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A Method for Systematic Electrochemical and Electrophysiological Evaluation of Neural Recording Electrodes
Published on: March 3, 2014
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Stabilized carbon coating on microelectrodes for scalable and interoperable neurotransmitter sensing
Yongli Qi1, Dongyeol Jang1, Jaehyeon Ryu1
1Thayer School of Engineering, Dartmouth College, Hanover, NH, USA.
Nature Communications
|April 8, 2025
Summary
We developed novel carbon-coated microelectrodes (CCMs) for real-time neurotransmitter monitoring. These scalable sensors achieve sub-second dopamine detection in vivo, advancing brain interfacing and diagnostics.
Area of Science:
- Neuroscience
- Electrochemistry
- Materials Science
Background:
- Real-time neurotransmitter monitoring is crucial for understanding brain function and developing treatments for neurological disorders.
- Current sensing technologies face limitations in spatiotemporal resolution and integration with neuronal recording.
- There is a need for advanced neuroelectrodes with improved performance and scalability.
Purpose of the Study:
- To develop high-performance voltammetry electrodes using a novel carbon coating approach.
- To enhance the electrochemical stability and scalability of neuroelectrodes for in vivo neurotransmitter detection.
- To create a dual-modal neural probe integrating neurotransmitter sensing with electrophysiological recording.
Main Methods:
- A unique carbon coating technique was applied to conventional neuroelectrodes, followed by mild annealing to improve electrochemical stability.
- Carbon-coated microelectrodes (CCMs) were fabricated and validated for in vivo dopamine detection in rodents using fast-scan-cyclic-voltammetry.
- Arrays of CCMs and a dual-modal neural probe integrating CCMs with electrophysiological recording sites were developed.
Main Results:
- Mild annealing significantly enhanced the electrochemical stability of graphene-based carbon coatings, creating fast-scan-cyclic-voltammetry-stable sensors.
- Sub-second detection of nanomolar dopamine in vivo was achieved using CCMs in rodents.
- Arrays of one hundred CCMs demonstrated high yield and uniformity.
- Dopamine fluctuations in the rat ventral striatum were shown to correlate with high gamma power with sub-second precision.
Conclusions:
- The developed carbon coating approach enables the creation of scalable and interoperable neuroelectrodes for advanced brain interfacing.
- The dual-modal probe allows for simultaneous neurotransmitter monitoring and electrophysiological recording, providing new insights into brain dynamics.
- These advances offer broad applicability for electrochemical diagnostics, interventions, and fundamental neuroscience research.
