Photophysics Of Single Walled Carbon Nanotubes And Their Applications
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| Author | : Amanda Rose Amori |
| Publisher | : |
| Total Pages | : 162 |
| Release | : 2018 |
| Genre | : |
| ISBN | : |
"Single-walled carbon nanotubes (SWCNTs) are quasi-1D graphitic materials whose excited state properties are governed by electrostatically bound electron-hole pairs, called excitons. SWCNTs have garnered much attention recently due to their unique size-dependent optical and electronic properties. As the understanding of SWCNT photophysics continues to grow, there now exists an incredible opportunity for SWCNTs to drive novel breakthroughs in various applications including water oxidation, photovoltaics, field-effect transistors, and electron-conductive/proton permeable membranes, where nanotubes are called upon to act as light-harvesting and/or charge-transfer materials. However, underlying the eventual performance of SWCNTs in these applications is a need for a deep understanding of their photophysics. This dissertation will focus on some of the fundamental properties of SWCNTs and their photophysics, and will address some of the recent work done to understand (i) the mechanism behind population of a quantum mechanically forbidden "dark" state within the SWCNT band structure, known as the K-momentum dark exciton state, and (ii) the formation of charged excitons upon non-covalent doping of SWCNTs. Further, this work will detail two interesting applications of SWCNTs: Using SWCNTs for photoinduced charge transfer and for simultaneous proton/electron transport."--Page xv.
| Author | : Igor A. Levitsky |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 274 |
| Release | : 2012-12-22 |
| Genre | : Technology & Engineering |
| ISBN | : 1447148266 |
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
| Author | : Lisa Joanne Carlson |
| Publisher | : |
| Total Pages | : 384 |
| Release | : 2009 |
| Genre | : |
| ISBN | : |
| Author | : Yan Li |
| Publisher | : Springer |
| Total Pages | : 340 |
| Release | : 2019-05-16 |
| Genre | : Science |
| ISBN | : 3030127001 |
The series Topics in Current Chemistry Collections presents critical reviews from the journal Topics in Current Chemistry organized in topical volumes. The scope of coverage is all areas of chemical science including the interfaces with related disciplines such as biology, medicine and materials science. The goal of each thematic volume is to give the non-specialist reader, whether in academia or industry, a comprehensive insight into an area where new research is emerging which is of interest to a larger scientific audience. Each review within the volume critically surveys one aspect of that topic and places it within the context of the volume as a whole. The most significant developments of the last 5 to 10 years are presented using selected examples to illustrate the principles discussed. The coverage is not intended to be an exhaustive summary of the field or include large quantities of data, but should rather be conceptual, concentrating on the methodological thinking that will allow the non-specialist reader to understand the information presented. Contributions also offer an outlook on potential future developments in the field.
| Author | : Zhentao Hou |
| Publisher | : |
| Total Pages | : 121 |
| Release | : 2018 |
| Genre | : |
| ISBN | : |
"Single-walled carbon nanotubes (SWCNTs) have unique electronic and optical properties due to the one-dimensional confinement, whereby strongly bound electron-hole pairs, i.e. excitons, play a very important role. Well-isolated SWCNTs display stable and robust photoluminescence (PL) in the near infrared (NIR), which depends on the SWCNT diameter and chirality. Previously, it has been discovered that the PL from DNA-wrapped SWCNTs can be enhanced by up to an order of magnitude upon addition of small molecular reducing agents to the SWCNT suspension. We report studies on the photophysics of isolated SWCNTs upon addition of dithiothreitol (DTT) for various aqueous surfactant-SWCNT suspensions. Similar to DNA-wrapped SWCNTs, sodium dodecyl sulfate (SDS) dispersed SWCNTs also display significant PL brightening upon addition of DTT, while the other surfactant-SWCNTs studied show PL quenching to different extents. Ensemble PL QY and PL lifetime measurements suggest that the addition of DTT has substantial effects on both radiative and non-radiative decay processes in SWCNTs. These results are consistent with changes caused by surfactant reorganization around SWCNTs. Additionally, PL imaging performed on individual long SDS-SWCNTs shows a single step, uniform PL brightening along the entire SWCNT, further supporting the hypothesis that surfactant reorganization is responsible for the PL enhancement. We also present studies on the excited-state decay dynamics of K-momentum dark excitons (KDE) in SWCNTs. These excitons have finite center-of-mass momenta, which are optically forbidden, and therefore should have substantially longer lifetimes than the bright S1 exciton. We have determined the PL lifetimes of both KDE and S1 states for chirality-enriched SWCNT samples using time-correlated single photon counting. Indeed, the average PL lifetime of the KDE state is more than three times longer than that of the S1 state. Somewhat unexpectedly, PL from the KDE state displays a biexponential decay for both SWCNT chiralities studied. The long time component most likely represents the PL decay from the KDE state, whereas the origin of the short time component is not fully understood yet and requires further investigation."--Pages ix-x.
