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
α-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 approach in which the
use of small quantities of sulfur during the pyrolysis of ferrocene allows
for the control of (i) the diameter of the CNOs, (ii) the number of shells
and (iii) the electric properties. We demonstrate the morphological,
structural, electric and magnetic properties of these new types of CNOs by
using SEM, XRD, TEM, HRTEM, EIS and VSM techniques.

铁磁填充碳纳米洋葱（CNOs）制备中的一个关键挑战在于对其厚度、尺寸及电性能的调控。迄今为止，文献研究主要集中于将α-Fe、Fe₃C、Co、FeCo、FePd₃等各类铁磁材料包裹在CNOs内部。然而，目前尚无报道提出能够同时调控所制备CNOs的壳层数、直径及电性能的合适方法。本文提出一种先进的化学气相沉积（chemical vapour deposition）方法：在二茂铁热解过程中引入少量硫，即可实现对（i）CNOs直径、（ii）壳层数及（iii）电性能的调控。我们通过扫描电子显微镜（SEM）、X射线衍射（XRD）、透射电子显微镜（TEM）、高分辨率透射电子显微镜（HRTEM）、电化学阻抗谱（EIS）及振动样品磁强计（VSM）等技术，对这类新型CNOs的形貌、结构、电性能及磁性能进行了表征。