Technologies laser pour l’élaboration de matériaux carbonés pour microsystèmes analytiques environnementaux

Laser technologies for the development of carbon materials for environmental analytical microsystems

• Auteur / Autrice : Chiranjeevi Maddi
• Direction : Florence Garrelie, Krzysztof Wolski
• Type : Thèse de doctorat
• Discipline(s) : Sciences et génie des matériaux
• Date : Soutenance le 05/04/2016
• Etablissement(s) : Lyon
• Ecole(s) doctorale(s) : École doctorale Sciences Ingénierie Santé (Saint-Etienne)
• Partenaire(s) de recherche : Etablissement opérateur d''inscription : Université Jean Monnet (Saint-Étienne ; 1969-....)
• Partenaire(s) de recherche : Laboratoire : Laboratoire Hubert Curien (Saint-Etienne ; 1995-....)
• Jury : Président / Présidente : Christophe Donnet
• Jury : Examinateurs / Examinatrices : Florence Garrelie, Corinne Champeaux, Pierre-Yves Tessier, Carole Chaix, Anne-Sophie Loir, Juan Carlos Sanchez Lopez
• Jury : Rapporteurs / Rapporteuses : Corinne Champeaux, Pierre-Yves Tessier

Mots clés

Mots clés contrôlés

Électrochimie

Électrodes de carbone

Lasers femtoseconde

Mots clés libres

Lasers ultracourts

Dépôt par laser pulsé

Matériaux à base de carbone

Nitrure de carbone amorphe

Graphène dopé

Composition structurelle et chimique

Electrochimie

Détection et fonctionnalisation

Ultrashort lasers

Pulsed laser deposition

Carbon based materials

Amorphous carbon nitride

N doped graphene

Structural and chemical composition

Electrochemistry

Detection and functionalization

Résumé

Technologies laser pour l’élaboration de matériaux carbonés pour microsystèmes analytiques environnementaux. Pas de résumé en français fourni

Amorphous carbon nitride (a-CzN) material has attractor much attention in research and development. Recently, it has become a more promising electrode material than conventional carbon based electrodes in electrochemical and biosensor applications. Nitrogen containing amorphous carbon (a-C:N) thin films have been synthesized by femtosecond pulsed laser deposition (fs-PLD) coupled with plasma assistance through Direct Current (DC) bias power supply. During the deposition process, various nitrogen pressures (0 to 50 Pa) and DC bias (0 to -350 V) were used in order to explore a wide range of nitrogen content into the film. The structure and chemical composition of the films have been studied by using Multi-wavelength (MW) Roman spectroscopy, electron energy-loss spectroscopy (EELS), X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HRTBM). The surface morphology has been studied by Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM). Increasing the nitrogen pressure or adding a DC bias induced an increase of the N content, up to 28 at.%. Nitrogen content increase induces a higher sp2 character of the film. However DC bias has been found to increase the film structmal disorder, which was detrimental to the electrochemical properties. Indeed the electrochemical measurern-ts, investigated by cyclic voltammetry (CV), demonstrated that the a-CzNfilms show better electron transfer kinetics, reversibility and excellent reproducibility than the pure a-C films. Electrochemical grafting from diazoniurn salts was successfully achieved on this film, with a surface coverage of covalently bonded molecules close to the dense packed monolayer of ferrocene