| Author | : Hosam El-Din Saleh |
| Publisher | : BoD – Books on Demand |
| Total Pages | : 250 |
| Release | : 2019-12-11 |
| Genre | : Technology & Engineering |
| ISBN | : 1789844010 |
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.
| Author | : Melorina Dolafi Rezaee |
| Publisher | : American Chemical Society |
| Total Pages | : 158 |
| Release | : 2023-08-01 |
| Genre | : Technology & Engineering |
| ISBN | : 0841299412 |
Single-walled carbon nanotubes (SWCNTs) are cylindrical one-dimensional nanomaterials made of single-layered graphene sheets. They possess unique properties because of their specific structure. Due to their distinct electronic structure and impressive thermal, mechanical, and optical properties, SWCNTs have great applications in biomedicine, energy storage, nanomechanical devices, etc. So far, many methods have been developed to synthesize SWCNTs. Despite the great achievements in the synthesis and applications of SWCNTs in the past few decades, many challenges remain. This primer will equip the reader with a foundational understanding of the growth mechanisms of SWCNTs and the advantages and disadvantages of the process and growth conditions of the various techniques. The reader will also learn how to relate the properties and structure of these materials to their specific functionality in the desired application.
| Author | : Trevor Michael Tumiel |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2023 |
| Genre | : |
| ISBN | : |
"Single-walled carbon nanotube (SWCNT) photophysical properties are remarkably sensitive to environmental factors, as all carbon atoms lie on the surface and are readily exposed to various solvents, surfactants and forces. Such environmental sensitivities mean that the simplest sample preparation treatments can lead to complicated, and often unintended, consequences. In this dissertation, photophysical impact of (i) unintentional lattice defects and (ii) heterogeneous surfactant aggregation on SWCNTs will be investigated. The presence of lattice defects, regularly the result of synthesis and sonication methods, plays a significant role in the brightening of the K-momentum dark exciton state, which manifests as a redshifted photoluminescence (PL) feature located roughly 130 meV from the dominant E11 SWCNT emission feature. Time-correlated single photon counting measurements of SWCNT samples at various temperatures and lattice defect densities, in concert with kinetic modeling, reveal PL dynamics dominated by dark state reservoirs that continuously feed bright excitonic activity. Such information supports the investigation of the photoactive states that can cause unintentional spectral congestion in the valuable telecommunication band. While ionic surfactants have long been used to disperse individual SWCNTs in solution for optical studies, heterogeneous surfactant aggregates behave as localized and unavoidable charge impurities. By correlating single molecule PL spectroscopy with atomic force microscopy, the impact of these local electrostatic perturbations on the optical properties of SWCNTs is directly probed. The results reveal bright, redshifted PL emission from sites of surfactant aggregation, indicating charge-induced localized excitonic activity along the lengths of individual SWCNTs. Together, the studies underscore the complex photophysical effects that can be readily accessed by local perturbations imparted by environmental factors, even if unintended."--Pages xiv-xv.
| Author | : J. Pan |
| Publisher | : Elsevier Inc. Chapters |
| Total Pages | : 43 |
| Release | : 2013-08-31 |
| Genre | : Technology & Engineering |
| ISBN | : 0128088273 |
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.
| Author | : Slava V. Rotkin |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 380 |
| Release | : 2005-06-21 |
| Genre | : Science |
| ISBN | : 9783540231103 |
The book describes the state-of-the-art in fundamental, applied and device physics of nanotubes, including fabrication, manipulation and characterization for device applications; optics of nanotubes; transport and electromechanical devices and fundamentals of theory for applications. This information is critical to the field of nanoscience since nanotubes have the potential to become a very significant electronic material for decades to come. The book will benefit all all readers interested in the application of nanotubes, either in their theoretical foundations or in newly developed characterization tools that may enable practical device fabrication.
