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Author : Tom Galle
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (134 download)
Download or read book Two-dimensional Colloidal Nanocrystals with Optical Activity in the Near-infrared Region written by Tom Galle and published by . This book was released on 2022* with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Matthew George Panthani
Publisher :
ISBN 13 :
Total Pages : 382 pages
Book Rating : 4.:/5 (838 download)
Download or read book Colloidal Nanocrystals with Near-infrared Optical Properties written by Matthew George Panthani and published by . This book was released on 2011 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: Colloidal nanocrystals with optical properties in the near-infrared (NIR) are of interest for many applications such as photovoltaic (PV) energy conversion, bioimaging, and therapeutics. For PVs and other electronic devices, challenges in using colloidal nanomaterials often deal with the surfaces. Because of the high surface-to-volume ratio of small nanocrystals, surfaces and interfaces play an enhanced role in the properties of nanocrystal films and devices. Organic ligand-capped CuInSe2 (CIS) and Cu(InXGa1-X)Se2 (CIGS) nanocrystals were synthesized and used as the absorber layer in prototype solar cells. By fabricating devices from spray-coated CuInSe nanocrystals under ambient conditions, solar-to-electric power conversion efficiencies as high as 3.1% were achieved. Many treatments of the nanocrystal films were explored. Although some treatments increased the conductivity of the nanocrystal films, the best devices were from untreated CIS films. By modifying the reaction chemistry, quantum-confined CuInSeXS2-X (CISS) nanocrystals were produced. The potential of the CISS nanocrystals for targeted bioimaging was demonstrated via oral delivery to mice and imaging of nanocrystal fluorescence. The size-dependent photoluminescence of Si nanocrystals was measured. Si nanocrystals supported on graphene were characterized by conventional transmission electron microscopy and spherical aberration (Cs)-corrected scanning transmission electron microscopy (STEM). Enhanced imaging contrast and resolution was achieved by using Cs-corrected STEM with a graphene support. In addition, clear imaging of defects and the organic-inorganic interface was enabled by utilizing this technique.
Author : Vladimir Lesnyak
Publisher : Frontiers Media SA
ISBN 13 : 2889632695
Total Pages : 110 pages
Book Rating : 4.8/5 (896 download)
Download or read book Colloidal Semiconductor Nanocrystals: Synthesis, Properties, and Applications written by Vladimir Lesnyak and published by Frontiers Media SA. This book was released on 2020-01-06 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Matthew J. Rozin
Publisher :
ISBN 13 :
Total Pages : 134 pages
Book Rating : 4.:/5 (981 download)
Download or read book Colloidal Nanocrystal Metasurfaces written by Matthew J. Rozin and published by . This book was released on 2017 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metasurfaces are ultrathin, quasi-two-dimensional materials that are engineered to control and manipulate the flow of light, producing properties unattainable with naturally occurring materials. Metasurfaces designed to operate within the visible spectrum are of particular interest for advanced nanoscale light sources and chemical sensing. One promising approach to building optical metasurfaces utilizes plasmonic nanoantenna to funnel freely-propagating visible and near-infrared radiation from the far-field into confined nanoscale volumes using metallic antenna. Localized surface plasmon resonances (LSPR) supported by metallic nanoantenna strongly enhance the incident optical field, providing enhanced far-field coupling as well as enhancement of nonlinear optical processes. However, features significantly smaller than the wavelength of light are required and control over nanoscale morphology can be to achieve. In this thesis, I use bottom-up assembly methods to fabricate colloidal nanocrystal metasurfaces and experimentally demonstrate their capability as a tunable, ultrathin platform for controlling highly enhanced optical fields at the nanoscale. Shaped plasmonic nanocrystals are arranged using bottom-up self-assembly methods to produce metasurfaces operational throughout the visible and near-infrared spectrum. These metasurfaces exhibit extreme in-plane electromagnetic coupling that is strongly dependent on nanocrystal size, shape and spacing, displaying near-ideal electromagnetic absorbance tunable between 500-3,000 nanometers. I investigate their ability to mediate and enhance nonlinear optical processes such as second harmonic generation (SHG) and Raman scattering. By utilizing the double-resonance of metal thin-film coupled nanoantenna, we demonstrate colloidal metasurfaces as efficient sources for nonlinear light generation, achieving SHG enhancement of 104, with efficiencies of 5x10-10. Finally, I investigate colloidal metasurfaces for ultra-sensitive detection and hyperspectral chemical mapping, with uniform and predictable Raman enhancement factors of 106-107.
