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 68 for “"SWCNTs"”.
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Electrical properties of various single-wall carbon nanotube networks
… were used, a novel route to covalently bridge SWCNTs by organic molecular linkers is proposed. The bridging relies on using modified Sonogashira and Ullmann couplings, which have the advantage of using spectroscopic evidence to ascertain the success of the bridging. Platinum-enriched SWCNTs …
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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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Ultrafast Dynamics of Individual Air-Suspended Single-Walled Carbon Nanotube
… 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 SWCNTs have been made (e.g. linear …
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Elastic constants from molecular mechanics simulations of frequencies of free-free single-walled carbon nanotubes and clamped single-layer graphene sheets
… constants of single-walled carbon nanotubes (SWCNTs) and single-layer graphene sheets (SLGSs) are determined by studying their free vibration characteristics using molecular mechanics (MM) simulations with the MM3 potential and finding their equivalent continuum structures (ECSs). The …
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Photochemical Tailoring of Single-Wall Carbon Nanotubes by Photoexcited Sodium Hypochlorite
Single-wall carbon nanotubes (SWCNTs) are intriguing 1D nanomaterials whose unusual electronic properties are of interest for a wide array of applications. More specifically, semiconducting SWCNTs have structure-specific electronic transitions that allow for discrete near-infrared fluorescence …
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Photochemistry of single-walled carbon nanotubes in the aquatic environment, and their extraction from soils
… unfunctionalized single-walled carbon nanotubes (SWCNTs) and carboxylated SWCNTs (CSWCNTs), this process was investigated in this study. ^ Results show that unfunctionalized SWCNTs can undergo indirect photo-transformation through reactions with hydroxyl radicals (produced from hydrogen peroxide), …
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Single Ion Detection in Nanotube Nanofluidics
… (6,5) single-walled carbon nanotubes (SWCNTs) to detect proton diffusion in nanofluidic systems at the single-ion level. I first developed a method to encapsulate SWCNTs between two layers of Parylene-C, a polymer with exceptionally low permeability to water and oxygen. The resulting …
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Carbon Nanotubides: an Alternative for Dispersion, Functionalization and Composites Fabrication
… (or an electrode) to form negative charged SWCNTs surrounded by an alkali metal counter ions. SWCNT polyelectrolytes can spontaneously dissolve in a variety of polar aprotic solvents without assistance of sonication and will readily react with alkyls and aryls halides to functionalize the …
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Embedded Nanosensors for defect identification using flexible, optically transparent, deformation responsive wrinkled Single Walled Carbon Nanotube meshes
… lives. Embedded single walled carbon nanotubes (SWCNTs) with exceptional mechanical, optical, and electrical properties can be utilized in overcoming these barriers. This type of NDT technique can monitor the potential for failure in concrete structures by allowing us to monitor the cracks from …
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Imaging and analysis of natural and manufactured nanoparticles
… fate and behaviour of single-walled CNTs (SWCNTs) was investigated in natural waters using transmission electron microscopy (TEM) and atomic force microscopy (AFM). There was a focus on CNT interactions with natural aquatic colloids along with the impacts of other solution conditions at …
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Mechanical reinforcement of polyacrylamide hydrogels using pristine 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 hybrid gels remained excellent stability after two months. SEM images …
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Functionalization and applications of carbon nanotubes
… we use amine functionalized single-walled CNTs (SWCNTs) to attach receptors for gas sensing applications. We optimize the receptors and test the functionalized SWCNTs in an array sensor with regard to sensitivity, selectivity, stability and reproducibility. In Chapter 5, we demonstrate a highly …
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MHD heat and MASS transfer of jet nanofluids flow on the porous wall with chemical reaction
… ( 2 3 Al O ), and single wall carbon nanotubes (SWCNTs) with water as the base fluid. The similarity transforms represented as the jet flow of the nanofluids with the important influences of different flow physical parameters such as magnetic field parameter, heat source parameter, nanoparticles …
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Gas-phase processes for carbon nanotubes production: catalyst synthesis and CNT reorientation dynamics
… synthesis of single-walled CNTs (SWCNTs) and the gas-phase reorientation dynamics of CNTs, which is a critical step preceding aerogel formation in the FCCVD process. This dissertation develops a novel aerosol synthesis route induced by corona discharge at ambient conditions to …
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Photoelectrochemical and photophysical studies of carbon nanotube and molybdenum disulfide based light harvesting devices
… has investigated single-wall carbon nanotubes (SWCNTs) and molybdenum disulfide (MoS2) nanolayers for their light-harvesting ability in donor-acceptor systems. These materials were studied with three specific goals: (i) introducing innovative light-harvesting designs, (ii) understanding their …
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Understanding and engineering interfacial charge transfer of carbon nanotubes and graphene for energy and sensing applications
… length of a SWCNT or hop from larger band gap SWCNTs to smaller band gap SWCNTs, a process known as exciton energy transfer (EET). We studied their behavior as a function of temperature in SWCNT fibers and showed that at room temperature the rate constant for EET is more than two orders of …
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Low-dimensional carbon allotropes: an electron microscopy investigation
… membranes and single-walled carbon nanotubes (SWCNTs). The experimental investigation was performed using a wide range of transmission electron microscopy (TEM) techniques, from conventional imaging and diffraction, to advanced interferometric methods, like electron holography and Geometric …
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Metallic Ground State of Functionalized Carbon Nanotubes
Single-wall carbon nanotubes (SWCNTs) are a fascinating material because they exhibit many outstanding properties. Due to their unique geometric structure, they are a paradigm for one-dimensional systems. Furthermore, depending on their chirality, they can be either metallic or semiconducting. The …
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Fluorescence Labeling of Surface Species as an Efficient Tool for Detection, Identification and Quantification of Oxygen Containing Functionalities on Carbon Materials
… on single-walled carbon nanotubes (SWCNTs) and multiwalled carbon nanotubes (MWCNTs) provides a solution that is reported in this dissertation. The high selectivity of covalent attachment combined with the sensitivity of the fluorescence measurements, allowed us reliably determine …
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Thermal transport in individual single-wall carbon nanotubes
… suspended single-wall carbon nanotubes (SWCNTs). A microfabricated device consisting of two adjacent suspended membranes, each with a platinum resistance heater and thermometer, was used to directly measure the thermal conductance of three individual SWCNTs. These results show the effects …
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