Selective mono-facial modification of graphene oxide nanosheets in suspension

Abstract

Graphene oxide (GO) is selectively functionalized on one face to prepare Janus platelets which are characterized by various spectroscopic and microscopic techniques. With this methodology, Janus GO platelets can be prepared without the use of a solid substrate and the two platelet faces can be orthogonally modified in a one-pot reaction.

Graphene-based two-dimensional Janus materials

“…The pH-responsive Janus platelets with the two faces orthogonally functionalized with PS and poly(acrylic acid) (PAA) were demonstrated by McGrail et al 125 . Acrylate functionalities were first appended to both faces of GO using acrylonitrile in an acidic aqueous environment to give Acr-GO-Acr.…”

Fullerene grafted graphene oxide with effective charge transfer interactions

“…The sp 2 hybridised carbon pattern extending in two dimension helps in introducing different types of functional groups covalently by addition or substitution reactions. Attachment of small/large functional molecules like, diazonium salts, alkyl isocyanates, polymers, porphyrin and also bulky fullerene via substitution or additions reactions on GO have been reported to exploit the advantages by altering its properties and finding potential applications in several areas [7,8,9,10,11,12,13,14,15]. Some research has also been carried out to attach bulky fullerene molecules (like polyhydroxy fullerene, pyrrolidine fullerene, methanofullerene etc.)…”

Polythioether Particles Armored with Modifiable Graphene Oxide Nanosheets

“…GO‐stabilized miniemulsions have been used to prepare a number of different assemblies; our group recently used the assembly of GO at the oil–water interface in Pickering‐type miniemulsions to selectively and orthogonally functionalize each face of the nanosheet with different polymers to yield so‐called Janus nanosheets . Thickett and Zetterlund prepared hollow GO spheres by polymerizing styrene across the surface of GO‐stabilized miniemulsions, while Zhang et al used polymer‐stabilized GO miniemulsions to fabricate polystyrene shells .…”

“…GO-stabilized miniemulsions have been used to prepare a number of different assemblies; [25][26][27][28][29][30][31] our group recently used the assembly of GO at the oil-water interface in Pickering-type miniemulsions to selectively and orthogonally functionalize each face of the nanosheet with different polymers to yield so-called Janus nanosheets. [ 32 ] Thickett and Zetterlund prepared hollow GO spheres by polymerizing styrene across the surface of GO-stabilized miniemulsions, [ 26 ] while Zhang et al used polymer-stabilized GO miniemulsions to fabricate polystyrene shells. [ 33 ] Alternatively, Gudarzi and Sharif polymerized the oil phase of GO-stabilized miniemulsions to prepare armored polymer particles of poly(methyl methacrylate) 5-45 μm in diameter, [ 34 ] while Zhao and co-workers prepared GOcoated polystyrene particles 0.5-3 μm in diameter using a similar method.…”