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Laser fabrication and characterization of sub-millimeter joints between polyimide and Ti-coated borosilicate glass

: Georgiev, D.G.; Sultana, T.; Mian, A.; Auner, G.; Herfurth, H.; Witte, R.; Newaz, G.


Journal of Materials Science : JMS 40 (2005), No.21, pp.5641-5647
ISSN: 0022-2461
ISSN: 1573-4803
Journal Article
Fraunhofer ILT ()

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.