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With a high surface area to volume ratio and good transport properties, hollow carbon spheres are one of the candidate materials for energy storage devices. Furthermore, highly capacitive and conductive hollow carbon spheres obtained through an effective synthesis route are in high demand for future commercialization. In this study, nitrogen-doped hollow carbon is synthesized utilizing microwave irradiation...
The effects of the chemical environment of cement composites on the quality and stability of carbon nanofiber (CNF) aqueous dispersion and changes in relative agglomeration state of CNFs from the aqueous solution to the hydrated cement paste were studied. Several dispersion methods and CNF loadings (0.02–1.0% per mass of cement) were examined. Evidence of secondary agglomeration of formerly dispersed...
Excellent elastic properties and good adhesion of graphene to substrate make graphene a promising candidate for application in various friction and wear protective coatings. In order to investigate the response of graphene edges on lateral forces, we combine atomic force microscopy (AFM) based experiments with large scale molecular dynamics (MD) simulations. Exploring movement of AFM tip across graphene...
Electron paramagnetic resonance (EPR) study of air-physisorbed defective carbon nano-onions evidences in favor of microwave assisted formation of weakly-bound paramagnetic complexes comprising negatively-charged O2− ions and edge carbon atoms carrying π-electronic spins. These complexes being located on the graphene edges are stable at low temperatures but irreversibly dissociate at temperatures above...
We have demonstrated a nonlinear behavior for the bandgap opening of doped graphene by controlling the concentration of B and N co-dopants. X-ray absorption and emission spectra reveal that the bandgap increases from 0 to 0.6 eV as the concentration of BN dopants is increased from 0 to 6%, while the bandgap closes when the doping concentration becomes 56%. This nonlinear behavior of bandgap opening...
We herein present systematic insights into the potential of a wide variety of dimension-structured nanocarbons in visible light-O3 integrated process for metal-free water decontamination. Single-walled carbon nanotube (SWCNT), multi-walled carbon nanotube (MWCNT), reduced graphene oxide (rGO) and fullerene (C60) demonstrated high activities in catalytic ozonation, while graphitic carbon nitride (g-C...
Low-cost synthesis and functionization of graphene is important for its application. Here, graphene and Fe3O4/graphene films were both prepared via a green approach of electrochemical exfoliation of graphite paper in aqueous Fe2(SO4)3. Iron ions in the electrolyte could facilitate graphite exfoliation and reduce hydrogen evolution in water medium as well as in-situ functionization of graphene. Small...
Doping with transition metal elements is an effective method to introduce magnetism in graphene, which could enable future graphene-based spintronic devices. Motivated by the recent experimental observation of a stable single layer iron membrane embedded in graphene perforation, we investigate the electronic and magnetic properties of the Fe-nanostructure-embedded graphene system based on first principles...
Catalyst selection is very crucial for controlled growth of single-walled carbon nanotubes (SWNTs). Here we introduce a well-designed FeTiO solid solution for SWNT growth with a high preference to large chiral angles. The FeTiO catalyst was prepared by combining Ti layer deposition onto premade Fe nanoparticles with subsequent high-temperature air calcination, which favours the formation of a homogeneous...
Water-treated graphite has attracted attention as a possible room-temperature superconductor. In this work, we use density functional theory to calculate the structural and electronic properties of crystal graphite intercalated with cyclic water hexamers. We treat two different stackings of this system. In the first, we consider an AB stacking which is typical of graphite. In the second, we consider...
Prototype electronic devices have been critical to the discovery and demonstration of the unique properties of new materials, including composites based on carbon nanotubes (CNT) and graphene. However, these devices are not typically constructed with durability or biocompatibility in mind, relying on conductive polymeric adhesives, mechanical clamps or crimps, or solders for electrical connections...
Electron beam lithography is a powerful maskless tool to fabricate structures on the nanometer scale. Here, we show that low-keV-electron beams enable a direct patterning of tetrahedral amorphous carbon (ta-C) thin films by inducing a local graphitization without the need for any resist or development process step. Irradiation with 4 keV electrons leads to a local decrease of the ta-C film’s electrical...
Templated mesoporous carbons are reviewed by focusing on their syntheses and applications by classifying with the template used because the resultant mesoporous carbon have their own characteristics in their pore structures depending on the template used. Carbon precursors employed, pore structure control, template performance and characteristics of the resultant carbons are discussed by comparing...
We report the highly efficient synthesis of sub-2-nm diameter single-walled carbon nanotube (SWCNT) forests with homogenous and controllable diameter (1.5–2.8 nm), millimeter-scale height, and extremely high purity. This control was achieved by combining a previously reported sandwich catalyst (Al/Fe/Al) with an atmospheric synthesis process and the water-assisted thermal chemical vapor deposition...
Hydrogenated graphene is an important graphene derivative with semiconductor properties. A novel and convenient approach via defluorination and hydrogenation of fluorographite, not previously used Birch-type reduction, is developed to prepare highly hydrogenated graphene in ethylenediamine at room temperature via wet-chemical reduction of commercially available fluorographite containing electropositive...
Dendrimers capped with amino groups (DEN) are grafted to graphene oxide (GO) nanosheets for subsequent functionalization of GO with gadolinium diethylene triamine pentaacetate (Gd-DTPA) and prostate stem cell antigen (PSCA) monoclonal antibody (mAb). The as-prepared GO-DEN(Gd-DTPA)-mAb exhibits very low cytotoxicity, negligible hemolytic activity, and no perceptible toxic effects in mice. GO-DEN(Gd-DTPA)-mAb...
Integrated graphene films (IGFs) with self-assembled single-layer graphene as a channel and multi-layer graphene as an electrode material were synthesized simultaneously using a one-step process by thermal chemical vapor deposition. The prominent difference in graphene growth rate between Ni and Cu catalytic substrates made enable to synthesize the IGFs with self-assembled single-layer and multi-layer...
In this study, the large-area tailoring of reduced graphene oxide (rGO) with tunable arrays of Pt nanostructures has been demonstrated. We synthesized arrays of catalytic Pt nanoparticles, nanowires, and their combined nanostructures from self-assembled thin films of polystyrene-block-poly(4-vinylpyridine) copolymers and their micelles. Then, rGO was transferred onto these Pt nanostructures, which...
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