Author : Luis Liz-Marzán
Publisher : CRC Press
ISBN 13 : 1000021300
Total Pages : 578 pages
Book Rating : 4.0/5 ( download)
Download or read book Colloidal Synthesis of Plasmonic Nanometals written by Luis Liz-Marzán and published by CRC Press. This book was released on 2020-04-23 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt: Noble metal nanoparticles have attracted enormous scientific and technological interest because of their unique optical properties, which are related to surface plasmon resonances. The interest in nanosized metal particles dates back to ancient societies, when metals were used in various forms as decorative elements. From the famous Lycurgus cup, made by the Romans in the 4th century AD, through thousands of stained glasses in churches and cathedrals all over medieval Europe, bright-yellow, green, or red colors have been obtained by a touch of metallic additions during glass blowing. This peculiar interaction of light with nanometals can be widely tuned through the morphology and assembly of nanoparticles, thereby expanding the range of potential applications, from energy and information storage to biomedicine, including novel diagnostic and therapeutic methods. This book compiles recent developments that clearly illustrate the state of the art in this cutting-edge research field. It comprises different review articles written by the teams of Prof. Luis Liz-Marzán, an international leader in chemical nanotechnology who has made seminal contributions to the use of colloid chemistry methods to understand and tailor the growth of metal particles at the nanoscale. Apart from synthesis, the book also describes in detail the plasmonic properties of nanomaterials and illustrates some representative applications. This book will appeal to anyone involved in nanotechnology, nanocrystal growth, nanoplasmonics, and surface-enhanced spectroscopies.
Author : Gerasimos Konstantatos
Publisher : Cambridge University Press
ISBN 13 : 0521198267
Total Pages : 329 pages
Book Rating : 4.5/5 (211 download)
Download or read book Colloidal Quantum Dot Optoelectronics and Photovoltaics written by Gerasimos Konstantatos and published by Cambridge University Press. This book was released on 2013-11-07 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: Captures the most up-to-date research in the field, written in an accessible style by the world's leading experts.
Author : Chris D. Geddes
Publisher : John Wiley & Sons
ISBN 13 : 0470642785
Total Pages : 655 pages
Book Rating : 4.4/5 (76 download)
Download or read book Metal-Enhanced Fluorescence written by Chris D. Geddes and published by John Wiley & Sons. This book was released on 2010-06-22 with total page 655 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discover how metal-enhanced fluorescence is changing traditional concepts of fluorescence This book collects and analyzes all the current trends, opinions, and emerging hot topics in the field of metal-enhanced fluorescence (MEF). Readers learn how this emerging technology enhances the utility of current fluorescence-based approaches. For example, MEF can be used to better detect and track specific molecules that may be present in very low quantities in either clinical samples or biological systems. Author Chris Geddes, a noted pioneer in the field, not only explains the fundamentals of metal-enhanced fluorescence, but also the significance of all the most recent findings and models in the field. Metal-enhanced fluorescence refers to the use of metal colloids and nanoscale metallic particles in fluorescence systems. It offers researchers the opportunity to modify the basic properties of fluorophores in both near- and far-field fluorescence formats. Benefits of metal-enhanced fluorescence compared to traditional fluorescence include: Increased efficiency of fluorescence emission Increased detection sensitivity Protect against fluorophore photobleaching Applicability to almost any molecule, including both intrinsic and extrinsic chromophores Following a discussion of the principles and fundamentals, the author examines the process and applications of metal-enhanced fluorescence. Throughout the book, references lead to the primary literature, facilitating in-depth investigations into particular topics. Guiding readers from the basics to state-of-the-technology applications, this book is recommended for all chemists, physicists, and biomedical engineers working in the field of fluorescence.
