Conventional electrodes used in BMI include the Utah Array, Michigan Array, and the Duke microwire array, which have been used in most BMI work so far.
I compile here a list of unconventional electrodes that I come across.
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Multifunctional fibers for simultaneous optical, electrical and chemical interrogation of neural circuits in vivo - Polina Anikeeva, MIT
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Syringe-injectable electronics - Charles Lieber, Harvard
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Stent-electrode - Thomas Oxley, University of Melbourne.
Measures only LFP up to 200Hz.