Thermal Decomposition of Co-Doped Calcium Tartrate and Use of the Products for Catalytic Chemical Vapor Deposition Synthesis of Carbon Nanotubes.

Igor P. Asanov , Tatyana I. Asanova , Lyubov Gennadievna Bulusheva , Elena V. Shlyakhova , Alexander Vladimirovich Okotrub , Emmanuel Flahaut (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

Thermal decomposition of Co-doped calcium tartrate in an inert atmosphere or air was studied using thermogravimetric analysis and X-ray absorption fine structure (XAFS) spectroscopy. It was shown that the powder substance containing 4 at.% of cobalt completely decomposes within 650-730 °C, depending on the environment, and the formation of Co clusters does not proceed before 470 °C. The products of decomposition were characterized by transmission electron microscopy, XAFS, and X-ray photoelectron spectroscopy. Surfaceoxidized Co metal nanoparticles as large as ∼5.6 ( 1.2 nm were found to form in an inert atmosphere, while the annealing in air led to a wide distribution of diameters of the nanoparticles, with the largest nanoparticles (30-50 nm) mainly present as a Co3O4 phase. It was found that the former nanoparticles catalyze the growth of CNTs from alcohol while a reducing atmosphere is required for activation of the latter nanoparticles. We propose the scheme of formation of CaO-supported catalyst from Co-doped tartrate, depending on the thermal decomposition conditions.

Mots clés: Carbon nanotubes; CCVD; Tartrate; EXAFS

Domaines: Matériaux

Igor P. Asanov, Tatyana I. Asanova, Lyubov Gennadievna Bulusheva, Elena V. Shlyakhova, Alexander Vladimirovich Okotrub, et al.. Thermal Decomposition of Co-Doped Calcium Tartrate and Use of the Products for Catalytic Chemical Vapor Deposition Synthesis of Carbon Nanotubes.. Journal of Physical Chemistry C, 2012, pp. 116 (1), pp.343-351. ⟨10.1021/jp2092169⟩. ⟨hal-03468651⟩