A Flexible and Highly Sensitive Pressure Sense Electrode Based on Cotton Pulp for Wearable Electronics

Area of Science:

• Materials Science
• Nanotechnology
• Wearable Electronics

Background:

• Flexible pressure sensors are crucial for wearable electronics but face challenges in achieving high sensitivity, flexibility, and electrochemical performance.
• Developing cost-effective and high-performance sensing electrodes remains a significant hurdle.

Purpose of the Study:

• To propose a novel and simple method for creating flexible sense electrodes using carbonized cotton fibers (CCF) and polydimethylsiloxane (PDMS).
• To evaluate the performance of CCF/PDMS electrodes for pressure sensing and energy storage applications.

Main Methods:

• A facile carbonization process was employed to convert cotton fibers into electrically conductive carbonized cotton fiber (CCF).
• CCF was integrated with polydimethylsiloxane (PDMS) to fabricate flexible sense electrodes.

Main Results:

• The CCF/PDMS electrode demonstrated high sensitivity (10.8 kPa^-1) and a wide response frequency (0.2-2.0 Hz).
• The sensor exhibited excellent durability over 900 cycles and successfully monitored human movement and pulse vibrations.
• CCF/PDMS electrodes showed a specific capacitance of 332.5 mF cm^-2 at 5 mA cm^-2, indicating potential for flexible supercapacitors.

Conclusions:

• The developed CCF/PDMS electrodes offer a promising solution for high-performance flexible pressure sensors in wearable devices.
• The material's properties also highlight its potential for flexible energy storage applications, such as supercapacitors.