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 92 for “"SWNT"”.
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Supramolecular porphyrin arrays on DNA and SWNT scaffolds
A variety of supramolecular porphyrin arrays on DNA or single walled carbon nanotube scaffolds are presented herein. A novel porphyrin modified nucleoside with multiple degrees of freedom about the linking moiety has been synthesised. Oligonucleotide strands containing the novel ‘flexible’ …
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Characterization of Aligned Carbon Nanotube/Polymer Composites
… this thesis is to efficiently disperse and align SWNTs in two different polymer matrices to obtain an orthotropic composite whose strength, stiffness and electrical properties depend on the orientation of the SWNTs. The SWNTs are successfully dispersed and aligned in a polyimide matrix and a …
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Electronic detection of molecules on the exterior and molecular transport through the interior of single walled carbon nanotubes
Single walled carbon nanotubes (SWNT) are unique materials with high surface to volume ratio and all atoms residing on the surface. Due to their tubular shape both exterior and interior of the SWNT are available for interaction with other molecules. One-dimensional electronic structure of SWNT is …
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Towards a carbon nanotube antibody sensor
… work investigated single-walled carbon nanotube (SWNT)/polymer-protein A complexes for optically reporting antibody concentration via a change in near infrared fluorescent emission after antibody binding. SWNT have potential as biosensors because of extraordinary sensitivity, lack of …
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Electrical and optical studies on carbon nanotube arrays
Single-walled carbon nanotubes (SWNTs) have been studied as a prominent class of high performance electronic materials for next generation electronics. Their geometry dependent electronic structure, ballistic transport and low power dissipation due to quasi one dimensional transport, and their …
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semiconducting carbon nanotube transistors: electron and spin transport properties
Single-walled carbon nanotubes (SWNTs) have attracted great interest both scientifically and technologically due to their long mean free paths and high carrier velocities at room temperature, and possibly very long spin-scattering lengths. This thesis will describe experiments to probe the …
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Wet-spinning of neat single-walled carbon nanotube fiber from 100+% sulfuric acid
Single-Walled Carbon Nanotubes (SWNT) have been found to have excellent solubility in super acids such as 100+% H2SO4, and chlorsulfonic acid. The solutions display liquid crystalline behavior at high concentrations in super acids. Traditional wet-spinning method has been applied to SWNTs to make …
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Photochemical studies of single-walled carbon nanotube ozonides and alpha-azoxy ketones
… of ozone with single-walled carbon nanotubes (SWNT) results in formation of 1,2,3-trioxolanes (SWNTO3). Their formation rate was found to be on the order of subseconds at room temperature for diluted SWNT---1% aqueous SDS suspensions. SWNTO3 decayed to SWNT epoxides (SWNTO) with release of …
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Highly-selective Chemiresistive Sensing and Analysis of Vapors Using Functionalized Nanotubes
… from pristine single-walled nanotubes (SWNT's), for use as the main component of sensory units that was used for this study. The basic chemical structure of these functionalized nanotubes; namely: poly(p-phenol)-co-SWNT [1], poly(p-nitrobenzene)-co-SWNT [2], poly(p-fluorobenzene)-co-SWNT …
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Fundamental and Applied Aspects of Electronics Based on Single -Walled Carbon Nanotube Thin Films
To improve the performances of SWNT thin film transistors (TFTs), we adopted high capacitance gate dielectrics to reduce the device operation voltage from ∼20 V to ∼1 V and, in related work, the hysteresis has been reduced from levels so large that the transistors could be used effectively …
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Biopolymer-mediated analyte detection via photoluminescence modulation of single-walled carbon nanotubes
Single-walled carbon nanotubes (SWNT) have unique photo-physical properties which, through the work in this dissertation, are investigated and harnessed to produce optical sensors with unique capabilities. Early studies of the modulation of SWNT optical properties—both photoluminescence and …
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Parallel Fabrication and Transport Properties of Carbon Nanotube Single Electron Transistors
… solution processed single wall carbon nanotubes (SWNTs) and studied their electron transport properties. The approach is based on the assembly of individual SWNTs via dielectrophoresis (DEP) at the selected position of the circuit and formation of tunnel barriers on SWNT. Two different techniques: …
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DNA-Templated Surface Alignment and Characterization of Carbon Nanotubes.
… to align single-walled carbon nanotubes (SWNTs) on surfaces from a droplet of nanotube suspension under gas flow. Fluid motion studies indicate that alignment is likely due to circulation of SWNTs in the droplet. My work provides a facile method for generating oriented nanotubes for …
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Applications of Single-Walled Carbon Nanotubes in Organic Electronics
… in 2004. Single-walled carbon nanotubes (SWNTs) have the potential to bring next-generation electronic devices to fruition. Such devices could be flexible, conformable, and inexpensive. SWNT-based electronics are promising for chemical and biological sensing applications, for example, …
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Sensitivity, selectivity, and stability of a palladium-loaded single-walled carbon nanotube methane gas sensor
… sensors. Single-walled carbon nanotubes (SWNT) can be used as optical sensors, as SWNTs emit fluorescence upon photoexcitation. The photoluminescent (PL) intensity upon excitation depends on the electronic structure of the SWNT. Here, SWNTs are loaded with palladium (Pd) nanoparticles …
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Scanning tunneling microscopy and spectroscopy of nanometer scale metallic features on silicon surfaces
… semiconducting single-walled carbon nanotubes (SWNTs) can determine the transport performance of SWNT based field effect transistors (FETs). In this thesis, I have used an ultrahigh vacuum (UHV) scanning tunneling microscope (STM) to fabricate nanometer scale metallic features on the …
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Functionalized Single Walled Carbon Nanotube/Polymer Nanocomposite Membranes for Gas Separation and Desalination
… objective of this research was to fabricate thin SWNT nanocomposite membranes for gas separation, which have both high permeability and selectivity. SWNT/polyacrylic nanocomposite membranes were fabricated by orienting the SWNTs by high vacuum filtration. The orientation of SWNTs on top of the …
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Carbon nanotube-based sensors for label-free protein detection
… on fluorescent single-walled carbon nanotubes (SWNT) are a promising alternative to conventional biosensors due to the exceptional photophysical properties of SWNT. Such sensors can enable highly-sensitive, selective, and real-time detection of biological analytes. However, important questions …
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Single-molecule methods for an improved understanding of biophysical interactions: from fundamental biology to applied nanotechnology
… remain unclear. Single-Walled Nanotubes (SWNTs) are allotropes of carbon with a cylindrical nanostructure. Though SWNTs tend to form insoluble aggregates, sonicating SWNTs with DNA forms a DNA-SWNT complex that is soluble in water. Single-stranded DNA (ssDNA) is believed to form a helical …
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