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ref: Seymour-2011.06 tags: PEDOT Seymour electrode recording parylene date: 08-06-2014 22:39 gmt revision:3 [2] [1] [0] [head]

PMID-21301965[0] Novel multi-sided, microelectrode arrays for implantable neural applications.

  • There are problems with parylene multielectrode arrays:
    • water and salts will rapidly diffuse into the various interfacial boundaries
    • Interfacial delamination due to poor wet adhesion of parylene on metal
      • This possibly due to mechanical stress
      • causes excessive cross-talk or noise.
    • Parylene-C devices are prone to poor adhesion at either the dielectric to dielectric interface or at the dielectric to metal interface *** (Sharma and Yasuda 1982; Yasuda et al 2001)
  • solution: PPXCH 2NH 2 and PPXCHO -- reactive parylene (amine bonds?!)
  • PEDOT is absolutely essential for attaining reasonable performance / impedance from the 85um^2 gold electrodes.
    • Thermal noise on 280um^2 and 170um^2 Au electrodes was too high to record neurons.
    • AU thickness 0.5um.
  • Performed soak tests on their electrodes; the reactive parylene is good, but not sure if it's a worthy improvement.

____References____

[0] Seymour JP, Langhals NB, Anderson DJ, Kipke DR, Novel multi-sided, microelectrode arrays for implantable neural applications.Biomed Microdevices 13:3, 441-51 (2011 Jun)