Iron deposition on multi‐walled carbon nanotubes by fluidized bed MOCVD for aeronautic applications. Issue 7 (5th June 2015)

• Record Type: Journal Article
• Authors: Lassègue, Pierre; Noé, Laure; Monthioux, Marc; Caussat, Brigitte; Hoffmann, Patrik; Knez, Mato; Vahlas, Constantin; Alexandrov, Sergei
• Is Part Of: Physica status solidi. Volume 12:Issue 7(2015:Jul.)
• Page Start: 861
• Page End: 868
• Publication Date: 2015-06-05
• Subjects: Solid state physics -- Congresses; Solid state physics -- Periodicals; Solid state physics; Conference proceedings; Periodicals; 530.41
• DOI: 10.1002/pssc.201510036
• Languages: English
• ISSNs: 1862-6351

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The fluidized bed MOCVD process has been studied in order to uniformly deposit iron nanoparticles on the outer surface of multi‐walled carbon nanotubes (MWCNTs) tangled in balls of 388 µm in diameter. Using ferrocene as organometallic precursor at atmospheric pressure, various reactive atmospheres of deposition (under N₂, air and H₂) and an ozone O₃ surface pre‐treatment of MWCNTs were tested. Around 10 g Fe/100 g MWNCTs were deposited during each run. Under N₂ at 650 °C on the raw MWCNTs, nanoparticles formed of Fe and Fe₃C were deposited which have catalyzed the formation of carbon nanofibers (CNFs). 20 h of ozone (O₃) pre‐treatment improved the number and distribution of iron nanoparticles but without increasing the surface coverage of nanotubes. A more intense amorphous carbon deposit also appeared. Under H₂ at 550 °C, the amorphous carbon was partly eliminated but fewer iron nanoparticles were present. Under air at 450 °C, a part of the MWCNTs was lost and a Fe₂O₃ shell covered each remaining MWCNTs ball. New works are in progress to increase more markedly the surface reactivity of MWCNTs and to deposit pure iron. (© 2015 WILEY‐VCH Verlag GmbH &amp; Co. KGaA, Weinheim)</p> </abstract>