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High-performing fiber electrodes based on a gold-shelled silver nanowire framework for bioelectronics
Kailin Zhang1, Chengqiang Tang1, Sihui Yu1
1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Institute of Fiber Materials and Devices, and Laboratory of Advanced Materials, Fudan University, Shanghai 200438, China. sunxm@fudan.edu.cn.
Journal of Materials Chemistry. B
|May 31, 2024
Summary
Researchers developed a new all-metal flexible fiber electrode using silver nanowires coated with gold. This biocompatible electrode shows high conductivity and potential for neural stimulation in bioelectronic applications.
Area of Science:
- Bioelectronics
- Materials Science
- Biocompatible Materials
Background:
- Flexible fiber electrodes are crucial for in vivo bioelectronic applications.
- Key requirements include high flexibility, electrical conductivity, and biocompatibility.
Purpose of the Study:
- To develop an all-metal, flexible, and biocompatible fiber electrode.
- To utilize a metal nanowire hybrid strategy for enhanced electrode properties.
Main Methods:
- Assembling silver nanowires on a freestanding framework.
- Plating the silver nanowires with a gold nanoshell to create inertness.
- Characterizing the electrode's mechanical and electrical properties.
Main Results:
- The fiber electrodes demonstrated a low modulus (∼75 MPa) and high electrical conductivity (∼4.8 × 10^6 S m^-1).
- The gold nanoshell coating prevented biotoxic silver ion leakage in physiological environments, ensuring biocompatibility.
- Successful demonstration as a neural electrode for sciatic nerve stimulation in mice.
Conclusions:
- The developed hybrid fiber electrode meets the requirements for flexible, conductive, and biocompatible bioelectronic devices.
- This technology shows significant potential for in vivo neural interfacing and other bioelectronic applications.
