Aureau, Damien (2008) Interface silicium/couche organique: Maitrise des propriétés et fonctionnalisation. PhD thesis Physique, Laboratoire de Physique de la Matière Condensée, EP/X p.164.
Full text available as:
|
|
Abstract
Organic layers covalently grafted onto silicon surfaces are promising as model systems for fundamental research and applications: ultra thin layers, chemical or biochemical sensors. This work makes use of different characterization techniques for studying these systems. The influence of the system preparation on these various characteristics is examined. Surface morphology is controlled by AFM microscopy.
Chemical and electrical stability of the interface are investigated ex situ and in situ in contact with an electrolyte by photoluminescence, surface photovoltage, Mott-Schottky measurements and infrared spectroscopy in ATR Mode. Si-alkyl surfaces exhibit the same quality as Si-H surfaces with a higher stability, even in contact with buffer solutions up to pH 11. The effect of charges adsorbed at the surface has also been explored by a quantitative titration of grafted carboxyl-terminated monolayers. This titration shows that ionization of the carboxyl groups on surfaces starts around pH 6 and extends over more than 6 pH units: Observations are consistently accounted for by a model taking into account change in ion solvation at the surface and electrostatic interactions between surface charges.
An original method of functionalization of dense alkyl layers by treatment in oxidising plasma is presented. The characterization, in situ by infrared spectroscopy and ex situ by X-ray photoelectron spectroscopy, and the composition of the oxygen plasma give an evidence for the etching of the layers at the highest power and integrity of those at low power: a mechanism of chain functionalization is proposed.
| Item Type: | PhD Thesis (PhD) |
|---|---|
| PhD Supervisor: | Chazalviel, Jean-Noël |
| Date: | 30 October 2008 |
| Board of examiners: | Roca i caborrocas, Pere and Pradier, Claire-Marie and Guillemoles, Jean-François and Etcheberry, Arnaud and Rappich, Jörg and Allongue, Philippe and Chazalviel, Jean-Noël |
| Ecole Doctorale: | ED 447 ECOLE DOCTORALE DE L'ECOLE POLYTECHNIQUE |
| Discipline: | Physique |
| Collection (Fonds): | Ecole Polytechnique (EP/X) |
| Institution: | EP/X |
| Department: | Laboratoire de Physique de la Matière Condensée |
| Subjects: | 6. Chemistry, Physical Chemistry and Chemical Engineering 4. Materials Science, Mechanics and Mechanical Engineering 3. Physics, Optics |
| Uncontrolled Keywords: | Greffage chimique, Silicium, Surface hydrogénée, Hydrosilylation, Monocouche fonctionnalisée ultramince, Attachement covalent, Stabilité, Propriétés électroniques, Titration en surface, Fonctionnalisation, Plasma oxygène, Spectroscopie infrarouge, Xps, Afm, Photoluminescence, Photopotentiel, diagrammes Mott-Schottky, Mesures in situ., Chemical grafting, Silicon, Hydrogenated surface, Hydrosilylation, Ultrathin functionalized monolayer, Covalent attachment, Stability, Electronic properties, Surface titration, Functionalization, Infrared, Oxygen plasma, Infrared spectroscopy, Xps, Afm, Photoluminescence, Surface photovoltage, Mott-Schottky diagrams, In situ measurements. |
| ID Code: | 4611 |
| Deposited By: | Damien AUREAU |
| Deposited On: | 20 July 2009 |
Repository Staff Only: edit this item