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Catalyst engineering is a key point for selective growth of single-walled carbon nanotubes (SWCNT) with chemical vapor deposition (CVD). Here, we develop a new general synthesis method able to produce a wide range of homogenous bimetallic catalyst nanoparticles with controlled stoichiometry and sizes. The basics of this catalyst synthesis is to use preformed stoichiometric bimetallic Prussian blue...
Recently, a new carbon-based two-dimensional (2D) semiconducting material, so called carbon Ene-yne (CEY), was successfully synthesized. In this work, we examine electronic, optical and thermal properties of this novel material. We studied the stretchability of CEY via density functional theory (DFT) calculations. Using the PBE and HSE06 functionals, as well as the G0W0 method and the Bethe-Salpeter...
A graphitic capping layer was successfully formed on top of Cu interconnects at room temperature, using a pulsed KrF laser. The change in temperature of the Cu line was maintained below 380 °C during laser irradiation with a fluence of 312.5 mJ/cm2. The resistance and critical current density of graphitic layer-capped Cu interconnects were improved by 2.8% and 5.2%, respectively. The lifetime of graphitic...
To optimize the technological development together with energy gain, the crucial materials needs to be tailored in a smart way to benefit a maximum from the property-structure relation. Herein we propose the way to increase a defect density in graphene moving from 1D linear edges to fractal edges, also highlight the fractal nature of graphene structures them-self. The tentative oxidation and hydrogenation...
Interfacial adhesion energy between as-grown graphene and its growth substrate reveals the nature of bonding, as well as provides insights for large-scale roll-to roll graphene transfer. In this study, a novel sample preparation scheme was developed and a unique quasi-static blister test was performed to measure the adhesion energy between as-grown graphene and its copper foil substrate. The copper...
Graphene is an intriguing material in view of its unique Dirac quasi-particles, and the manipulation of its electronic structure is important in material design and applications. Here, we theoretically investigate the electronic band structure of epitaxial graphene on SiC with intercalation of rare earth metal ions (e.g., Yb and Dy) using first-principles calculations. The intercalation can be used...
The functionalization of carbon nanotubes with fluorescent molecules is a standard procedure in many toxicity studies aiming at knowing their distribution within cells or whole organisms. Nevertheless, there is a lack of knowledge concerning the efficiency of the grafting processes, and more specifically concerning the question of the competition between covalent and non-covalent grafting. In this...
Germanium is a promising anode for lithium ion batteries (LIB) because of its potential rate capability and high theoretical specific capacity. Here we demonstrate a seamlessly connected graphene and carbon nanotube (GCNT) hybrid that serves as an integral current collector for a Ge anode. A vertically aligned CNT (VA-CNT) forest grown on graphene provides a high surface area for Ge deposition. The...
A novel heteroleptic iridium complex supported on graphitic carbon nitride was synthesized and used for photoreduction of carbon dioxide under visible light irradiation. The methanol yield obtained after 24 h irradiation was 9934 μmol g−1cat (TON 1241 with respect to Ir) by using triethylamine (TEA) as a sacrificial donor, which was significantly higher as compared to the semiconductor carbon nitride...
A low-cost and sustainable anode material is essential for the future commercialization of sodium-ion batteries (SIBs). Among all proposed anode materials for SIBs, hard carbons are considered to hold the most promise. However, high cost and low carbon yield of precursors limit its industrialization process. Here the synthesis of a biomass-derived hard carbon from leonardite humic acid (LHA) through...
With cost advantages, low-dimensional carbon nanomaterials beyond graphene and carbon nanotube have aroused great interest in diverse fields. To optimize their electrochemical properties for energy storage, it is highly desired to exploit an efficient strategy to engineer their dimensionality and relevant physicochemical parameters. Kevlar was found to be able to serve as a universal precursor to...
Hyperbranched polyurethane (HBPU) structures functionalized with multiple OH groups (HBPU-OH) were synthesized and grafted onto the surface of carbon fibers (CFs) in order to improve interfacial properties between CFs and epoxy resin. Prior to grafting, CFs were electrochemically oxidized with nitric acid electrolyte solution to establish oxygen functional groups required for the grafting reaction...
The poor dispersion of graphene-based materials and the weak interfacial interaction between the nanofillers and polymer matrix greatly limit the reinforcing efficiency of graphene-based nanofillers on polymers. Moreover, the polymers reinforced with graphene usually tend to be brittle. In this paper, hybrid GO/CNT nanostructure was designed and cross-linked through amide bond, which can disperse...
A hybrid Boltzmann transport equation model coupled with a two-temperature model is developed to simulate the heat dissipation in single layer graphene (SLG) suspended or supported on SiO2 and with/without Cu contacts. This hybrid model includes the phonon transport in SLG, electron-phonon interaction (EPI) in SLG, and phonon/electron transmission at the interface between SLG and its surroundings...
Graphene derived from readily available graphite is viewed as the most effective route for large-scale production, due to the low cost of the raw material. However, the difficulty in achieving complete exfoliation, as well as the intrinsic insolubility of graphite, remains a key challenge. Herein, we describe a single-step approach to effectively disrupt and cleave the network of π–π interactions,...
The high surface area and electrical conductivity of few-layered graphene would make it an ideal catalyst support and electrode in fuel cells apart from its susceptibility to oxidative corrosion. Here we report the single-step, bottom-up synthesis of oxidation-resistant boron-doped graphene and show its increased stability in the aggressive electrochemical environment of intermediate temperature solid...
In this work, a plasma treatment is employed to modify the surface properties of g-C3N4 photocatalyst to enhance its photocatalytic performance. A suite of characterization methods are used to investigate the influence of plasma treatment on the surface properties, such as morphology, hydrophilicity and chemical bonding states. The comparative photocatalytic performance of pristine g-C3N4 and the...
In this study, lightweight but stiff carbon monolith with unique laminated inner structure for high electromagnetic interference (EMI) shielding is designed and prepared. The carbon monolith is consisting of carbon honeycomb structure which was filled with a horizontal laminated reduced graphene foam structure that is perpendicular to the cell wall. The stiff carbon honeycomb (CH) structure not only...
The analysis of the radial collapse of individualized and isolated single-wall carbon nanotubes under high pressure as function of their diameter, d, distinguishes their mesoscale and their nanoscale mechanics. The evolution with pressure of the Raman spectra for nine tube chiralities and the theoretical modelling reveal a deviation from the continuum mechanics prediction of a collapse pressure PC∝d−3...
There is growing interest in finding industrial and commercial uses for graphene oxide (GO) because of its unique properties. As with other nanomaterials, increased production and use generally leads to increased environmental exposure. However, very limited information exists on how GO is further functionalized or mineralized in natural aquatic environments, or whether GO can participate in reactions...
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