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Optical Characterization Of Carbon Nanotubes Using The Displacement Photocurrent Technique
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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.
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.
Book Synopsis Perspective of Carbon Nanotubes by : Hosam El-Din Saleh
Download or read book Perspective of Carbon Nanotubes written by Hosam El-Din Saleh and published by BoD – Books on Demand. This book was released on 2019-12-11 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes belong to new nanomaterials and have been known for almost 20 years, but their history is somewhat lengthier. They have been identified as promising candidates for various applications.High-temperature preparation techniques are conventional techniques for the synthesis of carbon nanotubes using arc discharge or laser ablation, but today these methods are being replaced by low-temperature vapor deposition techniques, since orientation, alignment, nanotube length, diameter, purity, and density of carbon nanotubes can be precisely controlled. The synthesis of carbon nanotubes by chemical vapor deposition on catalyst arrays leads to nanotube models grown from specific sites on surfaces. The controlled synthesis of nanotubes opens up interesting possibilities in nanoscience and nanotechnologies, including electrical, mechanical and electromechanical properties and devices, chemical functionalization, surface chemistry and photochemistry, molecular sensors, and interfacing with moderate biological systems.Carbon nanotubes are used in many applications due to their unique electrical, mechanical, optical, thermal, and other properties. Conductive and high-strength composite materials, energy saving and energy conversion devices, sensors, visualization of field emissions and sources of radiation, means for storing hydrogen, and nanoscale semiconductor devices, probes, and interconnections are some of the many applications of carbon nanotubes.
Book Synopsis Scanning Photocurrent Microscopy Study of Photovoltaic and Thermoelectric Effects in Individual Single-walled Carbon Nanotubes by : Tristan DeBorde
Download or read book Scanning Photocurrent Microscopy Study of Photovoltaic and Thermoelectric Effects in Individual Single-walled Carbon Nanotubes written by Tristan DeBorde and published by . This book was released on 2014 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon Nanotubes are a unique family of nanostructures that have shown remarkable promise for mechanical, electrical, and optical applications. Fundamentally similar to the earlier discovered Buckminsterfullerene (C60), carbon nanotubes are hollow cylinders formed from a single sheet of carbon atoms. The research presented in this dissertation investigates several carbon nanotube properties, with an emphasis on the interactions between light and electrons within the nanotube. Better understanding of these optoelectronic properties is of great interest for future advancement in solar energy conversion. Carbon nanotubes are a quintessential material for researchers studying nanoscience. Small changes in nanotube structure can lead to striking differences in electrical and optical properties. In addition to this rich variety of properties, nanotubes can be concentrically inset within one another resulting in single-walled, double-walled, and multi-walled versions. Single-walled carbon nanotubes are desirable for optoelectronic study as complicated interactions between shells are avoided; which, while an interesting topic, is beyond the scope of this work. In the past, determination of carbon nanotube wall number was achieved via transmission electron microscopy, a technique requiring difficult sample preparation, making it impractical for most working devices. This thesis presents an alternative technique based on the compressibility of nanotube sidewalls as measured by atomic force microscopy. This technique is readily applicable to common device designs and can distinguish single and double-walled carbon nanotubes. This technique has been applied to characterizing the output of our growth process, resulting in recipes that highly favor single-walled growth. The optical properties of single-walled carbon nanotubes have been studied intensely. Each single-walled nanotube has an optical fingerprint based on its unique atomic structure. Specific single-walled nanotube structures can be selected for a wide range of optical applications. Again, however, most techniques previously used to study these optical properties are not easily transferable to common device designs. In this research, the measurement of nanotube fingerprints is achieved by optoelectronic means through the use of a newly constructed scanning photocurrent microscope. This instrument measures changes in electrical transport as the device is locally illuminated by a spectrally-tunable light source, making it a versatile tool for studying nanostructures implemented in a variety device designs. Early work on nanotube optoelectronic properties attributed photocurrent generation to a photovoltaic mechanism. This thesis, however, shows that strong photothermoelectric effects can also be present in nanotube optoelectronic devices. Light absorbed by a nanostructure can locally raise the temperature, resulting in thermoelectric currents. If a carbon nanotube is being employed as the absorbing element of a solar cell, it is possible for thermoelectric currents to reduce or enhance the efficiency of energy conversion. The last portion of this work investigates the nature of optically generated thermoelectric effects in carbon nanotubes. With a better understanding of these thermoelectric effects, future nanostructure solar cell design can efficiently utilize thermoelectric currents.
Book Synopsis Carbon Nanotubes by : Siva Yellampalli
Download or read book Carbon Nanotubes written by Siva Yellampalli and published by BoD – Books on Demand. This book was released on 2011-07-20 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes are one of the most intriguing new materials with extraordinary properties being discovered in the last decade. The unique structure of carbon nanotubes provides nanotubes with extraordinary mechanical and electrical properties. The outstanding properties that these materials possess have opened new interesting researches areas in nanoscience and nanotechnology. Although nanotubes are very promising in a wide variety of fields, application of individual nanotubes for large scale production has been limited. The main roadblocks, which hinder its use, are limited understanding of its synthesis and electrical properties which lead to difficulty in structure control, existence of impurities, and poor processability. This book makes an attempt to provide indepth study and analysis of various synthesis methods, processing techniques and characterization of carbon nanotubes that will lead to the increased applications of carbon nanotubes.
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.
