Up Close and Personal with the Injectrode 2

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Submitted by Jay Sy and Kevin Spencer of the Cima and Langer Laboratories at the Koch Institute

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We are currently building a neural probe, which we call the injectrode, in order to study neuropsychiatric disorders. One of the key components is a sensor used to measure neurotransmitters in the brain. We use organic silver ink, a clear solution that reacts to produce metallic silver, to create electrical junctions in our fabrication. In this particular case, we are connecting a seven micron carbon (the width of about a red blood cell) to a 75 micron tungsten filament (the width of a human hair).

This sample (1000x) was processed under conditions that produced needle-like silver platelets. This study allowed us to look at the structure of the silver coatings under different processing parameters.