Download or read book Synthesis of Transition Metal Containing Polymers and Fabrication of Photonic Devices by Self Assembly Method written by Ka-Yan Kitty Man and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Synthesis of Transition Metal Containing Polymers and Fabrication of Photonic Devices by Self Assembly Method" by Ka-yan, Kitty, Man, 文嘉欣, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3124582 Subjects: Pyridine Ruthenium compounds - Synthesis Transition metal compounds - Synthesis Thin films, Multilayered

Download or read book Synthesis of Transition Metal Containing Polymers and Fabrication of Photonic Devices by Self Assembly Method written by Ka-yan Man (Kitty) and published by . This book was released on 2004 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Polymers with Pendant Transition Metal Complexes for Photovoltaic Applications and Nanofabrications written by Kai-Wing Cheng and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Polymers With Pendant Transition Metal Complexes for Photovoltaic Applications and Nanofabrications" by Kai-wing, Cheng, 鄭啟穎, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled POLYMERS WITH PENDANT TRANSITION METAL COMPLEXES FOR PHOTOVOLTAIC APPLICATIONS AND NANOFABRICATIONS Submitted by Cheng Kai Wing for the degree of Doctor of Philosophy at The University of Hong Kong in March 2008 Polymers with pendent ruthenium or rhenium complexes were synthesized and their applications in photovoltaic devices and nanofabrication were investigated. It was found that the incorporation of the metal complexes modified the optical, electronic, and morphological properties of the polymers. Two conjugated polymers based on poly(phenylenethienylene) and poly(fluorenethienylene) main chains, functionalized with trithiocyanato ruthenium terpyridyl complex at the side chain were synthesized. The polymers were prepared via Suzuki coupling reaction followed by functionalization of the metal-free polymers with the metal complex. The polymers exhibited broad absorption band that covered almost the entire visible region with tails extending to the near-infrared region. The broad absorption was due to the presence of two absorbing units in the polymers ⎯ the conjugated main chain, which absorbed photons of higher energy, and the ruthenium complex, which absorbed photons of lower energy. Using space-charge limited current modelling method, the hole carrier mobilities of the polymers were -4 -5 2 calculated to be in the order of 10 -10 cm /Vs. Photovoltaic devices with simple heterojunction configuration ITO/polymer/C /Al showed power conversion 60 efficiencies up to 0.12 % with short-circuit current densities up to 2.58 mA/cm under 100 mW/cm AM 1.5 simulated solar light illumination. The performance of the devices was mainly limited by the low open-circuit voltages due to the high HOMO levels of the polymers. The plots of external quantum efficiencies as the function of wavelength resembled the absorption spectra of the polymers and revealed that both the conjugated main chain and the ruthenium complex contributed to photocurrent generation in the photovoltaic devices. Three polystyrene-block-poly(4-vinylpyridine)s with different block size ratios were functionalized with rhenium bis(phenylimino)acenaphthene tricarbonyl chloride. The three rhenium-containing copolymers exhibited spherical, cylindrical, and lamellar morphologies respectively, depending on the relative size of the blocks. As revealed by transmission electron microscopy, the spherical, cylindrical, and lamellar domains corresponded to the rhenium-containing poly(4-vinylpyridine) block and had dimensions of about 10-20 nm. It was found that the incorporation of the rhenium complex could lead to a significant change in the morphology of the copolymers due to changes in the volume fraction and the interaction parameter between different blocks. The copolymer morphology in thin films was highly sensitive to the preparation conditions and the surface polarity of the substrate. Owing to its cationic nature, the rhenium-containing poly(4-vinylpyridine) block could serve as the template for nanoparticle deposition by electrostatic self-assembly process. It was demonstrated that anionic cadmium sulfide and gold nanoparticles could selectively anchor on the rhenium-containing poly(4-vinylpyridine) block and the patterns of the deposited nanoparticles were found to be replica of the morphology of the block in the underlying cop