Author : John Donegan
Publisher : CRC Press
ISBN 13 : 9814316059
Total Pages : 250 pages
Book Rating : 4.8/5 (143 download)
Download or read book Cadmium Telluride Quantum Dots written by John Donegan and published by CRC Press. This book was released on 2013-12-03 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last two decades, semiconductor quantum dots—small colloidal nanoparticles—have garnered a great deal of scientific interest because of their unique properties. Among nanomaterials, CdTe holds special technological importance as the only known II–VI material that can form conventional p–n junctions. This makes CdTe very important for the development of novel optoelectronic devices such as light-emitting diodes, solar cells, and lasers. Moreover, the demand for water-compatible light emitters and the most common biological buffers give CdTe quantum dots fields a veritable edge in biolabeling and bioimaging. Cadmium Telluride Quantum Dots: Advances and Applications focuses on CdTe quantum dots and addresses their synthesis, assembly, optical properties, and applications in biology and medicine. It makes for a very informative reading for anyone involved in nanotechnology and will also benefit those scientists who are looking for a comprehensive account on the current state of quantum dot–related research.
Author : Ulrich Noumbe Nguetchuissi
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (125 download)
Download or read book 2D Materials, Colloidal Nanocrystals and Mixed Dimensional Heterostructures for Nanoelectronics and Optoelectronics in High Doping Regime written by Ulrich Noumbe Nguetchuissi and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanomaterials and especially two-dimensional (2D) materials and nanocrystals have attracted increasing research interests for nanoelectronics and optoelectronics in recent years. When those nanomaterials are implemented in devices, modulating their carrier densities is essential to adapt their electrical properties and functions, with new physical phenomena expecting to occur at a higher doping level. In my thesis work, I explore a new solid gate technology based on ionic glass crystal (LaF3) to induce high electrostatic doping in 2D materials (MoSe2, MoS2, WSe2...) and nanocrystals (HgTe, PbS...) in (photo)transistor like structures. Finally, using large scale graphene electrodes processing on LaF3, the carrier selective of those electrodes combined with the high capacitance gating of ionic glass, I demonstrate a new architecture graphene-HgTe heterostructure with performances for infared detection.
Author : Alexander L. Efros
Publisher : Springer Science & Business Media
ISBN 13 : 1475736770
Total Pages : 277 pages
Book Rating : 4.4/5 (757 download)
Download or read book Semiconductor Nanocrystals written by Alexander L. Efros and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: A physics book that covers the optical properties of quantum-confined semiconductor nanostructures from both the theoretical and experimental points of view together with technological applications. Topics to be reviewed include quantum confinement effects in semiconductors, optical adsorption and emission properties of group IV, III-V, II-VI semiconductors, deep-etched and self assembled quantum dots, nanoclusters, and laser applications in optoelectronics.
Author :
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (742 download)
Download or read book Two-Dimensional Photonic Crystals for Near IR and Visible Optoelectronics Applications written by and published by . This book was released on 2005 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The focus of this project is to develop a process for constructing two-dimensional (2D) photonic crystals, which will be amenable to commercialization. Our approach has been to utilize nanochannel glass (NCG), which consists of a 2D hexagonal arrays of cylindrical voids that traverse the entire thickness of the glass. A 2D photonic can be realized with NCG if high index materials with good transmission properties can be introduced into the channels. This is the primary mission and focus of this project. In addition, e-beam lithography techniques are also being utilized to construct prototype two-dimensional photonic crystals that operate in the UV to low IR wavelength region of the light spectrum. The primary discoveries of this work have been theoretical modelling of gas flows in nanoscale structures and models for the formation of novel nanoparticles and nanowires in high aspect ratio structures. The findings of this work suggest that novel chemical sensors could be constructed with channel glass where nanoparticles or nanowires with specific properties have been formed within the channels. In terms of the ultimate goal of the project, 2-D photonic crystals based on nanochannel glass, the final conclusion is that nanochannel glass is not an appropriate foundation with which to construct 2D photonic crystals.
