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Open AccessArticle

Characterization and Analysis of Metal Adhesion to Parylene Polymer Substrate Using Scotch Tape Test for Peripheral Neural Probe

by Seonho Seok 1,†, HyungDal Park 2,† and Jinseok Kim 2,*
1
Center for Nanoscience and Nanotechnology (C2N), University-Paris-Saclay, Orsay 91400, France
2
Center for Bionics, Korea Institute of Science and Technology (KIST), Seongbuk-gu, Seoul 02792, Korea
*
Author to whom correspondence should be addressed.
Both authors are equally-contributed to this manuscript.
Micromachines 2020, 11(6), 605; https://doi.org/10.3390/mi11060605
Received: 3 June 2020 / Revised: 18 June 2020 / Accepted: 19 June 2020 / Published: 22 June 2020
(This article belongs to the Special Issue MEMS Packaging Technologies and 3D Integration)
This paper presents measurement and FEM (Finite Element Method) analysis of metal adhesion force to a parylene substrate for implantable neural probe. A test device composed of 300 nm-thick gold and 30 nm-thick titanium metal electrodes on top of parylene substrate was prepared. The metal electrodes suffer from delamination during wet metal patterning process; thus, CF4 plasma treatment was applied to the parylene substrate before metal deposition. The two thin film metal layers were deposited by e-beam evaporation process. Metal electrodes had 200 μm in width, 300 μm spacing between the metal lines, and 5 mm length as the neural probe. Adhesion force of the metal lines to parylene substrate was measured with scotch tape test. Angle between the scotch tape and the test device substrate changed from 60° to 90° during characterization. Force exerted the scotch tape was recorded as the function of displacement of the scotch tape. It was found that a peak was created in measured force-displacement curve due to metal delamination. Metal adhesion was estimated 1.3 J/m2 by referring to the force peak and metal width at the force-displacement curve. Besides, the scotch tape test was simulated to comprehend delamination behavior of the test through FEM modeling. View Full-Text
Keywords: adhesion; thin film metal; parylene; neural probe; scotch tape test; FEM adhesion; thin film metal; parylene; neural probe; scotch tape test; FEM
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MDPI and ACS Style

Seok, S.; Park, H.; Kim, J. Characterization and Analysis of Metal Adhesion to Parylene Polymer Substrate Using Scotch Tape Test for Peripheral Neural Probe. Micromachines 2020, 11, 605.

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