凯发

Graphene and graphene-based materials have attracted a lot of interest according to their excellent properties and potential applications. The development of cost-effective methodologies for volume production of graphene and graphene oxide has been the central topic recently. It is considered that the reduction of exfoliated graphene oxide offers a simple way to obtain graphene and it has the potential to bescalable.  This method also has the possibility to adjust the oxidation level and provides several processes for reduction of graphene oxide. In the present work, we prepare graphene-basedmaterials by thermal reduction of graphene oxide. We demonstrate that free-standing and paper-like films with A4 size can be obtained with restoration of graphitic lattice by high temperature annealing. The thermal reduced materials are studied with chemical, structural and thermal characterization, such as x-ray photo electron, Raman spectroscopy, X-ray diffraction, electron transmission microscopy,joule heating and laser flash methods. The thermal conductivity of the graphene-based films can reach to1000-2000 W/mK along in-plane direction with the film thickness ranged from 5-40 µm. We further demonstrate that our graphene-based films outperform high thermally conductive Cu foils and commercial graphitic papers produced from expanded graphite.This highly flexible and thermally-conductive graphene-based film can be easily integrated into high-power electronics and future stretchable/foldable devices and provides superior thermal management capabilities.