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

Abstract

Few-layer graphene nanosheets were produced by pulsed discharge in graphite micro-flake suspension at room temperature. In this study, the discharging current and voltage data were recorded for the analysis of the pulsed discharge processes. The as-prepared samples were recovered and characterized by various techniques, such as TEM, SEM, Raman, XRD, XPS, FT-IR, etc. The presence of few-layer graphene (3–9 L) in micrometer scale was confirmed. In addition, it is investigated that the size of recovered graphene nanosheets are influenced by the initial size of utilized graphite micro-flake powder. Based on the process of pulsed discharge and our experimental results, the formation mechanism of few-layer graphene was discussed. The influence of charging voltage on as-prepared samples is also investigated.

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

“…Various methods have been reported to synthesize graphene materials [9,[32][33][34][35][36] including mechanical exfoliation method, oxidation reduction method, chemical vapor deposition (CVD) method, liquid-phase exfoliation method, arc-discharge method, electrochemical exfoliation method, detonation method, pulsed wire discharge method, interlayer catalytic exfoliation, etc. Among them, several methods, including oxidation reduction method, CVD method, and interlayer catalytic exfoliation, have been reported to prepare large-size graphene.…”

Gram-scale preparation of black phosphorus nanosheetsviashock-induced phase transformation

“…Furthermore, after the shockwave propagates into BP powder, it reflects at the interface of BP and air, leading to a rarefaction wave. The reflected rarefaction wave induces tense stress 61,62 in the BP particles to exfoliate the black phosphorous layers to form BP nanosheets, which is similar to the shock exfoliation effect on graphitic layers. Thus, the formed BP ultrafine powders are fragmented induced by collision effect, and exfoliated by tensile effect and shear effect to form BP nanosheets.…”

Thermal conductivity enhancement in gold decorated graphene nanosheets in ethylene glycol based nanofluid

“…In nanosecond pulsed Nd:YAG laser ablation, the thermal wave has enough time to propagate into the target material and ablate it. In the graphite target (step 1), there is an induced vibration of graphite layers due to mismatch between the acoustic impedances of graphite and EG which causes tensile stress between graphitic layers 20 . For vibration effects that overcome the weak Van der Waals force between graphitic layers, graphite is exfoliated into few-layer graphene sheets (GNs) which are dispersed in EG 20 – 22 .…”

“…In the graphite target (step 1), there is an induced vibration of graphite layers due to mismatch between the acoustic impedances of graphite and EG which causes tensile stress between graphitic layers 20 . For vibration effects that overcome the weak Van der Waals force between graphitic layers, graphite is exfoliated into few-layer graphene sheets (GNs) which are dispersed in EG 20 – 22 . In step 2, the graphite target at the bottom of a glass-beaker now filled with GNs/EG liquid was replaced by a 1 mm thick gold target with 5 mm diameter.…”