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Related Experiment Videos

An almost completely shielded microelectrode

F Sachs, R McGarrigle

    Journal of Neuroscience Methods
    |December 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    A novel shielding technique for microelectrodes reduces stray capacity to under 50 fF. This method uses silver coating and mercury tip cleaning, followed by wax sealing for reliable insulation.

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    Area of Science:

    • Electrochemistry
    • Materials Science
    • Instrumentation

    Background:

    • Microelectrodes are crucial for electrochemical measurements.
    • Unshielded microelectrodes suffer from significant stray capacitance, affecting signal integrity.
    • Existing shielding methods may be complex or less effective.

    Purpose of the Study:

    • To develop an improved method for shielding microelectrodes.
    • To minimize stray capacitance in microelectrode tips.
    • To provide a reliable and efficient insulation technique.

    Main Methods:

    • Microelectrodes were coated with silver using a vacuum evaporator.
    • Silver was precisely removed from the electrode tip using a mercury ball.
    • Insulation was achieved by sealing the microelectrode tip with melted wax.

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    Main Results:

    • Shielding was successfully applied to within 20 microns of the microelectrode tip.
    • Stray capacitance was reduced to less than 50 femtofarads (fF).
    • The wax sealing method proved quick, easy, and reliable.

    Conclusions:

    • The presented method offers effective microelectrode shielding.
    • Reduced stray capacitance enhances measurement accuracy.
    • The wax sealing technique is a practical solution for microelectrode insulation.