Book Synopsis Carbon nanotubes and graphene for photonic applications by : K. Matsuda
Download or read book Carbon nanotubes and graphene for photonic applications written by K. Matsuda and published by Elsevier Inc. Chapters. This book was released on 2013-08-31 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fundamental electronic states and optical properties of single-walled carbon nanotubes are briefly explained in this chapter. Moreover, the novel optical properties of carbon nanotubes revealed by advanced laser spectroscopy (single-nanotube spectroscopy and time-resolved spectroscopy) are introduced. Due to the enhanced Coulomb interaction, the optically generated electron-hole pair forms a strongly bound ‘exciton’ state, analogous to the hydrogen-like state in the carbon nanotubes. The striking features of excitons in the carbon nanotube, such as singlet-dark states and triplet states, which dominate the optical properties, are described in this chapter.
Book Synopsis Carbon nanotubes and graphene for photonic applications by : B.A. Baker
Download or read book Carbon nanotubes and graphene for photonic applications written by B.A. Baker and published by Elsevier Inc. Chapters. This book was released on 2013-08-31 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes have been explored in light-harvesting and photovoltaic devices because of their unique optoelectronic properties. This chapter provides a brief description of the optoelectronic properties of carbon nanotubes, particularly single-wall carbon nanotubes (SWCNTs), and their implication in various solar cell applications including donor–acceptor solar cells, polymer solar cells, and dye-sensitized solar cells, where carbon nanotubes are utilized as photoactive materials. Carbon-nanotube-based electrodes in photovoltaic devices are also introduced. Carbon-nanotube-based light-harvesting devices are reviewed in terms of fabrication and material processing as well as performance. Finally, advanced emerging methods and the future outlook for carbon-nanotube-based solar cells are discussed.
Book Synopsis Photophysics of Carbon Nanotubes Interfaced with Organic and Inorganic Materials by : Igor A. Levitsky
Download or read book Photophysics of Carbon Nanotubes Interfaced with Organic and Inorganic Materials written by Igor A. Levitsky and published by Springer Science & Business Media. This book was released on 2012-12-22 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photophysics of Carbon Nanotubes Interfaced with Organic and Inorganic Materials describes physical, optical and spectroscopic properties of the emerging class of nanocomposites formed from carbon nanotubes (CNTs) interfacing with organic and inorganic materials. The three main chapters detail novel trends in photophysics related to the interaction of light with various carbon nanotube composites from relatively simple CNT/small molecule assemblies to complex hybrids such as CNT/Si and CNT/DNA nanostructures. The latest experimental results are followed up with detailed discussions and scientific and technological perspectives to provide a through coverage of major topics including: -Light harvesting, energy conversion, photoinduced charge separation and transport in CNT based nanohybrids -CNT/polymer composites exhibiting photoactuation; and -Optical spectroscopy and structure of CNT/DNA complexes. Including original data and a short review of recent research, Photophysics of Carbon Nanotubes Interfaced with Organic and Inorganic Materials makes this emerging field of photophysics and its applications available to academics and professionals working with carbon nanotube composites in fundamental and applied fields
Book Synopsis Carbon nanotube networks and their application in flexible display technology by : Axel Schindler
Download or read book Carbon nanotube networks and their application in flexible display technology written by Axel Schindler and published by Cuvillier Verlag. This book was released on 2019-12-19 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the use of carbon nanotubes in form of randomly oriented networks in display technology. Carbon nanotubes can behave either like a metal or like a semiconductor and are used in this work as transparent conductive pixel electrodes as well as semiconducting channel in thin-film transistors. Monte-Carlo simulations examine more closely the percolation probabilities of metallic and semiconducting nanotubes. The experimental part covers methods to create stable surfactant suspensions from nanotube powders, simple and cost-effective low temperature deposition processes from liquid phase on glass and flexible plastic substrates and patterning procedures of the created films. Electrical and optical characterization gives insight on their performance. The realization of liquid crystal and OLED displays shows the compatibility of transparent carbon nanotube electrodes with production processes. Results of the semiconductor application are presented on a transistor level. The dependence of the transistor performance on the network density for both, mixed and highly semiconducting nanotubes is discussed.
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:
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
Book Synopsis Electrical and Optical Characterization of Carbon Nanotube Diodes by : Argyrios Malapanis
Download or read book Electrical and Optical Characterization of Carbon Nanotube Diodes written by Argyrios Malapanis and published by . This book was released on 2013 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of Optoelectronic Properties of Carbon Nano Materials by : Yunhao Cao
Download or read book A Study of Optoelectronic Properties of Carbon Nano Materials written by Yunhao Cao and published by . This book was released on 2013 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
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:
Book Synopsis Aligned Carbon Nanotubes by : Zhifeng Ren
Download or read book Aligned Carbon Nanotubes written by Zhifeng Ren and published by Springer. This book was released on 2012-09-05 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives a survey of the physics and fabrication of carbon nanotubes and their applications in optics, electronics, chemistry and biotechnology. It focuses on the structural characterization of various carbon nanotubes, fabrication of vertically or parallel aligned carbon nanotubes on substrates or in composites, physical properties for their alignment, and applications of aligned carbon nanotubes in field emission, optical antennas, light transmission, solar cells, chemical devices, bio-devices, and many others. Major fabrication methods are illustrated in detail, particularly the most widely used PECVD growth technique on which various device integration schemes are based, followed by applications such as electrical interconnects, nanodiodes, optical antennas, and nanocoax solar cells, whereas current limitations and challenges are also be discussed to lay the foundation for future developments.
