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In this study, we propose a simple and cost-effective process to assemble composite film for thermal dissipation by combination of nitrogen-doped graphene nanosheets (N-GNS) and copper foil. We found that both nitrogen-doping contents and types of nitrogen bonding in GNS play important roles on heat dissipation performance. XPS results indicate that about 1.1–2.8 mol. % nitrogen atoms were successfully...
Ultraviolet (UV) Raman spectroscopy is a powerful technique for applications in fundamental and applied sciences of condensed matter and material science. To investigate double-resonant Raman scattering processes of graphene, we study the characteristic 2D Raman mode profiles of 1–4 layer graphene (supported and suspended) and graphite using both UV and visible excitation lasers at room temperature...
Ultra-thin single-walled carbon nanotubes (SWCNTs) with a narrow diameter distribution are prepared with a Fe catalyst under an optimized H2/He atmosphere by arc discharge first time. These SWCNTs were enriched with a pH–temperature controlled gel chromatography single-chirality separation process. The separation process uses the electrostatic interaction between the gel and the functional groups...
The demand for flexible and transparent barrier films in industries has been increasing. Learning from nature, borate ions were used to cross-link poly(vinyl alcohol) (PVA) and graphene oxide (GO) to produce flexible, transparent high-barrier composite films with a bio-inspired structure. PVA/GO films with only 0.1wt% GO and 1wt% cross-linker exhibited an O2 transmission rate <0.005ccm−2day−1,...
We prepare highly ordered flexible layers of graphene oxide (GO) on modified polyacrylonitrile substrates by the pressure-assisted self-assembly technique. This composite membrane shows excellent performance during the pervaporation separation of a 70wt.% isopropyl alcohol (IPA)/water mixture: 99.5wt% water in permeate and 2047gm−2h−1 permeation flux. Despite the specific GO deposition increase from...
Nanocasting was used to develop epoxy/graphene composites (EGCs) as corrosion inhibitors with hydrophobic surfaces (HEGC). The contact angle of water droplets on a sample surface can be increased from ∼82° (epoxy surface) to ∼127° (hydrophobic epoxy and EGC). It should be noted that EGC coating was found to provide an excellent corrosion protection effect on cold-rolled steel (CRS) electrode. Enhancement...
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