Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 223 for “"Single-walled"”.
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Gas phase production of single-walled carbon nanotubes
Single-walled carbon nanotubes have been produced in a continuous flow gasphase catalytic growth process, in a heated flow of carbon monoxide at pressures of 1--10 atmospheres and temperatures of 800--1200°C. Catalytic cluster nuclei for the nanotubes are generated in situ by thermal …
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Charging and defects in single-walled carbon nanotubes
Single-Walled Carbon Nanotubes (SWCNTs) have been one of the most intensively studied materials. Because of their single-atomic-layer structure, SWCNTs are extremely sensitive to environmental interactions, in which charge transfer and defect formation are the most notable effects. Among a number …
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Resonance Raman spectroscopy of single-walled carbon nanotubes
… of diameters. The anti-Stokes Raman spectra of single-wall carbon nanotubes (SWNTs) are unique relative to other crystalline systems, especially in exhibiting large asymmetries with regard to their corresponding Stokes spectra. This asymmetry is due to the unique resonant enhancement phenomena …
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Electric field quenching of single-walled carbon nanotube photoluminescence
… of an electric field on the photoluminescence of single-walled carbon nanotubes was investigated. Individual SWNTs embedded in polymeric film were deposited on microscope slides with electrodes. The fluorescence intensity and spectra of single semiconducting SWNTs were acquired. When SWNTs in …
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Controlled multi-step purification of single-walled carbon nanotubes
… and non-nanotube carbon materials from raw single-walled carbon nanotubes produced in the HiPco (high pressure CO) process. In this study, iron nanoparticles, coated by carbon, are exposed and oxidized by multiple step oxidation at increasing temperatures. To avoid catalytic oxidation by …
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Applications of Single-Walled Carbon Nanotubes in Organic Electronics
… in 1985, the discovery of multi- and single-walled carbon nanotubes in the early 1990s, and the isolation of graphene in 2004. Single-walled carbon nanotubes (SWNTs) have the potential to bring next-generation electronic devices to fruition. Such devices could be flexible, conformable, …
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Gas chromatography on self assembled single walled carbon nanotubes
… of this research, the self-assembly of multi-walled carbon nanotubes (MWCNTs) on the inside wall of long stainless steel tubings was studied. The CNTs were deposited by the chemical vapor deposition (CVD) using ethylene as the carbon source and the iron nanostructures in the stainless steel as …
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Single-Walled Carbon Nanotube Arrays for High Frequency Applications
… presents a thorough analysis of semiconducting Single-Walled Carbon Nanotube-based devices, followed by a test structure fabrication and measurements.</p> <p>The analysis starts by developing an individual nanotube model, which is then generalized for many nanotubes and adding the parasitic …
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Single chirality single-walled carbon nanotubes : isolation and application
Single Walled Carbon Nanotubes are of great interest as a semiconducting material with diameters around 1nm and length in the 100s of nm to mm range. The large aspect ratio, near-infrared wavelength bandgap and a high conductivity enable a large number of optical and optoelectronic applications …
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Ultrafast Dynamics of Individual Air-Suspended Single-Walled Carbon Nanotube
… of the electronic and optical properties of single-walled carbon nanotubes (SWCNTs) will no doubt benefit future technological applications. Since the discovery of band gap photoluminescence from isolated semiconducting SWCNTs, significant progresses in studying the optical properties of …
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Higher-Order Assemblies of Flavin-Wrapped, Single-Walled Carbon Nanotubes
… research is the ongoing effort to isolate single chirality nanotubes. In 2008, Ju and Papadimitrakopoulos reported a facile method for the 85% enrichment of the (8,6) chirality nanotube based on the helical self-assembly of flavin mononucleotide (FMN) and its significantly higher affinity …
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Advanced purification of aligned arrays of single-walled carbon nanotubes
… the large variety of semiconducting materials, single walled carbon nanotubes (SWNTs) are extremely attractive due to their outstanding charge transport properties and ultrathin bodies. One of the most daunting challenge, however, is in creating large-area, perfectly aligned arrays of purely …
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Evaluations of single walled carbon nanotubes using resonance Raman spectroscopy
… to evaluate the vibrational properties of single walled carbon nanotubes (SWNTs). In the first study, we report an evaluation of second-order combination and over-tone modes in highly ordered pyrolytic graphite (HOPG), in SWNT bundles, and in isolated SWNTs. We found both dispersive and …
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Single-Walled Carbon Nanotube Response to Neutron and Gamma Irradiation
The unique electronic properties of single-walled carbon nanotubes (SWNTs) have sparked interest for using such nanomaterials in the nuclear industry and within radiation detection devices. To explore the application of SWNTs in the nuclear industry, it was first deemed necessary to study how SWNTs …
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Biomedical studies of single -walled carbon nanotubes using near-infrared fluorescence
… providing a scientific foundation for the use of single-walled carbon nanotubes (SWNTs) in biomedical applications. SWNTs have been found to be a unique class of nanoscale near-infrared (NIR) fluorescence contrast agents that also exhibit novel therapeutic capabilities. In our first study, we …
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Functionalized single-walled carbon nanotubes for composite applications and radiation studies
… be strong, lightweight, and be multifunctional. Single-walled carbon nanotubes (SWNTs) have various properties that fit these criteria as a novel material for space and biomedical applications. To utilize SWNTs for this purpose, new chemical functionalization schemes need to be developed and …
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Optical spectroscopy of single-walled carbon nanotubes in high magnetic fields
Magnetic flux threading a single-walled carbon nanotube (SWNT) is predicted to influence its electronic structure through the Aharonov-Bohm (AB) effect, causing bandgap oscillations and absorption peaks splitting. In order to verify these predictions, near infrared (NIR) photoluminescence (PL) and …
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Mechanical reinforcement of polyacrylamide hydrogels using pristine single-walled carbon nanotubes
… fabricated reinforced PAAm hydrogels using single-walled carbon nanotubes as reinforcing materials. The fusion of SWCNTs and the PAAm matrix successfully generated SWCNTs/PAAm hybrid gels with improved mechanical strength. Moreover, the aqueous dispersion of SWCNTs used for engineering the …
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Adsorption Properties of Single -Walled Carbon Nanotubes for Air Quality Engineering
The adsorption capacities of nanotubes were also determined for pure organic vapors, water vapor and mixtures of organic and water vapor. Adsorption of organic vapors depended mainly on the sample morphology with a maximum uptake equivalent to only ≈50% of the total pore volume of the sample. …
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Temperature effects on the electronic conductivity of single-walled carbon nanotubes
The room-temperature electronic conductivity and temperature dependence of conductivity were measured for samples of carbon nanotubes of three types: pristine; functionalized with a nitrobenzene covalent functionalization, which are expected to display poor electronic conductivity; and …
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