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 18 of 18 for “"aligned arrays"”.
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Advanced purification of aligned arrays of single-walled carbon nanotubes
… however, is in creating large-area, perfectly aligned arrays of purely semiconducting SWNTs (s-SWNTs). Here, we present strategies to address this issue. Nanoscale thermocapillary flows and subsequent etching serve as an effective way to remove the metallic impurities in perfectly aligned …
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High Performance Electronics Based on Aligned Arrays of Single Walled Carbon Nanotubes
We have used dense, perfectly aligned arrays of long, perfectly linear SWNTs as an effective thin film semiconductor suitable for integration into transistors and other classes of electronic devices. These types of devices show excellent electric performance with mobilities and scaled …
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Integration of aligned arrays of single-walled carbon nanotubes in electronic devices
Aligned arrays of single-walled carbon nanotubes (SWNTs) are an attractive format for macroelectronics and RF analog electronics with exceptional electrical, mechanical and optical properties. Unlike isolated SWNT, the presence of many SWNTs in the aligned arrays increases the current output and …
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Thin-film single-walled carbon nanotube transistors fabricated using mechanical meniscus aligned arrays
… to have precisely placed, high density, aligned arrays of SWNTs having uniform electronic properties. This thesis demonstrates a post-synthesis, mechanical alignment technique to obtain precisely placed, high density, aligned arrays of SWNTs. By using an aqueous solution containing …
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The road to high performance single walled carbon nanotube thin film transistors: purification, densification, and integration
… intrinsic electrical properties. In particular, aligned arrays of SWNTs grown via chemical vapor deposition (CVD) on quartz enable device uniformity and wafer scale integration with existing commercial semiconductor processing methods. However, major crucial roadblocks continue to hinder the …
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Approaches for alignment and purification of single walled carbon nanotube thin films and their application in device electronics
Thin films that consist of dense horizontally aligned arrays of semiconducting single walled carbon nanotubes (SWNTs) represent one of the most promising materials for low cost, high performance electronic today. Over the years, a great deal of progress has been made towards this goal, however, to …
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Materials Strategies and Devices for Flexible and Stretchable Electronics
… sensing systems and hemispherical detector arrays. Therefore, other qualities besides flexibility, such as foldability (extreme bendability) or stretchability, are required. In this dissertation, a simple approach to high performance, stretchable and foldable integrated circuits was …
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Optimization of purely semiconducting carbon nanotube complementary field effect transistors
… properties of semiconducting SWNTs in horizontal arrays. Here, we present strategies that optimize CNTFETs by using an array-based metallic nanotube removal process with joule heating induced thermocapillary flow in thin organic layers. Detailed experimental studies reveal the selective removal of …
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High-Resolution Electrohydrodynamic Jet Printing Methods for Applications in Electronics and Biotechnology
… Simple devices, such as transistors that use aligned arrays of single walled carbon nanotubes, illustrate its potential applications in electronics. Also, DNA aptamer-based biosensors and DNA-programmed nanoparticle assembly that use spotted arrays of DNA present applications in biotechnology. …
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Electrical and optical studies on carbon nanotube arrays
… electronics, which avoids these issues, is using arrays of SWNTs, where the ensemble average may provide uniformity from device to device, and this new breed of electronic material can be integrated into electronic devices in a scalable fashion. This dissertation describes (1) methods for …
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Biological and biomimetic mineralization via protein nanoribbon scaffolds
… the body and consists of organized bundles of coaligned filamentous apatite crystals, co-aligned amyloid-like amelogenin nanoribbons (Amel NR) are hypothesized to provide the scaffold for amorphous calcium phosphate (ACP) precursor to apatite. From quantitative analysis of ACP nucleation rates on …
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The growth and characterisation of ordered arrays of zinc oxide nanostructures and optical studies of defects in zinc oxide
In this work the growth of c-axis aligned zinc oxide nanorods on non-epitaxially matched substrates is examined. Nanorod arrays were deposited on silicon by seeding and chemical bath deposition (CBD), carbothermal vapour phase transport (CTR-VPT) and a hybrid CBD / CTR-VPT method. The best optical …
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Process variables controlling consistency of carbon nanotube forest growth
Aligned arrays of carbon nanotubes (A-CNTs), called CNT forests, are the precursor for controlled-morphology macroscopic nanocomposites and nanoengineered composites due to theirscale-dependent, tunable physicall properties. Applications include polymer and ceramic matrix nanocomposites (PNCs and …
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Electrical and thermal characterization techniques for carbon nanotube transistors and networks
… single-walled CNT random networks and perfectly aligned arrays. The platform is freely suspended to confine heat flow to one dimension, leading to challenging stress patterns in the constituent SiO2 membrane. Using sputtered SiO2 reduces stress by a factor of 20 and results in a “flatter,” more …
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Nanostructured ferroelectric materials
… nanoscaling can be used to form high density arrays of monodomain ferroelectric nanostructures, which is desirable for the miniaturisation of memory devices. This thesis details the use of various types of nanostructuring approaches to fabricate arrays of ferroelectric nanostructures, …
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Nanostructured architectures for colloidal quantum dot solar cells
… due to poor electronic transport. Vertically aligned arrays of ZnO nanowires can decouple absorption and collection: The nanowires penetrate into the QD film and serve as highly-conductive channels for extracting photogenerated electrons from deep within the film. After optimizing the nanowire …
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Carbon nanotube growth on challenging substrates : applications for carbon-fiber composites
… interest is carbon fiber coated with radially-aligned arrays of carbon nanotubes (CNTs), which can enable through-thickness and interply matrix reinforcement of carbon-fiber-reinforced composites while simultaneously providing additional multifunctional benefits such as electrical and thermal …
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Nanoelectronic Devices using Carbon Nanotubes and Graphene Electrodes: Fabrication and Electronic Transport Investigations
… thin film transistors (s-CNT TFTs) using densely aligned arrays of metallic CNTs (m-CNTs) for source/drain electrodes. From the electronic transport measurements at room temperature, significant improvements of field-effect mobility, on-conductance, transconductance and current on/off ratio for …