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Hollow Microneedle-based Sensor for Multiplexed Transdermal Electrochemical Sensing

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Soft, Multifunctional MXene-Coated Fiber Microelectrodes for Biointerfacing.

Lingyi Bi¹, Raghav Garg², Natalia Noriega³

¹Department of Materials Science and Engineering and A. J. Drexel Nanomaterials Institute, Drexel University, Philadelphia, Pennsylvania 19104, United States.

|August 14, 2024

Summary

This summary is machine-generated.

Researchers developed a scalable method for creating flexible fiber microelectrodes using MXene coatings on nylon filaments. These durable, high-performance electrodes offer precise bioelectronic monitoring and modulation for investigating biological systems.

Keywords:

MXene chemical sensing dip coating electrical sensing fiber electrode neural stimulation

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Area of Science:

Bioelectronics
Materials Science
Nanotechnology

Background:

Flexible fiber microelectrodes are crucial for chronic investigation and modulation of biological tissues.
Current manufacturing methods lack scalability and reproducibility, limiting widespread use.
Existing designs often fail to capture both electrical and biochemical signals.

Purpose of the Study:

To develop a scalable and reproducible method for fabricating high-performance fiber microelectrodes.
To utilize MXenes for creating durable, flexible, and conductive fiber electrodes.
To demonstrate the sensing capabilities and in vivo applications of these novel microelectrodes.

Main Methods:

Coating commercial nylon filaments (30-300 μm) with MXene layers at high speed (15 mm/s).
Achieving low linear resistance (<10 Ω/cm) through continuous MXene deposition.
Batch processing MXene-coated filaments into free-standing fiber microelectrodes.

Main Results:

Fabrication of highly flexible and durable fiber microelectrodes with consistent performance, even when knotted.
Demonstration of excellent electrochemical properties and hydrogen peroxide (H2O2) sensing capabilities.
Successful in vivo (rodent) and ex vivo (bladder tissue) application showcasing versatility.

Conclusions:

The developed MXene-coating method offers a scalable and efficient approach to produce advanced fiber microelectrodes.
These microelectrodes enable precise bioelectronic monitoring and stimulation for diverse research applications.
This technology contributes to a deeper understanding of biological systems in health and disease.