Understanding Oxygen Bubble‐Triggered Exfoliation of Graphite Toward the Low‐Defect Graphene

Abstract

Although graphene has been developed and widely used in many fields over the past decades, the effect of oxygen (O2) on the exfoliation of graphite is still unclear. Here, a simple bubble‐triggered exfoliation method is employed for controllable synthesis of graphene nanoplatelets (GNPs) with low‐oxidation level and high electrical conductivity. The exfoliation process is studied and a formation mechanism for the synthesis of the low‐defect GNPs is proposed. The results show that the synergistic effect of H2SO4 and H2O2 plays an important role in the procession of exfoliation of graphite. Moreover, density functional theory (DFT) simulations exhibit that H2O2 would preferentially adsorb on the edge of graphite, indicating the possibility to initiate the exfoliation by O2. In the whole process, some oxygen free radicals can be released from H2O2, resulting in some O2 and oxygen functional groups formed on the graphite edge, and which can finally lead to the fast exfoliation of graphite. In addition, a time‐dependent temperature profile under an applied voltage of 5 V exhibits a steady‐state with temperature up to 275 °C. Overall, this work elucidates the selectivity of gas bubble absorbed on the side edge of graphite and presents a potential application for high‐electrical conductivity graphene.

Trace-H2O2 Boosting the Reaction Kinetics of H2SO4 Intercalation into Graphite for the High-Oxidation Efficiency Preparation of Graphene Oxide for Na Ion Storage

“…In this process, the intercalation of H 2 SO 4 into graphite may be hindered since O 2 and H 2 O molecules that formed following H 2 O 2 decomposition could cointercalate into graphite and enhance the steric hindrance, resulting in the limited intercalation of H 2 SO 4 . Recently, our work further disclosed that the synergistic effect of H 2 SO 4 and H 2 O 2 plays an important role in increasing the interlayer space of graphite . We found the relationship between the stage of H 2 SO 4 -GIC products and the amount of H 2 O 2 , in which the relatively low amount of H 2 O 2 benefits the forming of the low stage H 2 SO 4 -GIC product .…”

“…26, 30 Although there is some H 2 O content in H 2 O 2 , according to previous reports, 28,31 few waters can be absorbed by concentrated H 2 SO 4 , in which there is no impact on reaction of H 2 SO 4 intercalation into graphite. Therefore, the intercalation reaction of H 2 SO 4 and graphite was focused on the effect mechanism of O* and O 2 .…”

“…Recently, our work further disclosed that the synergistic effect of H 2 SO 4 and H 2 O 2 plays an important role in increasing the interlayer space of graphite. 28 We found the relationship between the stage of H 2 SO 4 -GIC products and the amount of H 2 O 2 , in which the relatively low amount of H 2 O 2 benefits the forming of the low stage H 2 SO 4 -GIC product. 29 Thus, it is interesting to study the effect of trace-H 2 O 2 on the intercalation process of H 2 SO 4 into graphite during GO preparation.…”

Mechanical Behavior of Blisters Spontaneously Formed by Multilayer 2D Materials

“…In a range of biological and engineering systems, blisters form when a thin solid layer separates/delaminates from the substrate that it adheres to or is brought into contact with a substrate with some liquids or gases trapped at the layer–substrate interface. [ 1–3 ] Recently, blisters formed by atomically thin solids—2D materials—have spurred significant interest. [ 4,5 ] Initially, 2D material blisters are considered as a nuisance in device applications as they are pockets of contaminants to obstruct contact between adjacent materials.…”

Funcionalización de textiles mediante la aplicación de grafeno

“…Otros autores han llevado a cabo esta técnica utilizando diferentes disolventes como N-metilpirrolidona [156], dodecilbencenosulfonato de sodio [158] o una mezcla entre N-metil-2-pirrolidona y N-ciclohexil-2-pirrolidona [159]. Hay otras estrategias para este método, como la exfoliación por burbujas [160,161].…”