Laser fabrication and characterization of sub-millimeter joints between polyimide and Ti-coated borosilicate glass |
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Authors: | Email author" target="_blank">Daniel?G?GeorgievEmail author Taslema?Sultana Ahsan?Mian Greg?Auner Hans?Herfurth Reiner?Witte Golam?Newaz |
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Affiliation: | (1) Center for Smart Sensors and Integrated Microsystems, College of Engineering, Wayne State University, Detroit, MI 48202, USA;(2) Fraunhofer Center for Laser Technology, 46025 Port St., Plymouth, MI 48170, USA |
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Abstract: | Laser-fabricated joints of sub-millimeter widths between biocompatible, dissimilar materials have the potential for application
as encapsulation of miniature implantable biomedical devices. In this work, we briefly describe the laser joining method of
a very promising system, polyimide/titanium-coated borosilicate glass, and present results from characterization of such laser
joints by means of mechanical failure (tensile) tests, optical and scanning electron microscopy, X-ray photoelectron spectroscopy
(XPS) and Raman spectroscopy. Our results suggest that the formation of the joints is a result of the creation of strong chemical
bonds between Ti-containing species and certain polymeric functional groups. Mechanical tensile strength failure testing showed
that such joints experience some degradation as a result of soaking in physiological solutions. This degradation is limited
and, even after relatively long-term exposure the joints retain considerable strength. |
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