One Step Preparation of Fe–FeO–Graphene Nanocomposite through Pulsed Wire Discharge

Abstract

The Fe-FeO-graphene nanocomposite material was produced successfully by pulsed wire discharge in graphene oxide (GO) suspension. Pure iron wires with a diameter of 0.25 mm and a length of 100 mm were used in the experiments. The discharge current and voltage were recorded to analyze the process of the pulsed wire discharge. The as-prepared samples-under different charging voltages-were recovered and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, and transmission electron microscopy (TEM). Curved and loose graphene films that were anchored with spherical Fe and FeO nanoparticles were obtained at the charging voltage of 8-10 kV. The present study discusses the mechanism by which the Fe-FeO-graphene nanocomposite material was formed during the pulsed wire discharge process.

High-Efficiency Production of Large-Size Few-Layer Graphene Platelets via Pulsed Discharge of Graphite Strips

“…He et al [45] synthesized boron nitride nanosheet/nanotube-Fe nanocomposite via pulsed discharge of iron wire coated by boron nitride powder. Furthermore, several metal/metal oxide/graphene nanocomposites were also prepared through pulsed discharge of different metal wires in graphene oxide suspension [46,47]. In addition, several reports have been documented to use pulsed wire discharge to synthesize carbon nanomaterials, including fullerene [48,49], carbon nanotube [50,51], and amorphous carbon [52].…”

Graphene Formation through Pulsed Wire Discharge of Graphite Strips in Water: Exfoliation Mechanism

“…This is in accordance with the typical result observed in few-layer graphene [ 29 , 30 ]. Moreover, Figure 5 b presents typical SEM images of a sample recovered at discharge voltage of 30 kV, demonstrating curved and extended ultra-thin carbon films which is the typical micromorphology of graphene [ 29 , 30 , 31 ] owing to the thermodynamically instability of two-dimensional materials.…”

“…To better understand the formation mechanism of nanoparticles during pulsed wire discharge, various techniques have been used to investigate the Joule heating process, product expansion, shockwave propagation, and plasma formation induced by pulsed discharge. Using a high-voltage probe, Rogowski coil, and oscilloscope, the discharge current and voltage data can be recorded to analyze phase transitions, such as melting, vaporization, and plasma formation [ 28 , 31 , 32 , 33 , 34 ]. These results can be further applied to estimate the energy input during the different processes and investigate the formation mechanism from the standpoint of time-resolved energy.…”

Preparation of Few-Layer Graphene by Pulsed Discharge in Graphite Micro-Flake Suspension

“…Using different mediums in the experiments, this technique has been utilized in multiple studies, such as pulsed wire discharge, liquid pulsed discharge, etc. Pulsed wire discharge (electrical wire explosion) refers to a conductive wire fixed between two electrodes melts and vaporizes during pulsed discharge, resulting in an explosion with high temperature and inner pressure [23,24]. The pulsed wire discharge method has been widely applied to synthesize nanomaterials.…”