Optical Characterization Of Carbon Nanotube Forests

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Optical Characterization of Carbon Nanotube Forests

Author : Brian D. Wood
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (945 download)

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Book Synopsis Optical Characterization of Carbon Nanotube Forests by : Brian D. Wood

Download or read book Optical Characterization of Carbon Nanotube Forests written by Brian D. Wood and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotube forests are vertically grown tubular formations of graphene. Samples were grown with an injection chemical vapor deposition method on substrates of silicon with various deposited layers and bare fused silica. The morphology of the forest is characterized by the height, density, and presence of defects. Total diffuse reflectance and transmittance measurements were taken in the 2-16 +̧−7m spectral range and correlated to the forest0́9s specific morphology. From these correlations, the conditions necessary to maximize the absorption of the forest were found and exploited to cater sample growth for specific substrates to make ideal absorbers. From the transmittance data, the absorption coefficient is found via Beer-Lambert0́9s Law and also correlated to sample morphology, giving us an indication of the height of the forest needed for ideal absorption. Two models were used to attempt to reproduce the experimental absorption coefficient: an effective medium theory using a Maxwell Garnett approximation and by treating the carbon nanotube forest as an effective cylindrical waveguide with walls of graphite. Each model leads to a set of fitting parameters providing a better physical understanding of the forests. It was found that the effective medium theory gave results loosely corroborated with electron microscopy, but had trouble fitting the experimental data, and the index of refraction it provides does not behave like a unified medium. The waveguide model fits the data well, but it requires more experimental evidence to be more conclusive. The theoretical models need more work, but fabrication of ideal absorbers has been achieved on various substrates providing framework for their usage in radiometry and spectroscopy

Optical Characterization of Carbon Nanotubes Using the Displacement Photocurrent Technique

Author : Aditya D. Mohite
Publisher :
ISBN 13 : 9780549052968
Total Pages : 135 pages
Book Rating : 4.0/5 (529 download)

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Book Synopsis Optical Characterization of Carbon Nanotubes Using the Displacement Photocurrent Technique by : Aditya D. Mohite

Download or read book Optical Characterization of Carbon Nanotubes Using the Displacement Photocurrent Technique written by Aditya D. Mohite and published by . This book was released on 2007 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the optical properties of nano materials is critical in the development of future optoelectronic devices. Along with the existing techniques used for characterization of these novel materials, it is also important to develop new techniques and methods which can provide a deeper insight into the optical and electrical properties.

Carbon nanotubes and graphene for photonic applications

Author : T. Wilkinson
Publisher : Elsevier Inc. Chapters
ISBN 13 : 012808829X
Total Pages : 38 pages
Book Rating : 4.1/5 (28 download)

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Book Synopsis Carbon nanotubes and graphene for photonic applications by : T. Wilkinson

Download or read book Carbon nanotubes and graphene for photonic applications written by T. Wilkinson and published by Elsevier Inc. Chapters. This book was released on 2013-08-31 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: This chapter discusses the background knowledge and provides a literature review of carbon-nanotubes-based metamaterials and other nanophotonic devices we present in the chapter. The materials properties of carbon nanotubes are discussed, along with their possible application in producing metamaterials which display artificial optical properties. A detailed analysis of different types of metamaterials is presented, along with their theory and applications. The utilization of silicon nanopillars for producing photonic crystals and the enhanced reflection effects are discussed. Lastly, the theoretical background and designing of carbon nanotube forests-based Fresnel lenses are presented.

Optical Properties of Carbon Nanotubes

Author : Gugang Chen
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (717 download)

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Book Synopsis Optical Properties of Carbon Nanotubes by : Gugang Chen

Download or read book Optical Properties of Carbon Nanotubes written by Gugang Chen and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Carbon nanotubes and graphene for photonic applications

Author : J. Pan
Publisher : Elsevier Inc. Chapters
ISBN 13 : 0128088273
Total Pages : 43 pages
Book Rating : 4.1/5 (28 download)

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Book Synopsis Carbon nanotubes and graphene for photonic applications by : J. Pan

Download or read book Carbon nanotubes and graphene for photonic applications written by J. Pan and published by Elsevier Inc. Chapters. This book was released on 2013-08-31 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes are exceptionally photostable fluorophores that emit in the near infrared range. Their novel optical properties make them particularly appealing for applications in biosensing. This chapter focuses on the state-of-the-art development of optical biosensors based on single-walled carbon nanotubes (SWCNTs); also, it draws attention to the basic photophysics of SWCNTs, optical-sensing mechanisms, and surface functionalization principles. The concerted efforts from the research community in the past decade have enabled the realization of several SWCNT-based optical biosensors that provide real-time, non-invasive analyte detection. We review the performance of these biosensors with regard to their sensitivity, selectivity and response time, and highlight the prospects and challenges of constructing biosensors for more advanced sensing applications.

