Phd thesis carbon nanotube antenna pdf

Carbon nanotubes have received considerable attention since their discovery due to their. Applications and performance of a nanoreceiver with a carbon. In our science paper carbon nanotube transistors scaled to a 40nanometer footprint, we scaled an entire cnt transistor to the international technology roadmap for semiconductors itrs goal of transistors reaching a 40nm footprint a goal they set and havent changed since 2015. All theses and dissertations from 2010 to the present are also available to rochester institute of technology faculty, students and staff from proquest. Oct 24, 2017 rice university graduate student amram bengio sets up a nanotube fiber antenna for testing. Capture technology using carbon nanotubes with polyaspartamide surfactant jacob masiala ngoy a thesis submitted to the faculty of engineering and the built environment, university of the witwatersrand, johannesburg, in fulfilment of the requirements for the degree of doctor of philosophy johannesburg, 2016. Chen in this dissertation, a carbon nanotube thinfilm transistor is fabricated on a flexible substrate. The fibers had to be isolated in styrofoam mounts to assure accurate comparisons with each other and with copper. We report on the first antenna enhanced optoelectronic microscopy studies on nanoscale devices. With one hundred times the tensile strength of steel, thermal. Chapter i carbon nanotubes for antenna applications. Yu, quantitative theory of nanowire and nanotube antenna performance, ieee.

The effect of carbon nanotube cnt alignment on the strain sensing capabilities of multiwalled carbon nanotubepolycarbonate mwcntpc composites was investigated. Another reason why nanotubes have generated intense research activities from scientists of various disciplines is they. Carbon nanotubes are one of the most commonly mentioned building blocks of nanotechnology. Effect of cnt alignment on the strain sensing capability.

Scalable carbon nanotube computational and storage circuits immune to metallic and mispositioned carbon nanotubes. Cnt composite material for wideband millimeterwave antenna. Radar cross section, antenna patternsi mutual coupling and antenna. Prasanna kumar sahu department of electrical engineering and dr. Antenna made of carbon nanotubes makes photovoltaic cells. Ogbuka, chidi premie 20 development of solid adsorbent. Optimization of singlewalled carbon nanotube solubility by noncovalent pegylation using experimental design methods. Study proves carbon nanotube fiber antennas are as capable as. Fractal antenna theory uses a modern fractal geometry that is a natural extension of euclidian geometry. Carbon nanotubebased microwave resonant sensor for. Nanotube fiber antennas as capable as copper rice university researchers show their flexible fibers work well but weigh much less. This sensor system consists of a twolayer flame retardant fr4 patch antenna coated with multi walled carbon nanotubes mwcnts and polypyrrolechitosan ppychi for absorbing organic contaminates. Fundamental properties of carbon nanotube antenna are firstly investigated to predict the antenna bundle response.

Cornell university 2004 the experiments presented in this thesis show that carbon nanotube nt electronic structure can be tuned by mechanical stretching and by magnetic fields. Scientists at rice and the national institute of standards and technology have determined that nanotube fibers made at rice can be as good as copper antennas but 20 times lighter. Advanced carbon fiber composite materials for shielding. Carbon, which has a low atomic number, is the sixth element in the periodic table 6. This study is a part of phd thesis of naghmeh hadidi, proposed and approved by the school.

This is due to the potential of the technology to reduce the overall energy penalty associated with the capture process. A carbon nanotube is a onedimensional molecular wire. The sparse application of metal nanoparticles to carbon nanotube sheet material is found to increase the peak realized gain 1 db compared to an untreated carbon nanotube sheet patch antenna. Graphite is made up of layers of carbon atoms arranged in a hexagonal lattice, like chicken wire see.

Properties of carbon nanotube optical antennae springerlink. Advanced carbon fiber composite materials for shielding and antenna applications aidin mehdipour, ph. Index terms antenna, carbon nanotube cnt composites. Eotvos lorand tudomanyegyetem termeszettudomanyi kar. Rather than construct a rectenna with two discrete components that act as either an antenna or diode, the team have used carbon nanotubes that can be both simultaneously. Foundation doctoral fellowship and doctoral thesis completion award in. Contents history of carbon nanotube why carbon nanotube properties cnt synthesizing cnt antenna conclusion 3. Carbon nanotube rectenna directly converts light into. In this paper, we discuss some of the properties of carbon nanotubes as microwave and mmwave antennas. Acarbon nanotube antenna has been supposed as a center fed antenna fig. The polymer improves the interfacial bonding between the nanotubes.

