Thesis carbon nanotubes
A method for simulating the use of semi-transparent carbon nanotube networks as a charge collector for solar cells in Silvaco ATLAS software is presented in this thesis. Semi-transparent carbon nanotube networks allow for a greater area of charge collection on the surface of solar cells as well as a lower resistance path for charge carriers to travel to the top contact grid lines.
These properties can decrease the required area of a solar cell covered by metal contacts, allowing a greater amount of light input. The metal contacts which transport charge carriers to the edge of the device can also be made thicker and more spread out, lowering the resistance in the metal gridlines of solar cells. The model for semi-transparent carbon nanotube networks presented in this thesis is incorporated into a solar cell which is simulated in Silvaco ATLAS software.
The performance of a cell with and without the carbon nanotube network is compared, taking into account the limitations of the simulation software. Collections 1.
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- Carbon nanotubes as materials in nanotechnology.
Thesis and Dissertation Collection, all items. Show Statistical Information. The increasing demand for more integrated functionality and Multiscale computational modeling of size effects in carbon nanotube-polymer composites. The development of carbon nanotube CNT -polymer composites advocates for a better understanding of their physical and mechanical properties that depend on the diameter of the embedded CNTs. Given that the experimental assessment of size effects is extremely difficult, the use of numerical models can be enormously helpful.
However, since size Water flow in carbon nanotubes: The effect of tube flexibility and thermostat.
Although the importance of temperature control in nonequilibrium molecular dynamics simulations is widely accepted, the consequences of the thermostatting approach in the case of strongly confined fluids are underappreciated. We show the strong influence of the thermostatting method on the water transport in carbon nanotubes CNTs by TIO 2 -modified zeolite-carbon nanotubes composite electrode for photoelectrodegradation of pentachlorophenol from water under uv irradiation. Three types of composite electrode materials, i.
Bachelor theses / Master theses / Diploma theses - Helmholtz-Zentrum Dresden-Rossendorf, HZDR
Thermophoretic transport of ionic liquid droplets in carbon nanotubes. Thermal-gradient induced transport of ionic liquid IL and water droplets through a carbon nanotube CNT is investigated in this study using molecular dynamics simulations. Energetic analysis indicates that IL transport through a CNT is driven primarily by the fluid-solid interaction, while fluid-fluid interactions dominate in water-CNT In green plants, solar-powered electrons are transferred through sophistically arranged photosystems and are subsequently channelled into the Calvin cycle to generate chemical energy.
This paper presents a tuneable binary amplitude Fresnel lens produced by wafer-level microfabrication. The Fresnel lens is fabricated by encapsulating lithographically defined vertically aligned carbon nanotube CNT bundles inside a polydimethyl-siloxane PDMS layer. The composite lens material combines the excellent optical absorption In , a multi-walled carbon nanotube was tested to have a tensile strength of 63gigapascal GPa.
This, for illustration, translates into the ability to endure tension of kg on a cable with cross-section of 1mm2. Since carbon nanotubes have a low density for a solid of 1.
Under excessive tensile strain, the tubes will undergoplastic deformation, which means the deformation is permanent. CNTs are not nearly as strong under compression. Because of their hollow structure and high aspect ratio, they tend to undergobuckingwhen placed under compressive, torsional or bending stress. Multi-walled nanotubes, multiple concentric nanotubes precisely nested within one another, exhibit a striking telescoping property whereby an inner nanotube core may slide, almost without friction, within its outer nanotube shell thus creating an atomically perfect linear or rotational bearing.
This is one of the first true examples ofmolecular nanotechnology, the precise positioning of atoms to create useful machines. Future applications such as a gigahertz mechanical oscillator are also envisaged. Because of the symmetry and unique electronic structure of graphene, the structure of a nanotube strongly affects its electrical properties. The joining of two carbon nanotubes with different electrical properties to form adiodehas been proposed.
Toxicological effects of carbon nanotubes in animals
The strength and flexibility of carbon nanotubes makes them of potential use in controlling other nanoscale structures, which suggests they will have an important role innanotechnologyengineering. The highest tensile strength an individual multi-walled carbon nanotube has been tested to be is 63GPa.
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Carbon nanotubes have many properties—from their unique dimensions to an unusual currentconductonmechanism—that make them ideal components of electrical circuits. For example, they have shown to exhibit strong electron-phonon resonances, which indicate that under certain direct current DC bias and doping conditions their current and the average electron velocity, as well as the electron concentration on the tube oscillate at terahertz frequencies[.
These resonances could potentially be used to make terahertz sources or sensors. Nanotube based tranistorhave been made that operate at room temperature and that are capable of digital switching using a single electron.
One major obstacle to realization of nanotubes has been the lack of technology for mass production. However, in IBM researchers demonstrated how nanotube transistors can be grown in bulk, somewhat like silicon transistors. The IBM process has been developed further and single-chip wafers with over ten billion correctly aligned nanotube junctions have been created. In addition it has been demonstrated that incorrectly aligned nanotubes can be removed automatically using standardphotolithoraphy equipment.
The first nanotube integrated memory circuit was made in One of the main challenges has been regulating the conductivity of nanotubes. Depending on subtle surface features a nanotube may act as a plainconductoror as a semiconductor. A fully automated method has however been developed to remove non-semiconductor tubes.
Another way to make carbon nanotube transistors has been to use random networks of them. By doing so one averages all of their electrical differences and one can produce devices in large scale at the wafer level. This approach was first patented by Nanomix Inc date of original application June It was first published in the academic literature by theusa navel reacherch labority in through independent research work. This approach also enabled Nanomix to make the first transistor on a flexible and transparent substrate. Nanotubes are usually grown on nanoparticles of magnetic metal Fe, Co , which facilitates production of electronic spinotic devices.
In particular control of current through a field-effect transistor by magnetic field has been demonstrated in such a single-tube nanostructure. Large structures of carbon nanotubes can be used for thermal management of electronic circuits. Apaper battery is abatteryengineered to use a paper-thin sheet ofcellulose which is the major constituent of regular paper, among other things infused with alignedcarbon nanotubes. The nanotubes act aselectrods; allowing the storage devices to conduct electricity.
Solar cells developed at the new jerrsyinstitute of technology use a carbon nanotube complex, formed by a mixture of carbon nanotubes and carbonbulkyball to form snake-like structures.