The Optical Characterization of 0.4 Nm Single-walled Carbon Nanotubes

Author : Kit Yee Cheng
Publisher :
ISBN 13 :
Total Pages : 184 pages
Book Rating : 4.:/5 (537 download)

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Book Synopsis The Optical Characterization of 0.4 Nm Single-walled Carbon Nanotubes by : Kit Yee Cheng

Download or read book The Optical Characterization of 0.4 Nm Single-walled Carbon Nanotubes written by Kit Yee Cheng and published by . This book was released on 2003 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Optical Characterization of 0.3nm Single-walled Carbon Nanotubes

Author : Yiu Yin Tong
Publisher :
ISBN 13 :
Total Pages : 100 pages
Book Rating : 4.:/5 (175 download)

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Book Synopsis Optical Characterization of 0.3nm Single-walled Carbon Nanotubes by : Yiu Yin Tong

Download or read book Optical Characterization of 0.3nm Single-walled Carbon Nanotubes written by Yiu Yin Tong and published by . This book was released on 2007 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Dispersion of Narrow Diameter Carbon Nanotubes for Optical Characterization

Author : Hemant M. Shah
Publisher :
ISBN 13 :
Total Pages : 122 pages
Book Rating : 4.:/5 (432 download)

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Book Synopsis Dispersion of Narrow Diameter Carbon Nanotubes for Optical Characterization by : Hemant M. Shah

Download or read book Dispersion of Narrow Diameter Carbon Nanotubes for Optical Characterization written by Hemant M. Shah and published by . This book was released on 2008 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical properties of carbon nanotubes have recently attracted considerable amount of attention. Due to there direct band gap material characteristic these and dimension of the order of nano meters they find potential applications in the field of nano photonics. Thus the optical study of carbon nanotubes is important for both fundamental research and for the next generation technical applications. In this thesis single walled carbon nanotubes were dispersed in various encapsulates such as surfactants, polymers, proteins etc to separate them individually and study there optical properties. The individually dispersed single walled carbon nanotubes displayed unique absorbance spectra. The optical absorption spectrum of a particular tube is expected to be dominated by a series of relatively sharp inter-band transitions, at energies associated with the van Hove singularities, the absorbance spectrum obtained on our samples were consistent with this expectation. Our samples also showed sharp photoluminescence peaks mostly from the semiconducting single walled carbon nanotubes. The detailed overlap of the absorbance spectra and photoluminescence spectra lead us to believe that our samples contain mainly individual tubes encapsulated in one of the surfactants or polymers. Thin film transistors (TFT) were made with a mesh of single walled carbon nanotubes as the active channel on top of a silicon/silicon oxide substrate, with silicon acting as a back gate and titanium/gold electrodes were evaporated on top of the nanotube film. Photocurrent properties of these thin films were investigated and they showed a huge change in the photocurrent in the presence and absence of the laser light. Thin films of carbon nanotubes were also deposited on rectangular silicon substrates and the influence of applied strain in the presence of laser light was investigated. These films showed a huge change in resistance on application of mechanical strain. Raman measurements were also performed on these thin films and the obtained radial breathing mode (RBM) data helped resolve the diameter of many single walled carbon nanotubes.

Carbon nanotubes and graphene for photonic applications

Author : E. Gaufrès
Publisher : Elsevier Inc. Chapters
ISBN 13 : 0128088214
Total Pages : 34 pages
Book Rating : 4.1/5 (28 download)

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Book Synopsis Carbon nanotubes and graphene for photonic applications by : E. Gaufrès

Download or read book Carbon nanotubes and graphene for photonic applications written by E. Gaufrès and published by Elsevier Inc. Chapters. This book was released on 2013-08-31 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: This chapter describes how the semiconducting-single-wall nanotube (SWNT) extraction affects their luminescence properties and how such properties can be exploited to fabricate optical sources emitting in near-infrared wavelengths ranging from 1 to 2μm. The main applications of carbon nanotube (CNT) lasers are aimed at optical interconnects and biophotonics. We review recent achievements in obtaining optical gain in thin films doped with CNTs. Techniques for determining optical gain in CNTs are considered with particular focus on the variable strip length (VSL) method and choices to integrate nanotubes in the optical waveguide are discussed.

