Simultaneous Transfer and Doping of CVD-Grown Graphene by Fluoropolymer for Transparent Conductive Films on Plastic

Chemical doping can decrease sheet resistance of graphene while maintaining its high transparency. We report a new method to simultaneously transfer and dope chemical vapor deposition grown graphene onto a target substrate using a fluoropolymer as both the supporting and doping layer. Solvent was used to remove a significant fraction of the supporting fluoropolymer, but residual polymer remained that doped the graphene significantly. This contrasts with a more widely used supporting layer, polymethylmethacrylate, which does not Induce significant doping during transfer. The fluoropolymer doping mechanism can be explained by the rearrangement of fluorine atoms on the graphene basal plane caused by either thermal annealing or soaking in solvent, which Induces ordered dipole moments near the graphene surface. This simultaneous transfer and doping of the graphene with a fluoropolymer increases the carrier density significantly, and the resulting monolayer graphene film exhibits a sheet resistance of similar to 320 Omega/sq. Finally, the method presented here was used to fabricate flexible and a transparent graphene electrode on a plastic substrate.X117976sciescopu

Modulus, fracture strength, and brittle vs. plastic response of the outer shell of arc-grown multi-walled carbon nanotubes

The fracture strengths and elastic moduli of arc-grown multi-walled carbon nanotubes (MWCNTs) were measured by tensile loading inside of a scanning electron microscope (SEM). Eighteen tensile tests were performed on 14 MWCNTs with three of them being tested multiple times (3x, 2x, and 2x, respectively). All the MWCNTs fractured in the "sword-in-sheath'' mode. The diameters of the MWCNTs were measured in a transmission electron microscope (TEM), and the outer diameter with an assumed 0.34 nm shell thickness was used to convert measured load-displacement data to stress and strain values. An unusual yielding before fracture was observed in two tensile loading experiments. The 18 outer shell fracture strength values ranged from 10 to 66 GPa, and the 18 Young's modulus values, obtained from a linear fit of the stress-strain data, ranged from 620 to 1,200 GPa, with a mean of 940 GPa. The possible influence of stress concentration at the clamps is discussed

An overview of magnetic material: Preparation and adsorption removal of heavy metals from wastewater

The issue of wastewater impurities along harmful heavy metal ion is rather critical. In this matter, there is a necessity for developed techniques to wastewater treatment. Recently, magnetic-based carbon materials application for the metal ion removal from water has significantly gotten attention. For years, researchers design techniques that emphasize on the magnetic material, in order to attain comprehensive benefit. This paper provided detailed review on the synthesis of magnetic materials. In addition, compressive review on heavy metal was narrated. Hence, magnetic-based material has proven excellent adsorption capacity for waste treatment