De la réalisation de transistors à effet de champ à nanotubes de carbone par fonctionnalisation chimique spécifique à la mesure optoélectronique d'un bio-hybride nanotubes/protéines photosynthétiques.

Grégory Schmidt 1
1 LISO - Laboratoire Interfaces et Surfaces d'Oxydes
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
Abstract : The manuscript presents my work concerning the making and the study of a nanotube/photosynthetic protein bio-hybrids for optoelectronic and photovoltaic applications. Indeed, photosynthetic proteins are super dyes with optoelectronic properties optimized by nature. So, we decided to check the possibility of protein integration in electronic device using carbon nanotubes as a nano-probe of protein properties. During our work, the problem of making efficient carbon nanotubes field-effect transistors appeared. To solve this problem, we chose to enhance transistor performance using selective functionalisation by diazonium. Indeed, the diazonium-to-SWNT coupling has been recognized from the beginning as selective for metallic but not enough for sorting proposes. In the aim of increasing the selectivity, we decided to study the coupling mechanism which was still mostly unknown. Using kinetic studies, we showed that the reaction procedes through a chain mechanism. In parallel, we identified the radical intermediates either by direct detection using electronic resonance spectroscopy or using a radical trap. In particular, the origin of the reaction selectivity was precisely determined and our work paves the way for selectivity improvement. Using background about diazonium-nanotube coupling mechanism, we improved the reaction selectivity using a Lewis base. Indeed, the addition of a Lewis base allows the formation of a diazoester from diazonium which increases dramatically the reaction selectivity for metallic nanotubes. Using this method, we realized efficient carbon nanotubes field-effect transistors in high-volume. Moreover, this innovative method was patented. Finally, promising results in the photosensitization of nanotubes by photosynthetic proteins (photosystem I) were obtained. Indeed, we observed that the photo-induced dipolar moment created in proteins changed the electrical characteristics of carbon nanotubes field-effect transistors. The protein performance allowed increasing the optical sensitivity of the device. In particular, the protein activity proved robust in spite of protein fragility even in non biological conditions. Finally, this thesis opens the way to the protein integration in electronic or photovoltaic devices.
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Contributor : Grégory Schmidt <>
Submitted on : Monday, January 18, 2010 - 9:32:07 PM
Last modification on : Wednesday, January 23, 2019 - 2:38:31 PM
Long-term archiving on : Friday, June 18, 2010 - 1:05:21 AM

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Grégory Schmidt. De la réalisation de transistors à effet de champ à nanotubes de carbone par fonctionnalisation chimique spécifique à la mesure optoélectronique d'un bio-hybride nanotubes/protéines photosynthétiques.. Matériaux. Université Paris Sud - Paris XI, 2009. Français. ⟨tel-00448421⟩

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