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The impact of polymer removal by forming gas and vacuum annealing on the doping, strain, and morphology of chemical vapor deposited (CVD) and mechanically exfoliated (ME) graphene is investigated using Raman spectroscopy and atomic force microscopy (AFM). The behavior of graphene exposed and unexposed to polymer is compared. It is found that the well-known doping effect after forming gas annealing...
The interfacial electronic structure of MoO 3−x /graphene has been investigated using photoemission spectroscopy. The experimental data showed that upon deposition of MoO 3−x , the Fermi level of graphene shifts downward gradually from its Dirac point due to the p-type doping effect. From the Fermi level shift of −0.28eV, the hole density of graphene was estimated to be 5...
We have characterized the mechanical behavior of aligned carbon nanotube (CNT) arrays that serve as foam-like energy absorbing materials, by using atomic force microscope indentation. It is shown that the mechanical properties (e.g. elastic modulus, adhesion force, and energy dissipation) of aligned CNT arrays are dependent on the length of CNTs as well as chemical environment that surrounds CNT arrays...
An easy method to synthesize a strongly coupled cobalt ferrite/carbon nanotube (CoFe 2 O 4 /CNT) composite with oxygen bridges between CoFe 2 O 4 and reduced carbon nanotubes (CNTs) by calcining the precursor material was reported. The precursor was prepared by an electrostatic self-assembly of the exfoliated Co(II)Fe(II)Fe(III)-layered double hydroxide (CoFeFe-LDH)...
Selected ultra-high molecular weight polyethylene (UHMWPE) samples extracted from controlled positions along a representative reel from which ski bases are made were analyzed and compared to each other to test their composition and homogeneity. Scanning electron microscopy shows a UHMWPE matrix in which spherical particles are partly agglomerated and homogeneously distributed. Transmission electron...
SiO 2 -matrix composites filled with 2, 5 and 10wt.% multiwalled carbon nanotubes (MWCNTs) were prepared to evaluate the dielectric properties and microwave attenuation performances over the full X-Band (8.2–12.4GHz) at a wide temperature ranging from 100 to 500°C. On the basis of the conductivity induced by the structure of the MWCNT, the transport of migrating and hopping electrons in the...
Graphdiyne is a recently-synthesized carbon allotrope with a framework of sp- and sp 2 -hybridized carbon atoms. From first-principles calculations, we propose a possible transition of graphdiyne to a novel carbon allotrope (h-carbon) whose structure is a superlattice of carbon nanotubes and graphene nanoribbons. The energy barrier of this endothermic transition was estimated to be 4.30kcal/mol...
Carbon nanotube (CNT)/polymer composites with filler loading close to percolation threshold are demonstrated as sensor materials to monitor the thermal aging of insulation components. In order to represent the real aging conditions of the monitored component, the sensor is made of the same polymer material as the one used in the monitored component and placed in close proximity to the component. During...
The lamellar structure of graphite is known for allowing intercalation of numerous chemical species between its graphene planes. Considering the intercalation of the electron donors, some pure metals, several metallic alloys and even electronegative elements associated with electropositive metal lead to binary or ternary graphite intercalation compounds. In all cases, the presence of an alkali metal...
Ozone modification of an expanded graphite/iron/carbon (EG/Fe/C) composite has been studied. Properties of EG/Fe/C composite after its interactions with ozone were examined by analysis of its porous texture (Brunauer–Emmett–Teller theory), morphology (scanning electron microscope) and chemical composition (X-ray Photoelectron Spectroscopy). Carbon fibers, which seem to be the main component of carbon...
Carbons with high surface area and large volume of ultramicropores were synthesized for CO 2 adsorption. First, mesoporous carbons were produced by soft-templating method using triblock copolymer Pluronic F127 as a structure directing agent and formaldehyde and either phloroglucinol or resorcinol as carbon precursors. The resulting carbons were mainly mesoporous with well-developed surface...
The growth of neuroblastoma (N2a) and Schwann cells has been explored on polymer derived carbon substrates of varying micro and nanoscale geometries: resorcinol–formaldehyde (RF) gel derived carbon films and electrospun nanofibrous (∼200nm diameter) mat and SU-8 (a negative photoresist) derived carbon micro-patterns. MTT assay and complementary lactate dehydrogenase (LDH) assay established cytocompatibility...
Bilayer graphene nanoribbons (BGNRs) with a predefined width have been produced directly from bilayer graphene using a transmission electron microscope (TEM) in scanning mode operated at 300kV. The BGNRs have been subsequently imaged in high-resolution TEM mode at 80kV. During imaging, the interaction of the electrons with the sample induces structural transformations in the BGNR, such as closure...
New macro-cellular carbons, called carbon meringues, have been prepared by whipping until stiff an aqueous solution of tannin until liquid foam was obtained, which was next stabilized in an oven and pyrolysed, hence their name. With such cheap, fast and very easy process, flawless, homogeneous carbon foams were obtained in a wider range of density than that of more conventional cellular vitreous carbon...
A carbon nanotube (CNT) array based spray-winding approach for CNT film fabrication was developed by adding a post hot-pressing process, and an epoxy solution was used to fabricate CNT/epoxy composite film. It showed that the hot-pressing process benefited the load transfer within CNT films by reducing the porosity among CNT bundles and was more efficient in improving the tensile properties of few...
In order to investigate the initial stages of the steam-activation process of boron-doped diamond (BDD) electrodes, polycrystalline BDD electrodes with different levels of boron doping (800, 2500 and 5000ppm) and crystal orientation were treated with water vapor at 800°C. A higher degree of etching was observed for BDD electrodes with higher boron content. Based on scanning electron microscopy, Raman...
Hybrid nanocrystals, fullerene-decorated graphene, were incorporated into the epoxy composites, and their electrical and thermal transport was investigated. The hybrid nanocrystals were fabricated through a solution process and the resultant hybrid nanostructure was verified by transmission electron microscopy and X-ray diffraction characterization. After incorporation of fullerene-functionalized...
A composite thin film composed of multiply-alkylated cyclopentane (MAC) and reduced graphene oxide (rGO) is prepared on a silicon substrate. The rGO sheets were covalently assembled onto a silicon surface by mutilayer deposition. Meanwhile, MAC was synthesized as a hydrocarbon lubricant. The chemical composition, structure and morphology of the film were characterized utilizing the measurement tool...
Low-temperature growth of carbon nanotubes (CNTs) has been claimed to provide a route towards chiral-selective growth, enabling a host of applications. In this contribution, we employ reactive molecular dynamics simulations to demonstrate how plasma-based deposition allows such low-temperature growth. We first show how ion bombardment during the growth affects the carbon dissolution and precipitation...
Although perchlorate (ClO4-) has a detrimental effect on human health, there have been only limited solutions for its complete degradation due to its extraordinary chemical stability. Physical adsorption using activated carbons and ion-exchange resins can provide fast, economic methods for perchlorate removal, but energy-efficient and environmentally benign ways for the disposal and regeneration of...
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