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Nickelocene as precursor of microporous organometallic-derived carbon and nickel oxide-carbon nanocomposite.
Title Nickelocene as precursor of microporous organometallic-derived carbon and nickel oxide-carbon nanocomposite.
Authors González-García, P.; Arenas-Esteban, D.; Ávila-Brande, D.; Urones-Garrote, E.; Otero-Díaz, L.C.
Journal J Colloid Interface Sci
DOI 10.1016/j.jcis.2016.11.034
Abstract

Microporous flower-like and spherical carbon particles, made of graphene-like layers, have been obtained via chlorination of nickelocene (Ni(C5H5)2). Their mechanism of formation, in terms of morphology and micro-nanostructure, has been followed from 200 to 900°C. Conventional transmission electron microscopy and high-resolution-TEM observations allow determining that their structure is made of highly disordered graphene-like layers. The Raman spectrum of the high temperature sample exhibits the characteristics D and G bands. The peak positions, the ratio of their intensities (ID/IG) and full width at half maximum suggest a high degree of disorder in the nanostructures. The calculated in-plane correlation length of these graphene-like layers is 1.15nm. In all the carbon particles, electron energy-loss spectroscopy shows sp(2) carbon bonding content higher than 95% and mass density in the range of 1.0-1.6g/cm(3). Textural studies show Type I adsorption isotherms with surface area of 922m(2)/g for the sample produced at 900°C. In addition, the basic hydrothermal treatment of the sample chlorinated at 600°C yields a composite material with NiO nanoparticles well dispersed within the carbon matrix.