Author : Michael Rasch
Publisher :
ISBN 13 :
Total Pages : 768 pages
Book Rating : 4.:/5 (862 download)
Download or read book Assembly of Colloidal Nanocrystals Into Phospholipid Structures and Photothermal Materials written by Michael Rasch and published by . This book was released on 2012 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt: There has been growing interest in developing colloidal metal and semiconductor nanocrystals as biomedical imaging contrast agents and therapeutics, since light excitation can cause the nanocrystals to fluoresce or heat up. Recent advances in synthetic chemistry produced fluorescent 2-4 nm diameter silicon and 1-2 nm diaemeter CuInSSe nanocrystals, as well as 16 nm diameter copper selenide (Cu2−[subscript x]Se) nanocrystals exhibiting strong absorbance of near infrared light suitable for biomedical applications. However, the syntheses yield nanocrystals that are stabilized by an adsorbed layer of hydrocarbons, making the nanocrystals hydrophobic and non-dispersible in aqueous solution. Encapsulating these nanocrystals in amphiphilic polymer micelles enables the nanocrystals to disperse in water. Subsequently, the Si nanocrystals were injected into tissue to demonstrate fluorescence imaging, the photothermal transduction efficiency of copper selenide nanocrystals was characterized in water, and the copper selenide nanocrystals were used enhance the photothermal destruction of cancer cells in vitro. The polymer-encapsulated copper selenide nanocrystals were found to have higher photothermal transduction efficiency than 140 nm diameter Au nanoshells, which have been widely investigated for photothermal therapy. Combining the optical properties of metal and semiconductor nanocrystals with the drug-carrying capability of lipid vesicles has received attention lately since it may create a nanomaterial capable of performing simultaneous drug delivery, optical contrast enhancement, and photo-induced therapy. Hydrophobic, dodecanethiol-coated Au nanocrystals were dispersed in water with phosphatidylcholine lipids and characterized using cryo transmission electron microscopy. 1.8 nm diameter Au nanocrystals completely load the bilayer of unsaturated lipid vesicles when the vesicles contain residual chloroform, and without chloroform the nanocrystals do not incorporate into the vesicle bilayer. 1.8 nm Au nanocrystals dispersed in water with saturated lipids to form lipid-coated nanocrystal agglomerates, which sometimes adhered to vesicles, and the shape of the agglomerates varied from linear nanocrystal chains, to flat sheets, to spherical clusters as the lipid fatty acid length was increased from 12 to 18 carbons. Including squalene formed lipid-stabilized emulsion droplets which were fully loaded with the Au nanocrystals. Results with 4.1 nm Au and 2-3 nm diameter Si nanocrystals were similar, but these nanocrystals could not completely load the bilayers of unsaturated lipids.
Author : Andrey Rogach
Publisher : Springer Science & Business Media
ISBN 13 : 3211752374
Total Pages : 374 pages
Book Rating : 4.2/5 (117 download)
Download or read book Semiconductor Nanocrystal Quantum Dots written by Andrey Rogach and published by Springer Science & Business Media. This book was released on 2008-09-02 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first book to specifically focus on semiconductor nanocrystals, and address their synthesis and assembly, optical properties and spectroscopy, and potential areas of nanocrystal-based devices. The enormous potential of nanoscience to impact on industrial output is now clear. Over the next two decades, much of the science will transfer into new products and processes. One emerging area where this challenge will be very successfully met is the field of semiconductor nanocrystals. Also known as colloidal quantum dots, their unique properties have attracted much attention in the last twenty years.
Author : Yue Chen (Ph. D.)
Publisher :
ISBN 13 :
Total Pages : 130 pages
Book Rating : 4.:/5 (13 download)
Download or read book Syntheses of Biocompatible Luminescent Nanocrystals for Visible and Short-wave Infrared Imaging Applications written by Yue Chen (Ph. D.) and published by . This book was released on 2018 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary focus of this thesis is to synthesize biocompatible luminescent nanocrystals for visible and short-wave infrared (1-2 [mu]m, SWIR) imaging applications. Quantum dots (QDs) have been promising fluorescent probes for biomedical imaging due to their high quantum yield (QY), narrow photoluminescence spectra, and excellent photostability. However, challenges remain to be solved to transfer the as-synthesized hydrophobic QD to aqueous solutions while maintaining the high QY and a compact size. This study involves the design and synthesis of a novel ligand that can be introduced to the established QD synthesis, producing norbornene functionalized QDs that can be readily phase transferred into water via norbornene/tetrazine click chemistry, meanwhile allowing flexible functionalization of the QDs by incorporating a functional group on the hydrophilic chain. This ligand system can be applied to a variety of carboxylic-ligand-stabilized QDs, with emission spectra spanning the visible and the SWIR region. The resulting water-soluble QDs exhibit a high QY, a small hydrodynamic diameter (HD), and excellent colloidal stability and pH stability. Further in vitro cell labeling experiments using azido-functionalized QDs demonstrates their potential for cell targeting applications. As in vivo imaging in the SWIR range has further reduced background noise from tissue scattering compared to traditional visible and near infrared (0.7-1 tm, NIR) imaging, images of higher contrast and better resolution can be readily obtained. The next challenge is to develop SWIR emitters that have high quantum efficiency and minimal toxicity, which is of critical importance in order to promote this technology for clinical applications. Our study found that the emission of luminescent gold nanoclusters can be tuned from the visible to the SWIR region by proper selection of ligands and post ligand modifications. The SWIR-emitting gold nanoclusters have a good QY, a HD that is small enough that they exhibit a rapid renal clearance, and images taken in the SWIR region show better resolution of the blood vessels than in the NIR region.
