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The rapid expansion in the spectrum of two-dimensional (2D) materials has driven research efforts on the fabrication of 2D composites and heterostructures. Highly ordered structure of 2D materials provides an excellent platform for controlling the ultimate structure and properties of the composite material with precision. However, limited control over the structure of the matrix phase and its interactions...
Graphene oxide films are excellent structural and functional materials for their outstanding performance. Recent measurements reported widely scattered mechanical properties, which have been attributed to the difference in the chemistry and complex microstructures that rely on the fabrication process. In this work, we present an experimental study showing that the procedure of mechanical characterization...
Recently, our laboratory has developed a zeolite-templated synthesis route to microporous three-dimensional (3D) graphene-like carbons via lanthanum-catalyzed carbonization of ethylene. In the present work, we optimized the ethylene carbonization conditions for a zeolite X template, using an inexpensive Ca2+-ion catalyst instead of La3+-ion catalyst. This synthesis gave a high carbon yield based on...
The increasing demand for clean and efficient energy storage in portable electronics, electric vehicles, and smart energy grid has spurred attention to develop advanced battery systems. Complementing the high theoretical specific capacity of sulfur cathode (∼1672 mAh/g), environmentally benign, and low-cost, Li-S batteries can meet the myriad needs of inexpensive and high energy density energy storage...
Single-walled carbon nanohorn (CNH) has a unique structure of high electrical conductivity, which makes it potentially utilizing in energy storage. However, it is hardly used as supercapacitor alone due to enclosing internal structure and lack of faradic active sites. Here, we demonstrate the fabrication of nitrogen and oxygen dual-doped carbon nanohorn (N:CNH) via a facile arc-discharge method and...
Carbon-based cathodes are widely used in the biofilm-electrode reactor (BER) favoring a direct bioelectrochemical denitrification. However, little is known about how the surface chemistry of carbon affects the formation of bacterial biofilms on the electrode surface, which is fundamental to the functioning of BER for the nitrate removal. In the present study, graphite granules used in the three-dimension...
We report a family of novel microporous polymers constructed through covalent cross linkage of the buckyball and linear dialkyne through Cu-mediated, one-pot synthesis. A novel functionalization-polymerization pathway is described whereby Cu-mediated free radical species, generated in-situ, triggered multiple additions of the ditopic alkyne to C60. The multi-functionalized C60 species act as nodes...
Covalently bonded graphene/single-walled carbon nanotube (SWCNT) hybrid material can extend the excellent properties of graphene and SWCNT to three dimensions. We perform molecular dynamics simulations to investigate the mechanical properties of pillared vertically aligned carbon nanotube-graphene (VACNT-graphene) structure under uniaxial tensile and compressive loadings. The simulation results demonstrate...
In this work we compare Monte Carlo (MC) simulations of electron-transport properties with reflection electron energy-loss measurements in diamond and graphite films. We assess the impact of different approximations of the dielectric response on the observables of interest for the characterization of carbon-based materials. We calculate the frequency-dependent dielectric response and energy-loss functions...
Recently, broad spectral response phototransistors have drawn substantial attention due to their applications in the field of industry and science. However, it is difficult to synthesize appropriate photosensitive materials, which greatly limits their development. Integrating multicomponent bulk heterojunctions with high mobility materials to form hybrid planar-bulk heterojunction is a very effective...
Graphene is a material of great potential in a broad range of applications, for each of which specific tuning of the material's properties is required. This can be achieved, for example, by covalent functionalization. We have exploited two protocols for surface grafting, either by diazonium salts or by nucleophilic exchange, to perform graphene covalent modification directly on a copper substrate,...
In order to improve the mechanical properties of CBCFCs, the CBCFCs with in-situ grown SiC nanowires (SiCNW) were fabricated based on the chemical vapor reaction process and precursor impregnation and pyrolysis (PIP) process. The effect of multi-scaled reinforcements (micro-scaled carbon fibers and nano-scaled SiCNW) on the mechanical properties was investigated. The phase, microstructure and fracture...
Carbide-derived carbon (CDC) is an attractive electrode material for electrochemical applications because diverse pore textures and structures can be controlled by changing the properties of the precursor template and the synthesis conditions. Upon the tailoring of the micro-pore texture and graphitic structure of CDCs via a pre-vacuum treatment of a carbide precursor, the electrode shows a greatly...
Non-covalent functionalization of graphene with phospholipids is a promising technique for biosensing applications and intracellular delivery of analytical probes and drugs. However, molecular details of the self-assembly of lipids on graphene surface is still poorly understood and hard to control. There is a clear lack of understanding of why various kinds of lipid aggregates can form on graphene...
Cellular energy absorbing materials (EAMs) are used in a wide range of important applications from aircrafts to helmets. The energy absorption capacities (EAC) of the conventional EAMs (e.g., aluminum foams, steel foams, cellular bulk metallic glasses, and carbon nanotube buckypaper) are generally on the order of 1–100 J/g, and it remains a challenge to find new EAMs with higher EACs. Here we reveal...
Recently, single crystalline carbon nitride 2D material with a C3N stoichiometry has been synthesized. In this investigation, we explored the mechanical response and thermal transport along pristine, free-standing and single-layer C3N. To this aim, we conducted extensive first-principles density functional theory (DFT) calculations as well as molecular dynamics (MD) simulations. DFT results reveal...
The interfacial bonding strength between carbon nanotubes (CNTs) and the metal matrix in CNT/metal composites can be increased by depositing metal or metal oxide particles onto the CNT surface. In this study, the effect of the supported amorphous Al2O3 nanoparticles on the tensile strength of individual multi-walled CNTs (MWCNTs) synthesized by chemical vapor deposition has been investigated in situ...
For the first time, we report on the preparation of highly effective electrolyte additive by combining graphene oxide (GO) covalently functionalized with ammonium-based ionic liquid in dye-sensitized solar cell (DSSC). GO was modified in two-step, first, with 1–6, hexamethylenediamine then, the products were reacting with alkyl-halide. The effects of GO- hexamethylene tributyl-ammonium iodide and...
Graphene and carbon nanotube (CNT) (G/CNT) hybrid films have recently attracted great attention due to their potential of combining the merits of both one-dimensional (1D) and two-dimensional (2D) nanostructures. Here, we report a facile approach to form G/CNT hybrid films by thermal annealing of multiwalled carbon nanotube (MWNT) networks on copper foils. At elevated temperature and in the presence...
Aerographite is an ultralight porous material with a three-dimensional interconnected network structure consisting of hollow carbon fibers. The unique morphology is derived from using tetrapod-type zinc oxide (ZnO) as a template in fabrication process, demonstrating that aerographite's architecture can be designed through the choice of templates with the desired morphologies. Here we synthesized aerographite...
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