Polymer-based Microelectrodes for Brain, Neural and Retinal Applications

Sohee Kim
Daegu Gyeongbuk Institute of Science and Technology (DGIST)
Dec. 1 10:40~11:10


This presentation will introduce penetrating-type and surface-type neural microelectrodes for neural signal recording or stimulation at various sites, such as brain, peripheral nerves, and retina. We developed MEMS-based microelectrodes to acquire neural signals from single neurons of in-vivo animals, such as action potentials and local field potentials. To achieve stable contact between the targeted neural tissue and the electrodes and to minimize foreign body responses, penetrating but flexible microelectrode arrays were developed based on a flexible material, polydimethylsiloxane (PDMS). Using the fabricated microelectrodes, neural signals from the motor cortex of rats and from the sciatic nerve of rabbit/beagle were successfully recorded. Also, we developed non-penetrating surface-type microelectrodes based on PDMS, in 2-dimensional or 3-dimensionsal structural forms. The PDMS-based surface-type microelectrodes have been further developed to minimize water and ion ingress into the polymeric substrate for potential long-term implantable applications. In addition, 3-dimensional microelectrode arrays for retinal stimulation will be introduced.



  • 2005, Dr.-Ing. (Ph.D.) in Mechatronics, University of Saarland, Saarbruecken, Germany
  • 2000, M.S. in Mechanical Engineering, KAIST
  • 1998, B.S. in Mechanical Engineering, KAIST


Professional Career

  • 2015-Present, Department of Robotics Engineering, DGIST
  • 2009-2015, Assistant/Associate Professor, Department of Medical System Engineering & School of Mechatronics, GIST
  • 2006-2009, Postdoctoral Researcher, Electrical and Computer Engineering, University of Utah