• Agostinho Moreira, Ja
• Castro Garcia, S.
• Sanchez Andujar, M.
• Garcia Fernandez, A.
• Antonia Senaris Rodriguez, Ma
• Centeno, Ta
• Mira, J.
• Yanez Vilar, S.
• Manuel Bermudez Garcia, Jm

Abstract

In this work, the incorporation of dicyanamide building blocks in organic-inorganic hybrid compounds is found to be a promising strategy for the synthesis of multiwalled carbon nanotubes embedded with magnetic nanoparticles (M@CNTs). Following a novel one-step, scalable and fast synthetic route, M@CNTs are obtained by simple calcination of the organic-inorganic hybrid perovskite [TPrA][M(dca)(3)] (TPrA = tetrapropylammonium, M = Ni2+ and Co2+, dca = dicyanamide). The resulting M@CNTs (M = Ni and Co) display a regular morphology and an essentially mesoporous network of similar to 250 m(2) g(-1), whereas the Co@CNT composite displays a broad pore size distribution (PSD) up to 6 nm, Ni@CNTs show a strictly controlled unimodal PSD, centered at around 5 nm. Monitoring of their thermal decomposition by X-ray diffraction, electron microscopy, thermogravimetric and spectroscopic analyses allows proposing a calcination mechanism and establishing the conditions to obtain optimal materials. Moreover, magnetization studies reveal a ferromagnetic behaviour of the obtained M@CNTs, with small coercive fields due to the size of the magnetic nanoparticles. In addition, preliminary assays of oil adsorption-desorption capacity reveal a promising potential for spilled oil recovery using this easily-synthesized materials. All these physicochemical properties make these composites good candidates for other nitrogen-rich CNT common applications.

Topics

• nanoparticle
• perovskite
• impedance spectroscopy
• pore
• compound
• Carbon
• x-ray diffraction
• nanotube
• Nitrogen
• composite
• electron microscopy
• magnetization
• thermolysis