Nonlinear Optical Properties of Graphene and Carbon Nanotube Composites

Author : Jun Wang
Publisher :
ISBN 13 : 9789533074979
Total Pages : pages
Book Rating : 4.0/5 (749 download)

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Book Synopsis Nonlinear Optical Properties of Graphene and Carbon Nanotube Composites by : Jun Wang

Download or read book Nonlinear Optical Properties of Graphene and Carbon Nanotube Composites written by Jun Wang and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Handbook Of Carbon Nanomaterials (Volumes 9-10)

Author : R Bruce Weisman
Publisher : World Scientific
ISBN 13 : 9813235470
Total Pages : 812 pages
Book Rating : 4.8/5 (132 download)

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Book Synopsis Handbook Of Carbon Nanomaterials (Volumes 9-10) by : R Bruce Weisman

Download or read book Handbook Of Carbon Nanomaterials (Volumes 9-10) written by R Bruce Weisman and published by World Scientific. This book was released on 2019-01-22 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is a tribute to the career of Prof. Mildred Dresselhaus. It focuses on the optical properties and spectroscopy of single-wall carbon nanotubes. It contains chapters on diverse experimental and theoretical aspects of the field, written by internationally recognized experts. The volume serves as an important resource for researchers and students interested in carbon nanotubes.

The Optical Properties of Single-walled Carbon Nanotubes: Separation, Characterization, and Measurement in Suspension

Author : Richard M. Russo
Publisher :
ISBN 13 : 9781109848168
Total Pages : 176 pages
Book Rating : 4.8/5 (481 download)

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Book Synopsis The Optical Properties of Single-walled Carbon Nanotubes: Separation, Characterization, and Measurement in Suspension by : Richard M. Russo

Download or read book The Optical Properties of Single-walled Carbon Nanotubes: Separation, Characterization, and Measurement in Suspension written by Richard M. Russo and published by . This book was released on 2006 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: The one dimensional structure of single-walled carbon nanotubes (SWNTs) gives rise to optical phenomena that differ from bulk materials. This dissertation studies the separation of SWNTs dissolved in aqueous media using surfactant molecules, and the measurement of their intrinsic optical properties including absorption and emission. The SWNTs were separated from the bundled form using mechanical processing techniques such as sonication and centrifugation. A processing study, which isolated the effects of sonication frequency, sonication power, and centrifugation speed, was performed to determine the factors that lead to the best separation. The results of this study suggest that the suspensions are a mixture of individual tubes and small bundles. Prior determinations of intrinsic nanotube properties based on the assumption of isolated nanotubes will have to be revisited. The transient absorption spectrum was measured for the S11 subband region using monochromatic pump excitation at wavelengths corresponding to S22 subband transitions, where the exciting pump fluence was sufficient to create many excitons on a single nanotube. The transient decay kinetics followed a linear dependence that was proportional to 1/ t on a log-log scale with a slope of -0.5, which is consistent with the diffusion limited recombination of excitons in one dimension. This result suggests that the decay of photoexcitations in nanotubes is initially governed by two-body kinetics, which becomes a one-body process only in the long time limit. Our work refutes the one-electron model for the excited state relaxation of nanotubes proposed by others. When the transient decay was studied as a function of the initial exciton population, the diffusion coefficient was found to be a different constant value at each initial population. Local thermalization of the surrounding medium may cause this difference, as thermal relaxation occurs on a time scale that is longer than that of exciton recombination in SWNTs. This work further elucidates the mechanism of excited state relaxation in SWNTs, and advances the understanding of one-dimensional nanostructures.

Deposition and Characterization of Carbon Nanotubes (CNTs) Based Films for Sensing Applications

Author : Amila C. Dissanayake
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.:/5 (94 download)

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Book Synopsis Deposition and Characterization of Carbon Nanotubes (CNTs) Based Films for Sensing Applications by : Amila C. Dissanayake

