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The earliest stages of soot formation in flames are believed to involve the formation of small, nanoscale clusters of polycyclic aromatic hydrocarbon molecules. The structure of these clusters is still highly uncertain, however, impeding the construction of quantitative models of soot inception and growth. To provide insight into the structure of incipient soot, we produced nanoclusters of hydrocarbon...
The shuttle effect caused by polysufides dissolution and diffusion in electrolyte solutions severely hinders the practical application of LiS batteries. To overcome this problem for achieving long cycle life and high rate performance, anchoring materials are highly desirable. In this work, for the first time, we explore the anchoring behaviors of polysulfides on C3B and C3N monolayers with reference...
While metal is commonly used to construct electromagnetic metamaterials, herein carbon aerogel constitutes the first example of application as building blocks for metamaterials of low density. The carbon aerogel is synthesized by the sol-gel polymerization of resorcinol with formaldehyde followed by supercritical fulid drying and carbonization. The resulting nanostructure of carbon aerogel is adjusted...
Recently, the electrogenerated chemiluminescence (ECL) of carbon nanodots (C-dots) have been detected and the signal is applied for sensitive determination of environmental pollutes and biological active molecules. A few of researches have been reported on the mechanisms of C-dots that the electro-generated cation and anion intermediates undergo electron-transfer annihilation to give off strong ECL...
The formation of a hybrid crystalline fibrils (shish), in which the carbon nanotubes (CNTs) are coated by polymer extended chain, is an effective route to couple polymers and CNTs together but needs extreme conditions like fiber spinning or stirring CNT/polymer solution. In this work, both the hybrid shish and homogeneous shish have been achieved in the extruded sheets of poly (l-lactic acid) (PLA)/CNT...
Electron beam lithography (EBL) was used for preparing nanostructured reduced patterns on the GO paper surface, while preserving its mechanical resistance and flexibility. Different EBL parameters, like dose and time of exposure for patterning were tested. SEM analysis showed the consequent increase of contrast of the reduced stripes on the patterned regions due to the increase of electron beam doses...
With the aim of understanding three-dimensional graphene-based frameworks in detail, a realistic structure model of zeolite-templated carbon (ZTC) is constructed by using computer simulation, and its simulated physical properties are compared with experimental data. The proposed structure model provides the insight into a unique X-ray diffraction pattern of ZTC: disordered building units comprised...
Nitrogen- and sulfur-doped graphene quantum dots (NS-GQDs) have been synthesized via one-pot pyrolysis approach using citric acid and l-Cysteine as precursors. The obtained NS-GQDs have a size around 2.8 ± 1.0 nm. The fluorescence quantum yield of NS-GQDs was calculated to be 84 times that of Ru(bpy)3Cl2, which is 9.3-fold higher than that of undoped GQDs. Electrochemiluminescence (ECL) of NS-GQDs...
The high voltage aqueous electrochemical capacitor (EC) is a promising energy storage device because of eco-friendliness and high electrochemical performance with a wide operational voltage and high energy density. However, it typically experiences a stability problem that includes cell aging and capacitance loss. Here, to overcome the stability issue, a thin metal layer of Ni is created on one side...
In this work, a compressible melamine-based carbon/reduced graphene oxide foam was synthesized using a simple one-step process. The nitrogen-rich melamine allows the final composite material to be rich in nitrogen, resulting in a higher conductivity and performance. The synergistic combination of nitrogen-doped carbon foam and reduced graphene oxide results in a compressible, free-standing, binder-free...
The unique properties of carbon nanotubes (CNTs) allow them to be used in various optical applications, such as ultra-dark surfaces, bolometers, metamaterial cloaks, and anisotropic absorbers. In particular, organization of CNTs with controlled density at the sub-micrometer scale could enable new strategies to engineer optically active surfaces. Here, we present a new strategy to engineer the density-dependent...
Geometry-controllable three-dimensional reduced graphene oxide (rGO) network layers on carbon nanotube (CNT)-Fe3O4 films are assembled by electrophoresis. The fabricated microstructure consists of an interconnected network of graphene and carbon nanotubes with magnetic Fe3O4 particles as the fast transport channel of charge carriers for high electrical conductivity. Building upon this unique network...
The development of flexible, efficient, and earth-abundant electrocatalysts on carbon substrates for oxygen evolution reaction (OER) is of great significance for flexible power sources. Herein, NiSe nanowire arrays are controllably grown on carbon fibers (CFs) by a simple solvothermal process. The NiSe/CFs catalyst was characterized with electron microscopy, X-ray photoelectron spectroscopy, and X-ray...
While high-quality defect-free epitaxial graphene can be efficiently grown on metal substrates, strong interaction with the supporting metal quenches its outstanding properties. Thus, protocols to transfer graphene to insulating substrates are obligatory, and these often severely impair graphene properties by the introduction of structural or chemical defects. Here we describe a simple and easily...
We investigated a rapid thermal annealing process for the preparation of carbon nanotube based electrocatalysts. The non-nitrogen doped defective carbon catalysts generated using the rapid thermal annealing (RTA) process performed for 32 s until 900 °C showed the best oxygen reduction reaction (ORR) activity in 0.1 M HClO4 with onset potential reaching as high as 0.77 V vs. RHE. The RTA process was...
How graphene oxide (GO) derivatives might affect the cell cycle has been rarely studied. Herein, a GO derivative was fabricated by functionalization of GO with polyethylene glycol (PEG) and polyethylenimine (PEI), and its cytotoxic mechanism was investigated in-depth. It was found that our obtained GO-PEG-PEI nanosheets, not the cytotoxic coating polymer PEI, could induce defect in S phase of the...
Polyacrylonitrile-derived electrospun carbon nanofiber fabrics (ECNFs) are believed to have great potentials in many aspects. However, the un-optimized/limited strength and flexibility considerably hinder their practical applications. We find that the tensile strength, Young's modulus, and flexibility of the ECNFs can be significantly improved by the simple addition of coal-based graphene quantum...
Arc-discharge of graphite is the most prevalent technique for synthesis of novel fullerenes, but the extreme conditions of the carbon arc prevent any currently available instrument from detecting the reaction species inside. To detour the difficulties for probing the derivatization mechanism in the drastic arc-discharge conditions, C78Cl6(C5Cl6) with prototypical C2v(2)-C78 cage has been isolated...
Carbons were elaborated from purely lignocellulosic precursors (Microfibrillated cellulose and Lignosulfonates blends, simplified as MFC/LS blends) by slow pyrolysis (0.2 °C/min) in a large temperature range (400–1200 °C). They were characterized in terms of morphology (scanning electron microscopy), chemical functionalities (infrared spectroscopy), microstructure (Raman spectroscopy and X-ray diffraction)...
We report the experimental realization of η6-complexes of group 6 transition metals with a single layer graphene using photo-activated reactions with organometallic compounds. The reaction progress was followed by in-situ measurements of the graphene conductivity. We observed that the chromium reagents exert the strongest effect on the electronic properties of graphene, leading to (η6-graphene)CrL...
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