Mild sonochemical exfoliation of bromine-intercalated graphite: a new route towards graphene
arXiv:0905.4451 · doi:10.1088/0022-3727/42/11/112003
Abstract
A method to produce suspensions of graphene sheets by combining solution-based bromine intercalation and mild sonochemical exfoliation is presented. Ultrasonic treatment of graphite in water leads to the formation of suspensions of graphite flakes. The delamination is dramatically improved by intercalation of bromine into the graphite before sonication. The bromine intercalation was verified by Raman spectroscopy as well as by x-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations show an almost ten times lower interlayer binding energy after introducing Br2 into the graphite. Analysis of the suspended material by transmission and scanning electron microscopy (TEM and SEM) revealed a significant content of few-layer graphene with sizes up to 30 m, corresponding to the grain size of the starting material.
arXiv comment10 pages 4 figures
References in corpus (8)
- Electric Field Effect in Atomically Thin Carbon Films
- The Raman Fingerprint of Graphene
- The SIESTA method for ab initio order-N materials simulation
- Efficient index handling of multidimensional periodic boundary conditions
- Two Dimensional Atomic Crystals
- Ultrathin epitaxial graphite: 2D electron gas properties and a route toward graphene-based nanoelectronics
- Raman scattering from high frequency phonons in supported n-graphene layer films
- Modeling of graphite oxide
Cited by in corpus (7)
- Adsorption of diatomic halogen molecules on graphene: A van der Waals density functional study
- Bromination of Graphene and Graphite
- A new route towards uniformly functionalized single-layer graphene
- Tuneable molecular doping of corrugated graphene
- First-principles modeling of the polycyclic aromatic hydrocarbons reduction
- Temperature oscillations of magnetization observed in nanofluid ferromagnetic graphite
- Charge transfer and weak bonding between molecular oxygen and graphene zigzag edges at low temperatures