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 94 for “"Carbon Nanotube (CNT)"”.
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Work functions of functionalized singled-walled carbon nanotubes
Introduction: Carbon nanotube (CNT) structures were discovered by Sumio Iijima in 1991 at NEC laboratories in Japan. Since their discovery, scientists and engineers have been fascinated by their electrical and mechanical properties. Their unique characteristics, in addition to their nanoscale size, …
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Carbon nanotube strain sensors with wide dynamic range fabricated on flexible substrates by novel processing techniques
Carbon nanotube (CNT) strain sensors on flexible polyimide substrates with novel fabrication techniques have been fabricated. Excimer laser photoablation was used for simultaneous patterning of the CNT layer and the polyimide substrate. A transferring technique utilizing sacrificial etching was …
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Synthesis and mechanical characterization of aligned carbon nanotube metal- and carbon-matrix nanocomposites
Carbon nanotube (CNT) assemblies are seeing increasing use in engineering applications due to their advantaged, mass-specific physical properties. The high strength-to-weight ratio, electrical and thermal conductivity, and elastic properties make CNTs ideal for many aerospace, automotive, and …
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Theory of electron transport through single molecules
… gold|molecule|gold structures and the other has carbon nanotube (CNT) electrodes forming CNT|molecule|CNT junctions. The theoretical tools employed are firstly, density functional theory (DFT). Chapter 2 presents an introduction to the theoretical concept of DFT and in this work the implemented …
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Optimizing Powder Metallurgy Methods: Carbon Nanotube Metal Composites
Since their discovery in 1991, CNTs have revolutionized the composites industries and continue to show great promise as exotic reinforcers in a variety of materials. Extensive studies have been carried out by researchers to impart the unique physical properties of CNTs in metal systems and …
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Manufacture of aerospace-grade thermoset and thermoplastic composites via nanoengineered thermal processing
… lighter and stronger, particularly employing carbon fiber reinforced plastics (CFRP) using carbon microfiber reinforcement with thermoset and thermoplastic polymer matrices. With the increasing use of such composites, the need for energy-efficient, cost-effective methods to produce composite …
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Exploring transport and phase behavior in nanoporous carbon materials
… transport and fluid phase transitions inside carbon nanotube (CNT) nanopores (1-2 nm). For substances confined inside slightly larger pore sizes (roughly 4-25 nm in diameter), methods are presented for predicting the diameter-dependent freezing point changes. This work also demonstrates the …
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Hydrogen storage in pt/carbon nanotube sheets
Three types of self-assembled carbon nanotube (CNT) sheets, for example, carboxylic functionalized multi-walled CNTs (MWNTs-COOH), pure multi-walled CNTs (MWNTs), and pure single-walled CNTs (SWNTs), were prepared as substrates by ambient environment vacuum filtration of suspensions of the …
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Predicting the anomalous density of a dense fluid confined within a carbon nanotube
… to describe the energetic landscape near the carbon nanotube (CNT) wall, we obtain analytical results describing the lengthscales associated with the layering observed at the interface of a Lennard-Jones fluid and a CNT. We also show that this approach can be extended to describe the …
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RF energy harvesting using carbon nanotube components
… the feasibility of a RF energy harvester using carbon-nanotube (CNT) transistors. The Cockcroft-Walton (CW) multiplier, a passive voltage multiplier topology, is chosen to turn AC RF energy into a usable DC voltage. This topology is first analyzed by hand in order to develop intuition behind …
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Electrical and optical properties of carbon nanotube intra-connects and conductive polymers
Growth of individual carbon nanotube (CNT) intra-connects (bridges) between two prefabricated electrodes is a great challenge and a pre-requisite to the development of single electron devices. In this thesis, CNT intra-connects were fabricated and studied. Later on, the intra-connects were …
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Static and Dynamic Thermal Behavior of Carbon Based Nanofluids
… engine oil.The first part of this study includes carbon nanotube (CNT)-ethylene glycol (EG) suspension as thermal management fluids. Three types of CNTs with various degrees of crystallinity and surface energy were prepared using heat-treatment temperature. The thermal conductivity of nanofluids …
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SHARC : self-healing analog with RRAM and CNFETs
… new circuits and architectures. For instance, carbon nanotube (CNT) field-effect transistors (CNFETs) for logic and Resistive Random-Access Memory (RRAM) for memory are two promising emerging nanotechnologies for energy-efficient electronics. However, CNFETs suffer from inherent imperfections …
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Design and fabrication of meso-scale flexural testing apparatus for evaluating aligned CNT composite flexures
… is to explore the possibility of using aligned Carbon Nanotube (CNT) based composites in flexures by measuring the kinematics of a composite flexure. The first phase of the research, described in this thesis, is to design, fabricate and assemble a testing apparatus optimized for evaluating …
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Multi-axis compliant mechanism-based nanopositioner for multi-mode mechanical testing of carbon nanotubes
… nanopositioner that addresses a need for carbon nanotube (CNT) instrumentation that is capable of multiple modes of mechanical testing. This nanopositioner is a solution to the need to quantify the mechanical properties of CNTs with the appropriate modes of testing, such as simultaneous …
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Effects of catalyst pretreatment for carbon nanotube growth
The effects of pretreatment of iron catalyst for carbon nanotube (CNT) growth was studied. CNTs were grown on Fe/A1203 (1/10 nm) thin-film catalyst deposited on silicon substrates via exposure to C2H4 in a thermal chemical vapor deposition (CVD) furnace. During CVD, the sample was exposed to a …
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Experimental Characterization of Mode I Fracture Toughness of Reinforced Carbon Fiber Laminate with Nano-Cellulose and CNT Additives
Effective treatment of carbon fiber components to improve delamination resistance is vital to the application of such materials since delamination is one of the biggest concerns regarding the use of composites in the aerospace sector. Due to the significant application benefit gained from increased …
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Carbon nanotube synthesis and detection : limiting the environmental impact of novel technologies
Driven by commercial promise, the carbon nanotube (CNT) industry is growing rapidly, yet little is known about the potential environmental impacts of these novel materials. In particular, there are no methods to detect CNTs in environmental matrices (e.g., sediment) and thus, there is no way to …
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Thermal imaging and analysis of carbon nanotube composites
Carbon nanotube (CNT) films have a broad range of applications, from solar cells and transistors to bolometers and mechanical reinforcement additives for polymers. However, surprisingly little is still known about the thermal properties of such CNT films, and in particular about the intertube …
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Effects of oxygen on the growth characteristics of carbon nanotubes on conductive substrates
The effects of oxygen on Fe-catalyzed carbon nanotube (CNT) growth on Ta substrates was studied. CNTs were grown on Fe thin-film catalysts deposited on silicon substrates via exposure to C₂H₄ in a thermal chemical vapor deposition (CVD) furnace. Heating for CVD growth causes the Fe film to dewet to …
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