Catalytic chemical vapor deposition synthesis of double-walled and few-walled carbon nanotubes by using a MoO3-supported conditioning catalyst to control the formation of iron catalytic particles within an α-Al1.8Fe0.2O3 self-supported foam
| Autor: | Cordier, Anne, De Resende, Valdirene Gonzaga, Weibel, Alicia, De Grave, Eddy, Peigney, Alain, Laurent, Christophe |
|---|---|
| Přispěvatelé: | Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC), Department of Physics and Astronomy [Ghent], Universiteit Gent = Ghent University [Belgium] (UGENT), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Universiteit Gent - UGENT (BELGIUM) |
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Micro et nanotechnologies/Microélectronique
Matériaux et structures en mécanique CCVD [SPI.MECA.MSMECA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Materials and structures in mechanics [physics.class-ph] [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics Foam Carbon nanotube |
| Zdroj: | Journal of Physical Chemistry C Journal of Physical Chemistry C, American Chemical Society, 2010, 114 (45), pp.19188-19193. ⟨10.1021/jp105712q⟩ |
| ISSN: | 1932-7447 1932-7455 |
| DOI: | 10.1021/jp105712q⟩ |
| Popis: | International audience; α-Al1.8Fe0.2O3 and α-Al1.8Fe0.2O3-MoO3 self-supported foams are used as catalytic materials for the synthesis of carbon nanotubes by catalytic chemical vapor deposition. A MoO3-supported conditioning catalyst placed upstream in the reactor is more efficient than MoO3 present within the catalytic material in producing doublewalled and few-walled carbon nanotubes with fewer defects. It is shown that the corresponding modifications of the gas atmosphere (presence of H2O formed by the H2 reduction of MoO3 and, therefore, lower H2 and CH4 concentrations) allow one to limit more efficiently the release of the Fe catalyst from the oxide solidsolution foam, which results in the formation of fewer Fe nanoparticles, which, therefore, are less prone to undesirable growth. Thus, a MoO3-induced "solid-state" effect is demonstrated within the catalytic material without molybdenum species being themselves present within this material. This could lead to simplifications in the design of catalytic materials. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|