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Filtration-processed biomass nanofiber electrodes for flexible bioelectronics.

Daiki Ando^1,2, Tetsuhiko F Teshima^1,3, Francisco Zurita^1,3

¹Neuroelectronics, Munich Institute of Biomedical Engineering, Department of Electrical Engineering, TUM School of Computation, Information and Technology, Technical University of Munich, Hans-Piloty-Str. 1, 85748, Garching, Germany.

Journal of Nanobiotechnology

|November 19, 2022

Summary

Researchers developed a new fabrication method for biopolymer-based bioelectronics using chitosan nanofibers (CSNFs) and conductive materials. This technique enables the creation of neural interface electrodes for applications in bioelectronic devices.

Keywords:

Bioelectronics Biopolymers High-aspect-ratio materials Implantable Electrodes Membrane filtration

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Bridging the Bio-Electronic Interface with Biofabrication

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Published on: June 6, 2012

Area of Science:

Materials Science
Biotechnology
Bioelectronics

Background:

The demand for bioelectronics interfacing with biological systems necessitates advanced materials to bridge the gap between electronics and tissues.
Biopolymers, such as chitosan nanofibers (CSNFs), are promising next-generation materials for bioelectronics due to their biocompatibility, biodegradability, and sustainability.
Traditional fabrication methods often limit the application range of biopolymers.

Purpose of the Study:

To introduce a novel fabrication process for creating thin, large-area films of CSNFs integrated with conductive materials.
To demonstrate the compatibility of this method with various conductive materials like carbon nanotubes (CNTs), silver nanowires, and PEDOT:PSS.
To fabricate and test a CNT neural interface electrode for peripheral nerve stimulation.

Main Methods:

A facile filtration process using polyimide masks fabricated via laser ablation was employed to pattern conductive materials onto CSNF films.
The method was used to create feedlines of CNTs, silver nanowires, and PEDOT:PSS on nanofiber paper.
A neural interface electrode was fabricated using this process for in vivo testing.

Main Results:

The fabrication process successfully yielded conductive feedlines on CSNF substrates, compatible with conjugated and high-aspect-ratio materials.
A functional CNT neural interface electrode was fabricated.
Peripheral nerve stimulation was successfully demonstrated on a live locust's rapid extensor nerve.

Conclusions:

The presented fabrication method offers a viable approach for integrating conductive materials with biopolymer nanofibers.
This technique may facilitate the development of future bioelectronic devices based on sustainable biopolymer nanofiber platforms.
The successful neural interface electrode fabrication and stimulation suggest potential for advanced bioelectronic applications.