1 Characterization of self-assembled phosphonate monolayers on GaSb and InAsSb:Si surfacesCadiz Workshop Mario Bomers
2 Some characterization techniques in MontpellierProject overview hν hν hν Surface Enhacement Infra-Red Absorption SEIRA-Spectroscopy on biomolecules Bio-conjugation on surface Design and technology (plasmonic InAsSb/GaSb structure) Some characterization techniques in Montpellier XPS ESCALAB 250 Al Kα [ eV] Diameter: 400 µm Ellipsometer SOPRA GES-5E [ nm] FTIR (Vertex 70) + Microscope (Hyperion3000) (+ ATR-Ge-crystal) MCT-detector [ ̴ 1-23 µm]
3 => mid-IR reflectivity Exploiting the native oxide Effect of doping => mid-IR reflectivity Exploiting the native oxide => Phosphonate coupling Molecule Attachement “FDPA” Ultrasonic solvent cleaning (ethanol, chloroform) Plasma activation Immersion ( “FDPA” or “TEPA”) Baking (> 12h) “TEPA”
4 GaSb-surface 4 Plasma treatment + ultrasonic solvent cleaningUntreated reference sample 4
5 ATR-Spectroscopy 5 Plasma treatment + ultrasonic solvent cleaningUntreated reference sample 5
6 XPS-measurements 6 Plasma treatment + ultrasonic solvent cleaningUntreated reference sample 6
7 InAsSb:Si surface XPS ATR 7 Plasma treatment+ ultrasonic solvent cleaning Untreated reference sample XPS ATR 7
8 Conclusion Outlook Successful deposition of moleculesStable upon sonication (6 min) Potentially multi-layer deposition Outlook Additional characterization techniques, e.g. Thermogravimetric analysis (microbalance) Fluorescence Stability test under physiological conditions Deposition on nanostructures => SEIRA effect 8
9 Acknowlegements All the persons who have contributed in the different aspects of this work: Prof. Dr. Thierry Taliercio Dr. Aude Mezy (Sikémia) Dr. Laurent Cerutti Prof. Dr. Eric Tournié Dr. Richard Arinero Dr. Fernando Gonzales-Posada Dr. Valérie Flaud (XPS) Dr. Maria José Milla Rodrigo Dr. Franck Martin (Sikémia) Franziska Bahro The agencies which funded this work: European Commission (PROMIS) ANR (Supreme-B, EquipEx EXTRA) University of Montpellier, CNRS and IES