PDMS/CNT electrodes with bioamplifier for practical in-the-ear and conventional biosignal recordings

Area of Science:

• Materials Science
• Biomedical Engineering
• Nanotechnology

Background:

• Emerging applications like wearable devices and flexible electronics require practical dry electrodes.
• Key challenges include easy fabrication, durability, and low-cost materials for dry electrode solutions.

Purpose of the Study:

• To propose and evaluate soft, dry electrodes made from polydimethylsiloxane (PDMS) and carbon nanotube (CNT) composites.
• To assess the performance of these novel electrodes against commercial standards for biosignal acquisition.

Main Methods:

• Fabrication of PDMS/CNT composite dry electrodes.
• Integration and comparative testing with conventional and in-house NTAmp biosignal instruments.
• Evaluation through electromyogram (EMG), electrocardiogram (ECG), and electroencephalogram (EEG) measurements.

Main Results:

• PDMS/CNT electrodes demonstrated biosignal reception capabilities comparable to commercial adhesive and gold-cup electrodes.
• Achieved a signal-to-noise ratio (SNR) in the 5-10 dB range, varying with stimulus type.
• The dry electrodes showed high durability and ease of fabrication.

Conclusions:

• The developed PDMS/CNT dry electrodes offer a viable, high-performance alternative to existing commercial electrodes.
• Their comparable performance opens possibilities for diverse applications, including vital sign monitoring and intelligent device control.
• This advancement supports the integration of biosignal acquisition in flexible and wearable technologies.