Light absorption of graphene plays an important role in optoelectronic applications. In this work, a series of reduced graphene oxide (RGO) dispersions containing flakes with various configurations are prepared, and their optical absorption coefficients are investigated. Our results suggest that the lateral size distribution, the mean number of layers per flake and the functional groups on RGO are all important factors influencing the absorption coefficient. We find the dispersion with a larger amount of small flakes (≤600 nm), as well as less layers per flake, gives a smaller absorption coefficient at 660 nm. Essentially, functional groups grafted on graphene flakes promote an eminent role in the absorption coefficient.

We report a facile and effective technique for the large-scale production of nano-sized graphene sheets via subjecting the microcrystalline graphite to ball milling. The products consist of single-or few-layer (#5 layers) graphene with lateral dimensions concentrated in the range of 100-200 nm. It displays a high intensity of photoluminescence at a wavelength of 339 nm and graphene dispersions at concentrations up to 1.22 mg ml À1 .

Compounding carbon black (CB) and polycarbonate (PC) at 300 °C can trigger a nontrivial air expansion inside the polymer matrix, resulting in many cavity‐wrapped particulates. When graphene nanoplatelets (GNP) are further added, graphene shows a unique capability in peeling the air sheath from the particulates, giving rise to nanocavities everywhere and a much improved toughness (100%).

We introduce a novel kind of submicron-sized reduced graphite oxide (μRGO) for the preparation of a transparent conducting film.

Epoxy composites with nanomagnetite-coated graphite nanosheets (GNs) aligned parallel to each other within the matrix were fabricated via magnetic field inducement. The ordered structure of the composite was characterized by atomic force microscopy (AFM) and X-ray diffraction (XRD). The GNs alignment of resulted in anisotropy of electromagnetic interference (EMI) shielding in composite in directions normal and parallel to main plains of the aligned GNs.