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A simple and efficient approach for coating multiwalled carbon nanotubes (MWCNTs) with size-controllable SnO 2 nanoparticles by chemical vapor deposition has been developed using tin hydride (SnH 4 ) gas as the source of SnO 2 at 550°C. The size and coverage of SnO 2 nanoparticles can be adjusted by simply controlling the deposition time and the flow rate of the SnH...
Because of the unique structural, mechanical, and electrical properties, 1-D (one-dimensional) carbon nanotubes and nanofibers have been studied for possible use in many fields from molecular electronics to biomedical applications for several years. The 1-D carbon nanomaterials are produced presently on large scale. The inhalation of ultrafine nanocarbons can cause inflammatory lung response. The...
Large quantities of CN x /carbon nanotube intramolecular junctions were successfully synthesized on a silicon substrate via the chemical vapor deposition method by pyrolysis of ferrocene and melamine. The nanotubes have two apparently different sections, one made of carbon with an empty hollow cylinder structure, and the other made of carbon nitride with a bamboo-like structure. Three- and...
A low-cost and reliable method to produce MWCNT coatings on large surfaces, with possibility to scale up to larger output, aiming at gas sensor applications is reported. The process was based on ethanol decomposition in the temperature range 700–900°C. Different qualities of carbon were produced depending on the experimental parameters. For the samples deposited on sapphire and using Ni as catalyst...
A simple and efficient route to decorate carbon nanotubes (CNTs) with nanocrystalline RuO 2 has been developed. In this method, RuCl 3 ·3H 2 O was oxidized into RuO 2 by oxygen in supercritical diethyl amine, and the produced RuO 2 deposited on CNTs, resulting in RuO 2 /CNT nanocomposites. The as-prepared composites were structurally and morphologically...
With trace halide as a promoter in an iron sulfide catalyst, relatively perfect structural integrity double-walled carbon nanotubes (DWNTs) have been synthesized in large quantity and high yield by arc discharge method. Scanning electron microscope (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and Raman spectroscopy were used for structural characterization and yield...
A novel synthesis of carbon nanotubes for field-emitter arrays with a uniform field emission current is reported. Microwave plasma chemical vapor deposition and a unique structure of a sandwich catalyst stack are used to grow vertically aligned carbon nanotubes with a high density, uniform length and diameter. After being etched in a H 2 /N 2 -microwave plasma, the overall field emission...
The remarkable properties of carbon nanotubes (CNTs) make them attractive for microelectronic applications, especially for interconnects and nanoscale devices. In this paper, we describe a microelectronics compatible process for growing high-aspect-ratio CNT arrays with application to vertical electrical interconnects. A lift-off process was used to pattern catalyst (Al 2 O 3 /Fe)...
Nanocomposites consisting of precursor-derived Si–C–N ceramics incorporated with carbon nanotubes (CNTs) were successfully prepared by casting of a mixture of CNTs and a liquid precursor polymer followed by cross-linking and thermolysis. The effect of CNTs on the fracture toughness of these nanocomposites was investigated by a thermal loading technique. The results reveal a dependence of the fracture...
The influence of applied electric field (E av ) and emission current (I FE ) on the configuration of conical layers carbon nanotubes (CLNTs) grown by CVD on the edge of Ni foil has been investigated. TEM profile imaging revealed a high concentration of nanotubes near the foil edge surface, whereas on the nanotube layers’ outer surfaces single, non-oriented nanotubes with open ends...
We report a study of the initial stages of growth of aligned multiwalled carbon nanotubes (MWNT) synthesised by catalytic chemical vapour deposition (CCVD) of liquid aerosol obtained from toluene/ferrocene solution. A special experimental procedure has been developed to stop the process after short durations (30s to 2min). Two different pyrolysis temperatures are considered: 800 and 850°C. Both scanning...
Multiwalled carbon nanotubes (MWNTs) were synthesized using a chemical vapor deposition floating feed method in a vertical reactor. Effects of the preparation variables on the average diameter of carbon nanotubes were systematically examined using the fractional factorial design (FFD), path of the steepest ascent, and central composite design (CCD) coupled with the response surface methodology. From...
Continuous deposition of carbon nanotubes under open-air conditions on a moving fused quartz substrate is achieved by pyrolytic laser-induced chemical vapor deposition. A CO 2 laser is used to heat a traversing fused quartz rod covered with bimetallic nanoparticles. Pyrolysis of hydrocarbon precursor gas occurs and subsequently gives rise to rapid growth of a multi-wall carbon nanotube forest...
Four high-aspect-ratio carbon nanomaterials were fabricated by template-directed liquid crystal assembly and covalent capture. By selecting from two different liquid crystal precursors (thermotropic AR mesophase, and lyotropic indanthrone disulfonate) and two different nanochannel template wall materials (alumina and pyrolytic carbon) both the shape of the nanocarbon and the graphene layer arrangement...
Single-walled carbon nanotubes (CNTs) were synthesised at different conditions by a novel aerosol method based on the introduction of pre-formed iron catalyst particles into conditions leading to CNT formation. The results of statistical measurements of individual CNT dimensions based on high-resolution TEM images showed the effects of the residence time and temperature in the reactor. The ratio between...
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