Nanotubes are contacted by source and drain electrodes, and multiple lithographicallypatterned electrostatic gates are aligned to each device. Carbon nanotube antenna in the sub terahertz range by m. Properties of carbon nanotube loop antennas in transmitting and receiving mode. Patterning of coil antennas in swntbased thin film sensors 117. Rice university graduate student amram bengio prepares a sample nanotube fiber antenna for evaluation. First, an embroidered textile patch antenna was fabricated on a polymer substrate. By coupling the emission and excitation to a scanning optical antenna, we are. Nanoscale wireless opical comunication receivers with graphene and carbon nanotube. Graphene, a single sheet of graphite, can be considered as a building block of all these carbon structures. Phd thesis title year experimental investigation and constitutive modeling of expandable tubular material at multi levels of materials and mechanics 2016 multiscale modeling of carbon nanotubebased nanocomposites using computational mechanics approach 2016. The mwcnt, which act as optical antennae due to their favorably small dimensions, are coated in aluminum oxide and. Unlike previous strategies where diamines were used, a novel route to covalently bridge swcnts by organic molecular linkers is proposed. Project will include modeling and simulating a carbon nanotube antenna numerically as well as with commercial em software.

The patch antenna utilised the entire geometry of the transceiver as a radiation mechanism and, as a result, had a much improved gain compared to the compactfolded dipole antenna. The antenna consists of a fibrous rope about 10 micrometers millionths of a meter long and four micrometers thick, containing about 30m carbon nanotubes. Thermal properties and nanoelectromechanical system based on carbon nanotubes thesis by hsinying chiu in partial fulfillment of the requirements for the degree of doctor of philosophy california institute of technology pasadena, california 2009 defended february 17, 2009. Pdf carbon nanotube composites for wideband millimeterwave. The nanotube antenna differs from an ordinary antenna due to to its high kinetic inductance, characteristic impedance, etc. Design and simulation of carbon nanotube antennas for thz imaging. Transistors, phd thesis, university of british columbia, 2006. Multifunctional carbon nanotube antenna gas sensor 773 26. Effect of meshed carbon nanotube thread ground plane and feedline layers on antenna. A simple rectenna element consists of a dipole antenna with an rf diode connected across the dipole elements. Quantitative theory of nanowire and nanotube antenna. The properties of carbon nanotube as optical antennae have been studied. Pdf synthesis of carbon nanotubes and its applications.

Optimization of carbon nanotube supercapacitor electrode by. We also study the performance of a microstrip patch antenna with the ground plane made of rccf composite. As a new member of the carbon family, carbon nanotubes cnts have exhibited great potentials in water treatment applications. Department of electronics and communication engineering national institute of technology rourkela date. In this report, attention is called to this developing, but already quite large, field of study.

A 4by1 textile antenna array was next fabricated and tested see figure 10. Design methodology based on carbon nanotube field effect. The theoretical minimum diameter of a carbon nanotube is around 0. The objective of this thesis is to present an analysis of antennas, which are applicable to wireless sensor networks and, in particular, to the requirements of the speckled computing network consortium. Local gate control in carbon nanotube quantum devices. These fascinating electromechanical and magnetic effects are quantified using. Study proves carbon nanotube fiber antennas are as capable. Keywords optical antenna, carbon nanotube, nanoscale devices, photocurrent, electroluminescence email. The relation of incoming radiation and carbon nanotube antenna. Injection and compression molding techniques were used to fabricate 5 wt% mwcntpc composites. Teaching and research assistantship the ieee turkey ph. Tuning the band structure of carbon nanotubes ethan davis minot, ph. As the entire transceiver was an antenna, an investigation was carried into the amount of power flow through the transceiver with respect to the input power. Multifunctional carbon nanotube antennagas sensor 773 26.

