One-step chemical vapor deposition synthesis of magnetic CNT–hercynite (FeAl2O4) hybrids with good aqueous colloidal stability

A multiwall carbon nanotube (MWCNT)/hercynite (FeAl2O4) hybrid nanomaterial was synthesized by one-step chemical vapor deposition (CVD) using acetylene as precursor and FeOx–AlOOH xerogel as catalyst. The hybrid material was composing by hercynite nanoparticles (diameter 10–50nm) intimately attached...

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Bibliographic Details
Published in:Carbon (New York) 2013-09, Vol.61, p.515-524
Main Authors: Morales, Noé J., Goyanes, Silvia, Chiliotte, Claudio, Bekeris, Victoria, Candal, Roberto J., Rubiolo, Gerardo H.
Format: Article
Language:English
Subjects:
Catalysis
Chemical vapor deposition (including plasma-enhanced cvd, mocvd, etc.)
Chemistry
Colloidal state and disperse state
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
General and physical chemistry
Materials science
Methods of deposition of films and coatings
film growth and epitaxy
Nanoscale materials and structures: fabrication and characterization
Nanotubes
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Physics
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:A multiwall carbon nanotube (MWCNT)/hercynite (FeAl2O4) hybrid nanomaterial was synthesized by one-step chemical vapor deposition (CVD) using acetylene as precursor and FeOx–AlOOH xerogel as catalyst. The hybrid material was composing by hercynite nanoparticles (diameter 10–50nm) intimately attached to the walls of the MWCNTs. The diameter of the MWCNTs was related to particle size of the catalyst. The hybrid nanomaterial exhibited a characteristic magnetic behavior that can be considered as a combination of superparamagnetism and ferromagnetism, with a saturation magnetization of 5.7emu/g at an applied field of 18kOe and a coercivity of 520Oe. The hybrid displayed a relatively low pHZPC (approx. 3.2) and formed very stable aqueous suspensions at pH 5.5. Controlled oxidation of the hybrid generated oxidized functional groups, as –OH and –COOH, and promoted the transformation of hercynite to hematite. Due to the high dispersibility of the hybrid in water, it presents an interesting potential as nanofiller for hydrophilic polymers.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2013.04.106