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Metallic plasma sprayed coatings are widely used in the aerospace industry to repair engine components. However, the inherent defects in coatings limit such repairs and reduce the service life of the parts. In this study, to improve the serviceability and mechanical properties of plasma sprayed coatings, multi-layered graphene oxide (GO) have been introduced as a reinforcement. The novelty of this...
We have systematically investigated the structural and magnetic properties of N-doped graphene oxide by density-functional theory. Our results reveal that both the magnetic properties and the defect stability can be significantly affected by the bonding environment. Graphitic N defect has higher formation energy than both pyridinic and pyrrolic N defects. The pyrrolic N becomes more stable when its...
Double-gated graphene field effect transistors (GFETs) have been fabricated using the graphene grown by CVD method as channel conductor and the organic ferroelectric P(VDF-TrFE) film spin-coated as top gate insulator. An interesting method for efficiently modulating the charge transport characteristics of graphene films by introducing double-gated graphene field-effect transistor structure and organic...
We report the temperature and gate voltage dependent electrical properties of PZT gated graphene field effect transistors (PZT-GFETs) in the vacuum atmosphere. The PZT-GFETs exhibit p-type characteristics which are attributed to the chemical doping induced the Fermi level shifting below the Dirac point. Meanwhile, it also shows a large memory window. The temperature dependencies of the source-drain...
New chemical sensors based on lanthanide emission that enable sequential detection of two targets in live cells have been developed. The indicator molecules (unsaturated europium complexes) were covalently immobilized on carbon quantum dots (CQDs), and a water soluble fluorescent nano-probe (CQDs-DTPA-Eu) with biocompatibility was fabricated. A novel stepwise assembly method was used to generate unique...
Graphene nanoplatelets (GNP) reinforced tantalum carbide (TaC) composites are exposed to a high temperature plasma flow in order to evaluate the effects of GNP on the oxidation behavior of TaC at conditions approaching those of hypersonic flight environments. The addition of GNP is found to suppress the formation of the oxide layer by up to 60%. The high thermal conductivity of GNPs dissipates heat...
The reported hydrogen uptake of carbon nanotubes (CNTs) has been the subject of much controversy. We have measured the hydrogen uptake capacity of different types of CNTs using a volumetric measurement setup specifically-designed for CNTs. It was found that under a pressure of ∼12MPa and at room temperature, the hydrogen storage capacity of the CNTs is less than 1.7wt.%, which is far below the benchmark...
The construction of vapor-grown carbon fiber (VGCF) conductive networks through the self-assembly process in a poly(vinylidene fluoride) (PVDF) melt was investigated. Depending on real-time tracing of the variation of electrical resistivity with isothermal treatment time, the properties and possible assembly mechanism of PVDF/VGCF composites were evaluated. It was found that the self-assembly velocity...
In this article, the temperature dependence of electrical resistivity is studied for carbon black (CB)/ultra-high molecular weight polyethylene (UHMWPE) composites. A new positive temperature coefficient (PTC) material with a very low percolation threshold is produced by the hot compaction method. The very low percolation threshold can be attributed to the segregation of CB in the interfacial regions...
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