Practical and scalable synthesis of sulfonated graphene

Determination of amino groups on functionalized graphene oxide for polyurethane nanomaterials: XPS quantitation vs. functional speciation

“…Whereas physicists are still fascinated with the semiconducting properties, 1 room temperature quantum effects 2,3 and other unique phenomena of graphene and other low-dimensional carbon structures, chemists have found the chemistry of graphene somewhat poor 4 and turned back to related laminar materials bearing various (mainly oxygen-containing) functional groups, many of which were introduced years before Geim and Novoselov's discoverysee, e.g., Hummers and Offeman's 'graphitic oxide'. 5 The new generation of graphene derivatives include hydrogenated graphene (graphane), uorinated graphene (uorographene) 6 and graphene introduced with acetylenic chains (graphyne and graphdiyne), 7 as well as sulfonated graphene 8 or N-containing reduced graphene oxide (GO). 9 Introduction of the above-mentioned functional groups to the structure of GO improves not only the dispersibility and solubility of this material but also its reaction with other organic molecules, polymers and biological systems.…”

Pinacol Rearrangement and Direct Nucleophilic Substitution of Allylic Alcohols Promoted by Graphene Oxide and Graphene Oxide CO2H

“…The importance for catalysis of the presence in the material of attached hydrogen sulfate groups was confirmed performing different tests. The first study consisted of the preparation of sulfonated reduced graphene oxide (rGO–SO 3 H, 3.29 %S by elemental analysis, see the Supporting Information) from rGO (inactive catalytic material in the pinacol rearrangement). The freshly prepared rGO–SO 3 H showed good catalytic activity in two reaction cycles under the optimized reaction conditions (Scheme ).…”

Strong, Healable, and Recyclable Composite Paper Made from a Codispersion of Carbon Nanotube and Sulfonated Graphenal Polymer

“…(Figures S1 and S2 in the Supporting Information show the size distribution of SGP, mainly 10–20 µm, and the high level of functionalization by sulfonic acid groups.) Its >20 wt% water dispersion can still be a liquid while the 2 wt% GO dispersion has become a gel (Figure b), because of the high solubility of sulfonation, much better than other functional groups . Thus it provides us a new strategy to deal with the dispersion of CNT, owing to the attractive interaction between the delocalized π electrons of CNT and the sp 2 segment of SGP.…”