Stable graphite exfoliation by fullerenol intercalation via aqueous route

Abstract

aGraphene is a wonder material possessing unique properties; however, graphene prepared by exfoliation of graphite has property to restack because of van der Waals interactions to form graphite. This restacking can be prevented by insertion of large molecules like fullerene, which not only exfoliates graphite layer but also prevents restacking of prepared graphene sheets. The present article also describes a mild method of graphite oxide synthesis (GO) for lower degree of oxidation resulting in less defected (ruptured carbon framework) graphene sheets. Exfoliation is performed by intercalation of large fullerene molecules by aqueous reaction of fullerene hydroxide (fullerenol) with the epoxy functionalities on graphite oxide to prepare fullerene intercalated graphite (G-Fol). Fullerene functionalization of GO to form G-Fol has been established by FTIR spectroscopy, UV-Vis spectroscopy, TGA and number of layers has been ascertained by Raman spectroscopy, XRD and HRTEM. Stable exfoliation of G-Fol has been confirmed by change in absorbance with time. Photoluminescence property of the material is also evaluated by fluorescence emission and excitation measurement at different excitation and emission wavelengths, respectively. The present article explains a new method of exfoliation of graphite to form stable functionalized graphene layers with fewer defects for future applications as buffer layer in electronic devices.

Role of Enhanced Hydrogen Bonding of Selectively Reduced Graphite Oxide in Fabrication of Poly(vinyl alcohol) Nanocomposites in Water as EMI Shielding Material

“…In selectively reduced graphite oxide, (referred as SRGO), XRD showed appearance of a peak at 2θ ∼ 24.50° ( d 002 = 0.36 nm) analogous to that noticed during preparation of reduced graphite oxide by using normal reducing agents (NaBH 4 , N 2 H 4 , hydroquinone heat treatments etc. ). , …”

Open-[60]fullerenols with water adsorbed both inside and outside

“…11 Furthermore, stable exfoliation of graphene could be achieved by reactions with [60]fullerenols in a water phase since intercalated [60]fullerenols inhibit the restacking of the graphene sheets. 12 Thus, it is of particular importance to clarify the adsorptive behaviour/structure of water on the [60]fullerene surface (Fig. 1) for the advanced design of [60]fullerenols for their biological and materials science applications.…”

Simple route for gram synthesis of less defective few layered graphene and its electrochemical performance

“…Therefore, the FTIR peaks of the as-synthesized FLGN matches well with previously published reports, conrming its successful synthesis. 21,22 On the other hand, an additional peak was also observed at 1448 and 1100 cm À1 , which is due to CO-H bending and C-O stretching, respectively, suggesting that a small quantity of oxygen functional groups was introduced into FLGN during the exfoliation process. Fig.…”