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A nano-porous carbon was prepared by carbonization of a novel synthetic resorcinol–formaldehyde (RF) polymer without any additional activation process, and used as electrode materials for aqueous electric double-layer capacitors (EDLCs). This novel RF polymer-based carbon shows high specific surface area with large carbonization yield (∼50%), and excellent specific dc capacitance over 200F/g. The...
Fe 3 O 4 beads, with average diameters of ca. 180nm and narrow size distribution, were self-assembled along multiwalled carbon nanotube (MWCNT) and formed necklace-like nanostructures through a simple, effective and reproducible hydrothermal method. TEM, SEM, XRD and SAED were used to characterize the as-synthesized samples. Results indicate these Fe 3 O 4 beads were...
Uniform submicron hydrogenated amorphous carbon “test tubes”, both empty and containing nickel particles, were synthesized via the self-catalysis-decomposition of Ni(Hdmg) 2 (Hdmg=dimethylglyoxime anion) at 250°C. Since one end of the tubular carbon is always open but the other end is closed, they look like “test tubes”. Transmission electron microscopy images show they have an average inner...
High intensity electron emission cathodes based on carbon nanotube films have been successfully fabricated by use of a screen printing method. The emission properties of the cathode were investigated in single-pulse and double-pulse modes. The high intensity emission from the cathode is obtained and the highest emission current density reaches 267A/cm 2 at an electric field of 15.4V/μm in...
The interaction of single wall carbon nanotubes (SWCNT) and the conducting polymer poly(3,4-ethylendioxythiophene/polystyrenesulfonate) (PEDOT/PSS) was studied by in situ Raman spectroelectrochemistry. The mixing of SWCNT with PEDOT/PSS caused a partial doping of SWCNT which was indicated by the change of relative intensity of the SWCNT Raman features. We have demonstrated for the first time that...
The cytotoxicity of single walled carbon nanotubes was evaluated in the A549 human alveolar carcinoma cell line. Cell viability was assessed using the following indicator dyes, Commassie Blue, Alamar Blue TM , Neutral Red, MTT and WST-1. Exposure of the A549 cells revealed the nanotubes to have low acute toxicity, however considerable variation was found depending on the dye employed. Spectroscopic...
Single-walled carbon nanotubes (SWCNTs) with diameter ranged from 1.22 to 1.6nm filled with C 60 , C 70 and C 60 H 28 molecules (peapods), as well as double-walled carbon nanotubes (DWCNTs) derived from peapods, were studied by HRTEM, UV–vis–NIR and Raman spectroscopy. Suspensions with accurate concentration were used for spectroscopic studies to enable quantitative...
The optical properties of carbon black nanoparticles produced by infrared (pulsed-) laser pyrolysis (IRLP) of gaseous hydrocarbons and their relation with particle morphological and structural variations were studied. Different pulsed-IRLP samples were produced by changing the hydrocarbon precursor from chain-like (acetylene and ethylene) to aromatic (benzene) as well as by modifying the incident...
A simple catalyst-dwindling route without additional templates has been developed, for the first time, to synthesize novel Y-junction hollow carbon nanotrees in a high-yield of 90% by the reaction of ferrocene with 1,2-dichlorobenzene at 180°C. The nanotrees have an average length about 5μm, an average external trunk diameter of about 500nm, branch diameters ranging from 70 to 100nm, and wall thickness...
Carbon nanotubes (CNTs) were synthesized using CH 4 /H 2 plasmas and plasmas simulated using a one-dimensional fluid model. The thinnest and longest CNTs with the highest number density were obtained using CH 4 /H 2 =27/3sccm at 10Torr. These conditions allowed CNTs to grow for 90min without any meaningful loss of catalyst activity. However, an excess H 2 supply...
Composites between graphite and polystyrene have been synthesized starting from potassium intercalated graphite and styrene vapor. This in situ polymerization process can be used to make electrically conductive composites containing well-dispersed thin graphite sheets. The conductivities of the composites increase as the number of ordered carbon layers increases. With only 10% graphite in a polystyrene...
A new model for the geometric structure of carbon nanotubes is described. The existing model of rolled plane graphene sheet ignores discrepancies due to curvature. The new model adopts all bond angles and all bond lengths to be equal in the cylindrical state, and all atoms to be equidistant from a common axis of symmetry, which means that all atoms are truly equal. Exact formulae are presented for...
Reduction of a colloidal suspension of exfoliated graphene oxide sheets in water with hydrazine hydrate results in their aggregation and subsequent formation of a high-surface-area carbon material which consists of thin graphene-based sheets. The reduced material was characterized by elemental analysis, thermo-gravimetric analysis, scanning electron microscopy, X-ray photoelectron spectroscopy, NMR...
A method for the in situ filling of thin-walled carbon nanotubes (CNTs) with long continuous ferromagnetic nanowires is described, using chlorine substituted benzene, C 6 H 6−x Cl x (x=0–3), as the carbon precursor. This method can be used to prepare not only single-metal (e.g. Fe, Co, Ni) nanowires, but also alloy (e.g. FeNi) nanowire-filled CNTs. As an example, we show the...
A phenomenological approach is proposed to derive plasmon energies for C materials as a function of mass density ρ and sp 2 fraction f. It is shown that the energy of the graphite in-plane (π and π+σ) and out-of-plane plasmons, as well as the energy of the diamond bulk (σ) plasmon are correctly reproduced by the model. Crucial factors in this respect – and responsible for the deviation from...
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