The research presented in this dissertation is only possible due to the assistance. In 2015, researchers at georgia institute of technology fabricated an optical rectenna using arrays of 2 million multiwall carbon nanotubes mwcnt per cm 2 coupled to nanoscale rectifying diodes. Atomistic simulation of nanoelectro mechanical systems. Carbon nanotube based neat fibers macroscopic fibers containing only carbon nanotubes cnts will yield great advances in hightech applications if they can attain a significant portion of the extraordinary mechanical and electrical properties of individual cnts. However, this requires the development of solid adsorbent materials with large selectivity, large. Local gate control in carbon nanotube quantum devices abstract this thesis presents transport measurements of carbon nanotube electronic devices operated in the quantum regime. The carbon nanotube effects are mathematically introduced via a quantum mechanical conductivity. Where e is the electric field, p is the incidence angle, andlis the halflength ofcarbonnanotube antenna. Antenna with tunable band stop, ieee international workshop on antenna technology 79 march, 2011, hong kong 2. Aqueous dispersion of carbon nanotubes for electronic. Limits of applicability the geometry we consider is that of a thinwire, center fed antenna where the wire is made of a single walled metallic carbon nanotube. Composite rightleft handed antennas for wireless lan applications thesis submitted in partial fulfillment of the requirement for the degree of doctor of philosophy in electrical engineering by sheeja k. Mechanical properties of carbon nanotube nanocomposites.

Based on the physical model of a charged carbon nanotube under rf. For reference, todays topoftheline 14nm transistors actually take up about 90nm of chip real. Optoelectronics with carbon nanotubes by megumi kinoshita doctor of philosophy in physics stony brook university 2011 the carbon nanotube is a promising material for future micro and nanoscale electronics because of its unique electronic properties, high carrier mobility and extraordinary capacity for high current density. Cornell university 2008 carbon nanotubes are tiny hollow cylinders, made from a single graphene sheet, that possess many amazing properties. As one of the most highlyconductive composite materials, single wall carbon nanotube swcnt buckypapers are used to build composite antennas.

Nanostructures based on graphene and functionalized carbon. A rectenna is a rectifying antenna a special type of receiving antenna that is used for converting electromagnetic energy into direct current dc electricity. Project goals include accurate simulation of antenna and development of design guidelines and metrics for this new technology. Carbon nanotubebased microwave resonant sensor for organic. We report on the first antennaenhanced optoelectronic microscopy studies on nanoscale devices. I want to thank vittorio privitera, that helped me during my master thesis and. This sensor system consists of a twolayer flame retardant fr4 patch antenna coated with multi walled carbon nanotubes mwcnts and polypyrrolechitosan ppychi for. This thesis describes the design of proximity coupled feed patch antenna as an organic contaminates sensor. Optimization of singlewalled carbon nanotube solubility. Pdf properties of carbon nanotube loop antennas in. I certify that i have read this dissertation and that, in my opinion, it is fully adequate. They are used in wireless power transmission systems that transmit power by radio waves. The rice fibers made only of carbon nanotubes may be practical antennas for aerospace applications and wearable electronics. While there is theory 28 predicting thz emission from.

This paper presents a new formulation based on integral equations system to study the coupled carbon nanotube antennas. Phd thesis title year experimental investigation and constitutive modeling of expandable tubular material at multi levels of materials and mechanics 2016 multiscale modeling of carbon nanotube based nanocomposites using computational mechanics approach 2016. Antennas for wireless sensor network applications enlighten. Doing so will require that the cnts in the fiber are. Carbon nanotube yarn and sheet antennas sciencedirect. Effect of carbon nanotube thread spacing on antenna performance 778. Antennaenhanced optoelectronic probing of carbon nanotubes. The effect of the conductivity tensor of rccf composite on the antenna performance is addressed. Since, the natural frequency is sensitive to the applied external load, one of the principles of sensing is based on the natural frequency shift of a carbon nanotube resonator under an external perturbation. Increasing sensitivity through sample concentration, joshua schumacher. Fractal antenna theory is built, as is the case with conventional antenna theory, on classic electromagnetic theory. In the case of carbon nanotubes, various forms of chemical doping and addition of. Emsimulations of large platforms with and without antennas. The equation of current distribution on a single antenna has been obtained by using conventional transmission line theories.

