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Spectroscopie infrarouge exaltée de surface pour la détection de composés organiques dissous dans le milieu marin

Abstract : This work concerns the study of Surface Enhanced InfraRed Absorption (SEIRA) spectroscopy dedicated to the detection of dissolved organic compounds in seawater. The aim of this work is to develop a synthesis process to fabricate sensors based on SEIRA effect on chalcogenide glass substrate, which will pave the way to integrated component for SEIRA spectroscopy. Two kind of deposition methods were studied. On the one hand, island gold nanoparticles were obtained by DC sputtering. On the other hand, electron beam lithography was used for the synthesis of gold nano-antennas. In the future, the chalcogenide glasses used as substrate could be shaped into sophisticated photonic systems such as optical fibers or planar waveguides. The infrared measurements of a self-assembled monolayer of 4-nitrothiophenol show a significant SEIRA effect. Indeed, the results show an enhancement factor of about 100 with sputtered gold films and reach about 106 with gold nano-antennas. Sputtering technique is easy to handle, can cover areas of several centimeters square, but the reproducibility of the enhancement is difficult to ensure and the enhancement factor is low. Electron beam lithography is much more complex to implement, the coated surface is still limited to a few tens of microns square and the plasmon band is highly localized. However, this technique enables to achieve much higher enhancement factors.
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https://tel.archives-ouvertes.fr/tel-00732964
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Submitted on : Monday, September 17, 2012 - 2:46:57 PM
Last modification on : Wednesday, November 29, 2017 - 9:48:57 AM
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  • HAL Id : tel-00732964, version 1

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Frédéric Verger. Spectroscopie infrarouge exaltée de surface pour la détection de composés organiques dissous dans le milieu marin. Matériaux. Université Rennes 1, 2012. Français. ⟨NNT : 2012REN1S046⟩. ⟨tel-00732964⟩

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