title: Critical parameters in exfoliating graphite into graphene.
abstract: Dispersing graphite into few-layers graphene sheets (GS) in water is very appealing as an environmental-friendly, low-cost, low-energy method of obtaining graphene. Very high GS concentrations in water (0.7 mg mL(-1)) were obtained by optimizing the nature of dispersant and the type of ultra-sonic generator. We find that a multi-step sonication procedure involving both tip and bath sources considerably enhances the yield of exfoliated GS. Raman and transmission electron microscopy indicate few-layers graphene patches with typical size of ∼0.65 μm in one dimension and ∼0.35 μm in the other. These were further employed in combination with water-dispersed CNTs to fabricate conductive transparent electrodes for a molecularly-controlled solar-cell with an open-circuit voltage of 0.53 V.
authors: Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
authors: Matat
authors: M
authors: Buzaglo
authors: Michael
authors: M
authors: Shtein
authors: Sivan
authors: S
authors: Kober
authors: Robert
authors: R
authors: Lovrinčić
authors: Ayelet
authors: A
authors: Vilan
authors: Oren
authors: O
authors: Regev