vital for continuous physiological monitoring and advanced bioelectronic systems, especially post-pandemic.
• These electrodes offer advantages over rigid ones, including better mechanical compliance, lighter weight, and improved biocompatibility for stable signal acquisition during movement.

Purpose of the Study:

• This review systematically examines recent advancements in flexible sensing electrodes.
• It focuses on material systems, fabrication technologies, and practical applications to address challenges in optimizing performance.

Main Methods:

• Analysis of intrinsic properties and design strategies for flexible substrates, sensing layers, and encapsulation layers.
• Discussion of various fabrication methods such as printing, solution processing, photolithography, and laser-assisted manufacturing.
• Emphasis on scalability and engineering challenges associated with these fabrication techniques.

Main Results:

• Critical analysis of material systems highlights the need for synergistic advances in conductivity, flexibility, biocompatibility, and stability.
• Fabrication technologies are evaluated for their potential in scalable and efficient manufacturing of flexible electrodes.
• Representative applications showcase the potential of these electrodes in intelligent, multimodal systems.

Conclusions:

• Simultaneous optimization of key electrode properties remains a significant challenge.
• Future research should focus on scalable manufacturing and multimodal sensing capabilities.
• Commercialization of advanced flexible sensing electrodes requires further innovation in materials and fabrication.