2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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TechConnect Summit
Clean Technology 2008

Development of IR bio-sensors based on nanostructured GeSbSe chalcogenide glass thin films grown by the oblique angle deposition technique

R.J. Martin-Palma, H. Wang, M.C. Demirel, C.G. Pantano
The Pennsylvania State University, US

chalcogenide, glancing angle, biosensor, biofunctionalization, poly-(p-xylylene)

Chalcogenide glasses are characterized by high transmission in the infrared (IR) region of the spectrum, making them suitable for active and passive IR devices. In the present work, the oblique angle deposition (OAD) technique is used to grow nanostructured GeSbSe thin films, which adds extra functionality to the unique properties of these glasses by expanding their range of optical and morphological properties. The high surface area GeSbse layers were subsequently polymerized with thin poly-(p-xylylene) films. This process leads to thin film structures with a relatively large concentration of surface amine groups available for bio-molecule immobilization. Additionally, the deposition of GeSbSe thin films at large evaporation angles (close to 90º with respect to the substrate normal) leads to increased surface area which in turn boosts surface bio-activity. IR sensing is used to determine the presence/absence and surface concentration of biomolecules immobilized onto the thin film structures.

Nanotech 2008 Conference Program Abstract