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The low temperature nitrogen–graphite system, being relatively simple, presents, however, a significant challenge in accurate description of the experimental adsorption isotherm at 77 K, which is widely used as a reference system in characterization of porous carbon materials. So far all attempts to rigorously describe the isotherm failed to reproduce an experimentally observed sub-step at about 1 kPa...
The slit-shaped pore model is often assumed to be the most suitable to describe the pores in micro-/mesoporous carbon materials. This article analyses the suitability of this assumption when pore size distribution of carbon materials is calculated applying non-local density functional theory (NLDFT) to nitrogen adsorption isotherms. For further insight, three micro-/mesoporous carbide derived carbons...
Hybrid nanocarbons have been reported to have synergetic advantages in several mechanical and electrical applications. However, little is understood how two geometrically different nanocarbons can affect the response of a chemiresistive sensor. The study reports development of poly(dimethylsiloxane) (PDMS)/carbon nanotube (CNT) and nanocarbon black based novel chemiresistive sensors through a solvent...
Lightweight, three-dimensional (3D) cellular structures of graphene/silicon carbide (SiC) showing very low densities (<1.6 g cm−3) as compared to the dense skeleton (<3.2 g cm−3) have been fabricated by a filament-based printing technique known as Robocasting. These scaffolds have been assembled from pseudoplastic inks containing homogeneous mixtures of SiC ceramic powders and up to 20 vol.%...
In this research a graphite oxide (GO) was synthesized by electrochemical oxidation of natural graphite in aqueous solution of perchloric acid. The process of anodic oxidation of graphite was performed by linear sweep voltammetry (LSV) from the rest potential of electrode to 1.4 V. In consequence of the electrochemical treatment graphite was fully transformed yielding GO. Formation of GO was proved...
The heat transfer coefficient between a single water droplet and a multiwall carbon nanotube film (buckypaper) was measured for pristine and for carboxy functionalized nanotubes by infrared thermography. The value for non-functionalized nanotubes (438 Wm−2 K−1) was more than twice as large as that for functionalized ones (204 Wm−2 K−1) even though the water to nanotube affinity is larger in the latter...
Mixed ionic-electronic conductors (MIEC) are of growing interest for fuel cells, batteries and sensors. Here, by exploiting the unique properties of Li4C60 2D fulleride and poly(ethylene oxide) (PEO), we demonstrate the feasibility of a MIEC where the nature of transport can be tuned from ionic, to mixed, to almost entirely electronic, simply by changing the weight ratio of the two basic components...
Photooxidation plays an important role in organic synthesis. However, deep oxidation and degradation could reduce the product selectivity and the final yield, which is a crucial issue in the photooxidation reactions. Polymeric carbon nitride (C3N4) shows great potentials in the photocatalysis, but most improved methods make C3N4 show strong oxidation ability, which limits their applications in the...
In this study we report on the effective p-doping of chemical vapor deposition (CVD) graphene transferred from copper foil onto SiO2/Si and PET substrates. Tetrachloroauric acid (HAuCl4) is used to promote graphene doping with a direct correlation between its concentration and modification of graphene's electrical properties. The doping mechanism entails the charge transfer (CT) between AuIII ions...
Thermal transport across graphene/hexagonal boron nitride (h-BN) nanoribbon interface is investigated using nonequilibrium molecular dynamics method. It is found that the heat current runs preferentially from the h-BN to graphene domain, which demonstrates pronounced thermal rectification behavior in this heterostructure. The observed phenomena can be attributed to the resonance effect between out-of-plane...
Since various criteria including effective absorption intensity, broad absorption bandwidth, sufficient mechanical properties and excellent stability are required to meet the benchmark in practical service, here we propose a novel strategy to fabricate strong and thermostable polymeric graphene/silica textile composites for practical microwave absorption applications. For achieving homogeneous configuration,...
In this letter, we discuss the role of a thin diamond-like carbon (DLC) layer in the growth of carbon nanofibers. We show how the DLC layer acts as an additional carbon source during the pre-annealing stage and changes the nanofiber morphology significantly compared to the case without the DLC layer. Significant amount of carbon is dissolved into the Ni layer during the pre-annealing stage, which...
Glassy carbon (GC) is a widely used non-graphitizing carbon material, and has excellent resistances to physical and chemical attacks. However, as other carbon materials, GC is subject to the oxidation-induced deterioration. Many researchers have been trying to study the underlying oxidation mechanisms, but a convenient in-situ technique is unavailable. This paper aims to provide a facile method to...
In this paper, we reported the surface modification of multilayer carbon shell-encapsulated gold nanoparticles (Carbon Nanoparticles, or CNPs) via an oxygen plasma treatment approach and their subsequent functionalization with extraneous gold (Au) nanoparticles for Surface-enhanced Raman Scattering (SERS) sensing and DNA immobilization. The oxygen plasma treatment process led to purification of the...
A three-dimensional (3D) surface-enhanced Raman scattering (SERS) substrate is fabricated by decorating multi-walled carbon nanotubes (MWNTs) arrays with silver nanoparticles (AgNPs) on silicon, via magnetron sputtering and annealing method. The MWNTs-AgNPs hybrids with 3D structure increase the coverage of plasmonic nanostructures. The effect of inter-particle and inter-tube coupling creates a multitude...
In the process of developing carbon fibers (CF) from new sources or through new production methods, it is often a matter of great concern to assess the potential ability of the fiber under development to exert the high strength through the efforts for improving the production method. In this study, such a value is called intrinsic strength and has been determined from the strength of notched CF by...
Chemical vapor deposition (CVD) has recently been considered as the most reliable method to prepare high-quality monolayer graphene films, yet the as-grown graphene usually contains wrinkles and cracks or suffers from discontinuity. These defects can easily result in the shredding of large-sized graphene into small pieces even under a gentle disturbance. Herein, this work presents a cost-effective...
Carbon nanotube membranes and polymer composites are used in a wide range of applications including flexible electronics, energy storage devices, and water treatment. Here, we present a method to produce a dense network of regionally aligned multi-walled carbon nanotubes (MWCNT) on the surface of microporous substrates using a combination of electric field alignment and vacuum filtration. The effect...
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