Author : Kallum M. Koczkur
Publisher : American Chemical Society
ISBN 13 : 0841299013
Total Pages : 164 pages
Book Rating : 4.8/5 (412 download)
Download or read book Metal Nanocrystals written by Kallum M. Koczkur and published by American Chemical Society. This book was released on 2020-07-31 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our society depends heavily on metals. They are ubiquitous construction materials, critical interconnects in integrated circuits, common coinage materials, and more. Excitingly, new uses for metals are emerging with the advent of nanoscience, as metal crystals with nanoscale dimensions can display new and tunable properties. The optical and photothermal properties of metal nanocrystals have led to cancer diagnosis and treatment platforms now in clinical trials, while, at the same time, the ability to tune the surface features of metal nanocrystals is giving rise to designer catalysts that enable more sustainable use of precious resources. These are just two examples of how metal nanocrystals are addressing important social needs.
Author : Oluwatobi Samuel Oluwafemi
Publisher : Woodhead Publishing
ISBN 13 : 0128183047
Total Pages : 282 pages
Book Rating : 4.1/5 (281 download)
Download or read book Ternary Quantum Dots written by Oluwatobi Samuel Oluwafemi and published by Woodhead Publishing. This book was released on 2021-07-02 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ternary Quantum Dots: Synthesis, Properties, and Applications reviews the latest advances in ternary (I-III-VI) chalcopyrite quantum dots (QDs), along with their synthesis, properties and applications. Sections address the fundamental key concepts of ternary quantum dots, progress in synthesis strategies (i.e., organic and aqueous synthesis), and characterization methods (i.e., transmission electron microscopy, dynamic light scattering, etc.). Properties of ternary quantum dots are comprehensively reviewed, including optical, chemical and physical properties. The factors and mechanisms of the cytotoxicity of ternary quantum dot-based nanomaterials are also described. Since ternary chalcopyrite quantum dots are less toxic and more environmentally benign than conventional binary II-VI chalcogenide quantum dots, they are being investigated to replace conventional quantum dots in a range of applications. Thus, this book reviews QDs in various applications, such as solar cells, photocatalytic, sensors and bio-applications. Reviews fundamental concepts of ternary quantum dots and quantum dot-nanocomposites including the most relevant synthesis strategies, key properties, and characterization techniques Delves into the cytotoxicity of quantum dots looking at the factors and mechanisms that influence cytotoxicity including demonstration of cytotoxicity assays for in vitro and in vivo tests Touches on the many applications of ternary quantum dots including biomedical applications, applications in solar cells, sensing applications, and photocatalytic applications
Author : Zhiyong Tang
Publisher : John Wiley & Sons
ISBN 13 : 3527337571
Total Pages : 300 pages
Book Rating : 4.5/5 (273 download)
Download or read book Chiral Nanomaterials written by Zhiyong Tang and published by John Wiley & Sons. This book was released on 2018-03-05 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thorough and up-to-date, this book presents recent developments in this exciting research field. To begin with, the text covers the fabrication of chiral nanomaterials via various synthesis methods, including electron beam lithography, ion beam etching, chemical synthesis and biological DNA directed assembly. This is followed by the relevant theory and reaction mechanisms, with a discussion of the characterization of chiral nanomaterials according to the optical properties of metal nanoparticles, semiconductor nanocrystals, and nanoclusters. The whole is rounded off by a summary of applications in the field of catalysis, sensors, and biomedicine. With its comprehensive yet concise coverage of the whole spectrum of research, this is invaluable reading for senior researchers and entrants to the field of nanoscience and materials science.
