All-Diamond Boron-Doped Microelectrodes for Neurochemical Sensing with Fast-Scan Cyclic Voltammetry

Area of Science:

• Neuroscience
• Materials Science
• Electrochemistry

Background:

• Implantable neurochemical sensors are crucial for brain research.
• Boron-doped diamond (BDD) electrodes offer excellent electrochemical properties.
• Limited research exists on BDD microelectrodes for in vivo neurotransmitter detection.

Purpose of the Study:

• To develop and characterize a freestanding, all-diamond microelectrode for neurotransmitter sensing.
• To evaluate the performance of the boron-doped diamond microelectrode (BDDME) for detecting serotonin (5-HT) and dopamine (DA).
• To optimize fabrication and testing protocols for next-generation BDDMEs.

Main Methods:

• Fabrication of a freestanding, all-diamond microelectrode using wafer technology.
• Electrochemical characterization using slow scan cyclic voltammetry (SSCV) and fast scan cyclic voltammetry (FSCV).
• In vitro testing for neurotransmitter detection, focusing on serotonin and dopamine.

Main Results:

• The all-diamond BDDME demonstrated batch fabrication feasibility and improved biocompatibility.
• BDDME exhibited enhanced sensitivity for serotonin (5-HT) detection compared to dopamine (DA).
• Achieved a limit of detection of 0.16 µM for 5-HT and 0.26 µM for DA using FSCV.

Conclusions:

• The developed BDDME is a promising candidate for advanced neurochemical sensing.
• The electrode's design and performance support its potential for future in vivo applications.
• Further development will focus on optimizing BDDMEs for next-generation implantable neurochemical sensing devices.