Data from: Ferromagnetically filled carbon nano-onions: the key role of sulfur in dimensional-, structural- and electric-control

A key challenge in the fabrication of ferromagnetically filled carbon nano-onions (CNOs) is the control of their thickness, dimensions and electric properties. Up to now literature works have mainly focused on the encapsulation of different types of ferromagnetic materials including alpha-Fe, Fe3C, Co, FeCo, FePd3 and others within CNOs. However no report has yet shown a suitable method for controlling both the number of shells, diameter and electric properties of the produced CNOs. Here we demonstrate an advanced chemical vapour deposition (CVD) approach in which the use of small quantities of sulfur during the pyrolysis of ferrocene allows for the control of 1) the diameter of the CNOs, 2) the number of shells and 3) the electric properties. We demonstrate the morphological, structural, electrical and magnetic properties of these new type of CNOs by using SEM, XRD, TEM, HRTEM, EIS and VSM techniques.