2016
DOI: 10.1088/0957-4484/27/50/505601
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Graphene reflux: improving the yield of liquid-exfoliated nanosheets through repeated separation techniques

Abstract: Scalable production of graphene through liquid-phase exfoliation has been plagued by low yields. Although several recent studies have attempted to improve graphene exfoliation technology, the problem of separating colloidal nanosheets from unexfoliated parent material has received far less attention. Here we demonstrate a scalable method for improving nanosheet yield through a facile washing process. By probing the sedimentation of liquid-phase exfoliated slurries of graphene nanosheets and parent material, we… Show more

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Cited by 4 publications
(3 citation statements)
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“…In particular, the easy processing nature can enable GO to be constructed into different dimensions (1D fiber, 2D film, and 3D aerogel) through the reduction reaction. According to the exfoliated mechanism (the generation of oxygen-containing functional groups between graphene interlayer), the chemical exfoliation can be classified into the oxidation–reduction method, electrochemical method, and liquid phase exfoliation method. In this respect, the electrochemical method can ensure the formation of graphene aqueous solution by intercalating sodium dodecyl sulfate (SDS) into the graphite electrode . Additionally, the liquid phase exfoliation method is also demonstrated to synthesize few-layer graphene by employing a surfactant solution . However, the low overall yields of the electrochemical and liquid phase exfoliation methods are the major bottlenecks.…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…In particular, the easy processing nature can enable GO to be constructed into different dimensions (1D fiber, 2D film, and 3D aerogel) through the reduction reaction. According to the exfoliated mechanism (the generation of oxygen-containing functional groups between graphene interlayer), the chemical exfoliation can be classified into the oxidation–reduction method, electrochemical method, and liquid phase exfoliation method. In this respect, the electrochemical method can ensure the formation of graphene aqueous solution by intercalating sodium dodecyl sulfate (SDS) into the graphite electrode . Additionally, the liquid phase exfoliation method is also demonstrated to synthesize few-layer graphene by employing a surfactant solution . However, the low overall yields of the electrochemical and liquid phase exfoliation methods are the major bottlenecks.…”
Section: Introductionmentioning
confidence: 99%
“…22 Additionally, the liquid phase exfoliation method is also demonstrated to synthesize few-layer graphene by employing a surfactant solution. 23 However, the low overall yields of the electrochemical and liquid phase exfoliation methods are the major bottlenecks. The oxidation−reduction method (also called the Brodie approach and the Hummers approach) mainly utilizes the strong oxidant (potassium chlorate (KClO 3 ) or potassium permanganate (KMnO 4 )) to oxidize graphite under strong acid conditions, 20 and then the GO is reduced to rGO with the aid of chemical reductants.…”
Section: Introductionmentioning
confidence: 99%
“…Beside artificial construction of highly active h-BN catalysts, exfoliation of bulk ones into few-layered ones seems to be more efficient and easily to be realized. Most of exfoliation methods of h-BN nanosheets focused on either solid-phase mechanical method or liquid-phase exfoliation [32][33][34][35][36]. However, both of them have some inherent shortages, including ultra-low yield, expensive equipment, and toxic chemical reagents, etc [37][38][39][40][41][42][43].…”
Section: Introductionmentioning
confidence: 99%