BMSEED
BioMedical Sustainable Elastic Electronic Devices
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Technology

Overview of Technology

Properties of BMSEED’s electrodes:

  • Flexibility and Softness
  • Capability for Electrical Recording and Stimulation
  • Mechanical robustness: stretch, bend, twist

BMSEED’s electrodes consist of two key components: 

  1. a soft elastomeric silicone (usually PDMS)
  2. a microcracked gold film.

Microcracked gold films offer a combination of desirable properties:

  •  low electrical resistance
  •  compatibility with standard microfabrication technology
  •  low elastic modulus
  •  low fatigue
  •  inexpensive production equipment

 

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electron microscopy image of a microcracked gold film

BMSEED has an exclusive license for all applications of this film (US Patent 7,491,892)


Why is it important that the gold film is microcracked?

Microcracked gold film On PDMS

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Microcracked gold films can be stretched by over 70% while remaining electrically conducting

Smooth (no features) gold film on PDMS

Smooth gold films rupture at strains less than 2% and cease to electrically conduct.


 

Controlling the morphology is therefore very important. To control the morphology of the gold film requires knowledge of the process parameters that affect the morphology:

• elastic modulus
• pre-treatment of the silicone
• film thickness
• deposition temperature
• adhesion layer

See our references for more information.