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The degradation of polypropylene (PP) and PP-multiwalled carbon nanotube (PP-MWCNT) panels during environmental weathering resulted in an increased degree of crystallinity, making them brittle, and creating surface cracks. The degradation led to a breakdown of the panels and increased the potential for nanorelease. Thermal analysis revealed that the thickness of the test panels and reinforcement with...
We investigate the effects of embedded magnetic atoms on the edge states and spin-dependent transport properties of zigzag 6, 6, 12-graphyne nanoribbon (6, 6, 12-Z GYNRs) using non-equilibrium Greens functions combined with density-function theory. The results show that spin splitting occurs when doping magnetic atoms in the natural “holes” of the 6, 6, 12-Z GYNRs. Particularly, the half-metallicity...
The thermal transport properties of phonons in zigzag graphene nanoribbon (ZGNR) modulated by defect and alternating boron-nitride structure (BNS) are studied by nonequilibrium Greens function (NEGF) formalism combined with first-principles calculations of density-functional theory with local density approximation. Our calculations show that the thermal conductance in ZGNR with BNS is higher than...
Diamond/CeF3 composite film (DCCF) electroluminescence devices was fabricated on highly doping n-type silicon substrates by using plasma chemical vapor deposition techniques and vacuum electron beam evaporation techniques. The films were characterized by field emission scanning electron microscopy (FE-SEM), Energy dispersive spectrum (EDS), X-ray diffraction (XRD) and electroluminescence (EL) spectrum...
The thermal transport properties of electrons in graphene nanoribbon (GNR) subjected to strain fields are studied by non-equilibrium Green's function approach. The results show that the stretching of the carbon–carbon bond in strained GNR can enhance the ballistic thermal conductance of electrons. The enhancement originates from that the change of C–C bond length can modulate the nearest-neighbour...
An amorphous carbon thin film, with through-pores of several tens of nanometers in size, has been synthesized by annealing magnetron sputtered nitrogen-doped carbon thin films at elevated temperature in an inert atmosphere. Based on this nanoporous carbon film, we first report forming-free resistive switching in a two terminal device containing ready-made metal nanofilaments. Such nanoporous carbon-based...
A solution stabilization strategy that uses an easily removable media is critical to graphene (G) applications. Here, we demonstrate that highly stable graphene dispersions in low boiling point solvents such as isopropanol can be readily achieved by the uniform deposition of Ag nanoparticles (NPs) on the surface of graphene. Optimizing the synthesis parameters such as ultrasonic intensity, feeding...
Vertically oriented carbon nanosheet (VCNS)–carbon nanotube (CNT) hybrid films with a large area (∼4cm 2 ) were fabricated on Mo layers by using microwave plasma-assisted chemical vapor deposition technique. The Mo layers, which were deposited on Al 2 O 3 ceramic substrates through electron beam evaporation deposition, were pretreated by a laser-grooving technology (4lines/mm)...
New thermal and chemical schemes, which include (i) a modified thermal treatment, (ii) acid treatment in a HNO 3 bath and (iii) doping by immersing in a SOBr 2 solution, are developed to treat graphene films to improve the electrical conductivity and transparency. It is shown that a longer thermal treatment at 1100°C as well as additional acid and doping treatments reduce the sheet...
A soluble graphene oxide (GO) covalently functionalized with zinc phthalocyanine (PcZn), GO–PcZn, was synthesized by an amidation reaction. The formation of an amido bond between PcZn and GO has been confirmed by X-ray photoelectron and Fourier transform infrared spectroscopy. At the same level of linear extinction coefficient, GO–PcZn exhibited much larger nonlinear optical extinction coefficients...
Graphene-based transparent conducting films were prepared using the following method. A chemically-reduced graphene dispersion was synthesized and graphene films were prepared from it by transfer printing, followed by thermal treatment. The resulting graphene films possessed an excellent electrical conductivity with a high transparency. A sheet resistance lower than ∼2KΩ/sq and a transparency well...
A soluble polyhedral oligomeric silsesquioxane (POSS) functionalized multi-walled carbon nanotube (MWCNT) hybrid material (MWCNT/POSS) was synthesized, in which the POSS content was estimated to be 44wt.%. This material exhibits a remarkable optical limiting performance for nanosecond laser pulses at 532nm. Thermally-induced nonlinear scattering is the primary mechanism for the nonlinear optical response...
Gelcasting, an in situ consolidation colloid forming process, is promising for the manufacture of structural ceramics with various shapes. In this case, the gelcasting process was adopted to obtain carbon artifacts with complex shapes. The mesocarbon microbead (MCMB) that has self-sintering property was chosen as the starting material. In order to optimize the MCMB suspensions for gelcasting, the...
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