Design methodology based on carbon nanotube field e. The resonance frequency agrees well with simulation and measurement of its copper counterpart. Rice university graduate student amram bengio sets up a nanotube fiber antenna for testing. Due to the low weight, ease of fabrication, low cost, high stiffness, high thermal and electrical conductivity, advanced carbon fiber composite cfc material is one of the most desirable materials which have been considered recently in the aerospace, electronic, and infrastructure industry. Array of nanotubes to achieve this, the team grew a 10m high vertical array of billions of carbon nanotubes on a silicon substrate via chemical vapour deposition.

Advanced carbon fiber composite materials for shielding and. Next, the antenna was measured on planar and cylindrical surfaces see figure 10. Reconfigurable antenna and rf circuits using multilayer stretchable conductors, riaz ahmed. To browse dissertations and theses by academic department or program, please go to the colleges and departments page. This phd thesis will focus on this slowwave effect and on potential photocurrent generation. Carbon nanotube thin film transistor on flexible substrate and its applications as switches in a phase shifter for a flexible phasedarray antenna daniel thanh khac pham, phd the university of texas at austin, 2010 supervisor. Applications and performance of a nanoreceiver with a carbon nanotube antenna forest c. Functional theory dft fullband calculations and nonequilibrium greens func.

Carbon nanotube transistors, sensors, and beyond xinjian zhou, ph. Abstract in this paper, we have simulated carbon nanotube antennas on cst. In addition, fracture theory elucidates the role swnts play in enhancing. Nanostructures based on graphene and functionalized carbon nanotubes. A carbon nanotube strain sensor for structural health. This thesis examines the use of cfc materials for electromagnetic field shielding and antenna applications. Grafen es szen nanocso alapu nanoszerkezetek eloallitasa es. Meshed carbon nanotube thread patch antenna gas sensor 773. Dec 22, 2004 the likely polarization and antenna properties of carbon nanotubes were recognized from a theoretical standpoint 2 soon after the first experimental synthesis 3,4 of singlewall carbon nanotubes.

Since carbon nanotubes can be grown to centimeter lengths, and since they can be metallic, the properties of carbon nanotubes as antenna. The reradiation lobe pattern of a single antenna and an antenna arrays. The likely polarization and antenna properties of carbon nanotubes were recognized from a theoretical standpoint 2 soon after the first experimental synthesis 3,4 of. Can carbon nanotubes replace copper in wireless antennas. They have novel properties that make them potentially useful in many applications in nanotechnology, electronics, optics and other fields of materials science. Stranos nanotube antenna boosts the number of photons that can be captured and transforms the light into energy that can be funneled into a solar cell.

In particular, carbon nanotubes cnts and graphene nanoribbons. Zhao, integrated antennas for terahertz heb mixers, phd dissertation, february. Oct 23, 2017 nanotube fiber antennas as capable as copper rice university researchers show their flexible fibers work well but weigh much less houston oct. Introduction to carbon nanotubes carbon nanotubes were discovered in 1991 by sumio iijima of nec and are effectively long, thin cylinders of graphite, which you will be familiar with as the material in a pencil or as the basis of some lubricants. Mesoscopic electromagnetic model of carbonnanotube arrays and. Meshed carbon nanotube thread patch antennagas sensor 773. This thesis investigates conduction mechanisms of covalently and non covalently functionalised single wall carbon nanotube swcnt networks. Concordia university, may 2011 due to the low weight, ease of fabrication, low cost, high stiffness, high thermal and electrical conductivity, advanced carbon fiber composite cfc material is one of the. A carbon nanotube polymer material was used to form a piezoresistive strain sensor for structural health monitoring applications. Carbon nanotube composites for wideband millimeterwave. Cnts became a focus of attention of many scientists and companies. Fundamental transmitting properties of carbon nanotube antennas g.

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