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Reduced graphene oxide covalently decorated with polyaniline was synthesized through a novel three step approach. Graphite oxide synthesized by a modified Hummers method, was first subjected to acylation, followed by a covalent functionalization with phenylene diamine and then it was polymerized along with aniline monomer, hence forming amide linkages between polyaniline and reduced graphene oxide...
We report on a novel, simple and easy method to produce graphene layers using chemically synthesized ZnO–graphene quasi core–shell quantum dots. Initially, graphite powder was partially oxidized by acid treatment of graphite powder, which was then mixed with zinc acetate dihydrate in a dimethyl formamide solution. During this process, graphene sheets were detached from the graphite oxide layers through...
P/N co-doped porous carbons have been synthesized by a simple method through direct carbonization of phosphoric acid doped polyaniline. The textural property and the surface chemistry have been investigated by nitrogen sorption and X-ray photoelectron spectra. P/N co-doped carbons exhibit typical microporous characters with a low surface area and a narrow pore size distribution. Interestingly, the...
The morphology of graphene synthesized via atmospheric pressure chemical vapor deposition (APCVD) process was investigated with respect to the hydrogen introduction in each process step. A pristine monolayer graphene was obtained in the condition where hydrogen was excluded in all the steps. The study of growth mechanism of this hydrogen-excluded APCVD process suggests that hydrogen plays a critical...
We report a simple and versatile technique combining the use of an AC electric field with a liquid shear force to prepare ultrathin aligned CNT films on solid substrates. Multiwalled carbon nanotubes (MWCNTs), which were synthesized by a template method and acid-treated single walled carbon nanotubes (SWCNTs) were dispersed in water and used for the ultrathin film fabrication. A solid substrate was...
Electrothermal materials, which convert electric energy into heat have been known for many years now. They are the heart of plethora of devices surrounding us, but their isotropic structure does not allow for tailoring of operating conditions. The carbon nanotube film heaters developed in house were built for the first time on a counter-intuitive concept to pass electric current against the alignment...
In this study, single-walled carbon nanotubes were combined with graphene oxide nanosheets in aqueous dispersion and then chemically reduced to form the carbon nanotube/graphene (CNT/G) composite as electrodes for capacitive deionization (CDI). The structure of the CNT/G composite was highly porous, with single-walled carbon nanotubes (SWCNTs) sandwiched between graphene sheets that functioned as...
The fabrication of a planar supercapacitor based on cluster-assembled nanostructured carbon (ns-C) thin films deposited by supersonic cluster beam deposition and ionic liquid as electrolyte has been demonstrated. Cluster-assembled carbon has a density of about 0.5g/cm 3 and a highly disordered structure with predominant sp 2 hybridization, high surface roughness and granular nanoscale...
Carbon nanofibers (CNFs) and carbon nanotubes have revolutionized the world of the nanotechnology due to their excellent mechanical, electrical and thermal properties. CNFs are graphitic fibers made of stacks of graphene layers aligned perpendicular, tilted or parallel to the fiber axis, thus resulting in different microstructures. Post-production treatments can be applied to CNFs to improve their...
Intercalated compound of graphite fluoride with n-heptane has been synthesized at room temperature using a multi-stage process including fluorination by a gaseous BrF 3 and a set of intercalant exchange reactions. It was found that composition of the compound is CF 0.40 (C 7 H 16 ) 0.04 and the guest molecules interact with the graphite fluoride layers through...
A series of carbide-derived carbons (CDC) have been prepared starting from TiC and using different chlorine treatment temperatures (500–1200°C). Contrary to N 2 adsorption measurements at −196°C, CO 2 adsorption measurements at room temperature and high pressure (up to 1MPa) together with immersion calorimetry measurements into dichloromethane suggest that the synthesized CDC exhibit...
Carbon nanofibers (CNFs) were incorporated into an epoxy matrix with three weight fractions of 0.1%, 0.5% and 1% which were then reinforced with unidirectional carbon fibers (CFs) to fabricate laminated composites with cross-ply configuration. Thermomechanical analysis and tensile tests of the specimens were carried out to characterize thermal and mechanical properties of CNF/epoxy composites and...
Large-scale production of microstructured carbon by benzene pyrolysis at 900°C has been investigated using a quartz plug flow reactor. It was found that a significant increase in carbon yield was achieved by filling the quartz reactor with porcelain tiles. Contrary to what is normally reported in the literature, both lamellar and spherical carbon, characterized by different morphologies and interlayer...
A simple, low-cost method for fabricating nitrogen-doped graphene (NG) is demonstrated by combining the ultrafast thermal exfoliation and covalent transformation from the melamine (MA)–graphene oxide (GO) mixture. NGs prepared at 300, 600, and 900°C were systematically characterized by X-ray photoelectron spectroscopy (XPS), in which pyridinic-N, pyrrolic-N and graphitic-N are the main nitrogen-doped...
Carbon-bonded carbon fiber composites were produced by a simple pressure filtration technique. This method consists of dispersing carbon fibers and phenolic resin to make a slurry and then pressing the water out through a filter cloth, and finally carbonizing the composites at 1000°C in nitrogen. A homogeneous microstructure without agglomeration and layering was achieved. The compressive strength...
Graphene nanogrids (fabricated by graphene nanoribbons obtained through oxidative unzipping of multi-walled carbon nanotubes) were used as two-dimensional selective templates for accelerated differentiation of human mesenchymal stem cells (hMSCs), isolated from umbilical cord blood, into osteogenic lineage. The biocompatible and hydrophilic graphene nanogrids showed high actin cytoskeleton proliferations...
By tuning substrate temperatures in a thermal deposition process, Au nanostructures with different morphologies, such as polygons, dendrites, irregular islands and dense clusters have been obtained on graphene surface. The surface-enhanced Raman scattering (SERS) of graphene caused by gold decoration is systematically investigated. The enhancement factor of graphene G band and the extent of G band...
We report dielectric and conductivity measurements on a composite of carbon nanotubes and a liquid crystal possessing dual frequency switching characteristics. The conductivity increases by two orders of magnitude with respect to that for the host liquid crystal, and achieves negligible temperature dependence. The frequency dependence of the ac conductivity is explained by the extended pair approximation...
In an investigation of structure–property–processing relationships for SWCNT thin film piezoresistive sensors, the gauge factor of the sensors for a small tensile deformation (less than 2% strain) was found to be close to unity and showed negligible dependence on the film thickness and SWCNT bundle length (L) and diameter (d). However, for a large tensile deformation (20–30% strain), the film thickness...
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