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A simple method for constructing shielded, low-capacitance glass microelectrodes

G Kottra, E Frömter

    Pflugers Archiv : European Journal of Physiology
    |November 1, 1982
    PubMed
    Summary
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    A new method creates shielded microelectrodes with low capacitance. This technique uses vapor deposition and a glass pipette for precise, small electrode tips, ideal for sensitive applications.

    Area of Science:

    • Materials Science
    • Electrical Engineering
    • Biomedical Engineering

    Background:

    • Microelectrodes are crucial for various sensing and recording applications.
    • Shielding is essential to reduce electrical noise and interference.
    • Low capacitance is desirable for improved signal integrity and performance.

    Purpose of the Study:

    • To present a novel, straightforward method for fabricating shielded low-capacitance microelectrodes.
    • To demonstrate the capability of producing microelectrodes with very small unshielded tip dimensions.
    • To highlight the low capacitance achieved with the new shielding technique.

    Main Methods:

    • Vapor deposition of a metal shield onto the inner surface of a glass pipette.
    • Sliding the prepared glass pipette over the microelectrode.

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  • Insulating the electrode tip using polystyrene dipping.

    • Main Results:

    • Successful production of shielded microelectrodes.
    • Achieved unshielded protruding tip dimensions as small as 10 micrometers.
    • Measured low capacitance between the electrode and shield, approximately 0.16 microF/cm shield length.

    Conclusions:

    • The presented method offers a simple and effective way to produce shielded low-capacitance microelectrodes.
    • The technique allows for microfabrication of small, precise electrode tips.
    • The resulting low capacitance is a significant advantage for advanced electronic and biomedical applications.