Download or read book Deposition and Characterization of Carbon Nanotubes (CNTs) Based Films for Sensing Applications written by Amila C. Dissanayake and published by . This book was released on 2015 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: The advent of carbon nanotubes has opened up lot of novel applications because of their unique electrical and mechanical properties. CNTs are well known material for its exceptional electrical, mechanical, optical, thermal and chemical properties. A single-wall nanotube ) can be either semiconducting, metallic or semi-metallic, based on its chirality and diameter. SWNTs can be used in transistor device as active channels due to high electron mobility, electrical interconnects, nano-scale circuits, field-emission displays, light-emitting devices and thermal heat sinks due to low resistivity, high current density and high thermal conductivity. Further, their high Young’s modulus and fracture stress is suitable for various sensing applications such as strain/pressure and use in chemical/biological sensors. This work mainly involves the deposition of CNT-based films following two different methods via a conventional microwave chemical vapor deposition and spinning CNT-composites, and explored the possibility of using CNT-based films in strain gauge applications. Deposited films are characterized and analyzed for their structure, microstructure, composition and electrical properties. Rutherford Backscattering Spectrometry, X-ray Reflectivity, Scanning Electron Microscopy, X-ray Diffraction, X-ray Photoelectron Spectroscopy, Atomic Force Microscopy and electrical impedance measurement techniques are used to characterize the films prepared by both the above mentioned methods. The synthesis/deposition process is improved based on the observed films properties. A carbon nanotube forest grown on the Si substrate with Ni as a catalyst using CVD system shows an amorphous nature due to loss of catalytic activity of Ni nano-islands. XPS and RBS data show Ni nano-particles diffused into the Si substrate and surface layer of Ni particles turns out to nickel silicide. The diffusion of Ni nano-particles and nickel silicide formation occurs due to annealing and longer plasma treatment. Because of annealing and plasma treatment, the phase of Ni changes from amorphous to hexagonal close packed with p63/mmc space group and cubic Fm-3m with plasma treatment time. Further, the role of Ni diffusion into silicon in the catalyzing CNT formation has been investigated and discussed further. Carbon nanotube-polymer nanocomposite films are synthesized using spin coating of a polyurethane and CNTs mixture. This produced porous films with the average pore size of around 10 micrometers. The electrical conductivity of the CNTs-polymer composites increases with the carbon nanotube loading, and composites show frequency independent conductivity as frequency increases. Generally, ac conductivity as a function of signal frequency for the above composites shows conductive behavior. The parallel RC-circuit model reveals that composites without any cross-linkers are uniform and homogenous. The composite with low carbon nanotube content with cross-linkers shows the same trend. But composites with higher carbon nanotube content with cross-linkers shows poor dispersion and agglomeration of carbon nanotubes.

Carbon Nanotubes for Interconnects

Author : Aida Todri-Sanial
Publisher : Springer
ISBN 13 : 3319297465
Total Pages : 340 pages
Book Rating : 4.3/5 (192 download)

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Book Synopsis Carbon Nanotubes for Interconnects by : Aida Todri-Sanial

Download or read book Carbon Nanotubes for Interconnects written by Aida Todri-Sanial and published by Springer. This book was released on 2016-07-09 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a single-source reference on the use of carbon nanotubes (CNTs) as interconnect material for horizontal, on-chip and 3D interconnects. The authors demonstrate the uses of bundles of CNTs, as innovative conducting material to fabricate interconnect through-silicon vias (TSVs), in order to improve the performance, reliability and integration of 3D integrated circuits (ICs). This book will be first to provide a coherent overview of exploiting carbon nanotubes for 3D interconnects covering aspects from processing, modeling, simulation, characterization and applications. Coverage also includes a thorough presentation of the application of CNTs as horizontal on-chip interconnects which can potentially revolutionize the nanoelectronics industry. This book is a must-read for anyone interested in the state-of-the-art on exploiting carbon nanotubes for interconnects for both 2D and 3D integrated circuits.

Optical Properties of C60 and Carbon Nanotubes

Author : James Matthew Holden
Publisher :
ISBN 13 :
Total Pages : 240 pages
Book Rating : 4.:/5 (377 download)

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Book Synopsis Optical Properties of C60 and Carbon Nanotubes by : James Matthew Holden

Download or read book Optical Properties of C60 and Carbon Nanotubes written by James Matthew Holden and published by . This book was released on 1997 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Environmental Effects on Optical Properties of Carbon Nanotubes

Author : David Merchin
Publisher :
ISBN 13 :
Total Pages : 80 pages
Book Rating : 4.:/5 (571 download)

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Book Synopsis Environmental Effects on Optical Properties of Carbon Nanotubes by : David Merchin

Download or read book Environmental Effects on Optical Properties of Carbon Nanotubes written by David Merchin and published by . This book was released on 2004 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Carbon nanotubes and graphene for photonic applications

Author : A. Martinez
Publisher : Elsevier Inc. Chapters
ISBN 13 : 0128088222
Total Pages : 33 pages
Book Rating : 4.1/5 (28 download)

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Book Synopsis Carbon nanotubes and graphene for photonic applications by : A. Martinez

Download or read book Carbon nanotubes and graphene for photonic applications written by A. Martinez and published by Elsevier Inc. Chapters. This book was released on 2013-08-31 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fiber laser technology is attracting a great deal of attention due to its numerous applications in fields as diverse as micromachining, biology and medical sciences or telecommunications and its potential as a substitute for solid-state lasers in industrial and technological applications. Fiber lasers are also exciting from the scientific point of view as they are an excellent platform to further study and understand nonlinear optical phenomena. In this chapter, we review the impact of nano-materials, such as graphene and carbon nanotubes, in advancing fiber laser technology. Both graphene and carbon nanotubes present a highly nonlinear optical response, with a high third order susceptibility and saturable absorption. Here, we discuss how these properties can be used to achieve pulse operation using a technique known as mode-locking and how these two materials compare to other mode-locking mechanisms in terms of their ability to achieve pulse operation, the stability of the mode-locked lasers and their long-term reliability.