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 (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.