Download or read book Materials Nanoarchitectonics written by Katsuhiko Ariga and published by Elsevier. This book was released on 2023-12-15 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials Nanoarchitectonics: From Integrated Molecular Systems to Advanced Devices provides the latest information on the design and molecular manipulation of self-organized hierarchically structured systems using tailor-made nanoscale materials as structural and functional units. The book is organized into three main sections that focus on molecular design of building blocks and hybrid materials, formation of nanostructures, and applications and devices. Bringing together emerging materials, synthetic aspects, nanostructure strategies, and applications, the book aims to support further progress, by offering different perspectives and a strong interdisciplinary approach to this rapidly growing area of innovation. This is an extremely valuable resource for researchers, advanced students, and scientists in industry, with an interest in nanoarchitectonics, nanostructures, and nanomaterials, or across the areas of nanotechnology, chemistry, surface science, polymer science, electrical engineering, physics, chemical engineering, and materials science. Offers a nanoarchitectonic perspective on emerging fields, such as metal-organic frameworks, porous polymer materials, or biomimetic nanostructures Discusses different approaches to utilizing "soft chemistry" as a source for hierarchically organized materials Offers an interdisciplinary approach to the design and construction of integrated chemical nano systems Discusses novel approaches towards the creation of complex multiscale architectures

Download or read book Two Dimensional Transition Metal Dichalcogenides written by Narayanasamy Sabari Arul and published by Springer. This book was released on 2019-07-30 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents advanced synthesis techniques adopted to fabricate two-dimensional (2D) transition metal dichalcogenides (TMDs) materials with its enhanced properties towards their utilization in various applications such as, energy storage devices, photovoltaics, electrocatalysis, electronic devices, photocatalysts, sensing and biomedical applications. It provides detailed coverage on everything from the synthesis and properties to the applications and future prospects of research in 2D TMD nanomaterials.

Download or read book Novel 2D Transition Metal Dichalcogenide Synthesis Methods for Electronic and Photonic Device Applications written by Omar Abbas and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis of Diazacrown Ether and Transition Metal Containing Polymers by Atom Transfer Radical Polymerization and Other Methods written by 陳淑恆 and published by . This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Synthesis of Diazacrown Ether and Transition Metal Containing Polymers by Atom Transfer Radical Polymerization and Other Methods" by 陳淑恆, Suk-hang, Chan, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3124287 Subjects: Crown ethers Transition metal compound Polyimides

Download or read book Metallo Supramolecular Polymers written by Masayoshi Higuchi and published by Springer Nature. This book was released on 2019-11-12 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the synthesis, electrochemical and photochemical properties, and device applications of metallo-supramolecular polymers, new kinds of polymers synthesized by the complexation of metal ions and organic ditopic ligands. Their electrochemical and photochemical properties are also interesting and much different from conventional organic polymers. The properties come from the electronic intra-chain interaction between the metal ions and the ligands in the polymer chain. In this book, for example, the electrochromism that the Fe(II)-based metallo-supramolecular polymer exhibits is described: the blue color of the polymer film disappears by the electrochemical oxidation of Fe(II) ions to Fe(III) and the colorless film becomes blue again by the electrochemical reduction of Fe(III) to Fe(II). The electrochromism is explained by the disappearance/appearance of the metal-to-ligand charge transfer absorption. The electrochromic properties are applicable to display devices such as electronic paper and smart windows.

Download or read book Synthesis and Characterization of Transition Metal containing Macromolecules written by Orval Edwin Ayers and published by . This book was released on 1973 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Concepts of Nanochemistry written by Ludovico Cademartiri and published by John Wiley & Sons. This book was released on 2009-10-13 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by a bestselling author and expert in nanochemistry, this title is ideal for interdisciplinary courses in chemistry, materials science, or physics.

Download or read book Dekker Encyclopedia of Nanoscience and Nanotechnology written by James A. Schwarz and published by CRC Press. This book was released on 2004 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis of Diazacrown Ether and Transition Metal Containing Polymers by Atom Transfer Radical Polymerization and Other Methods written by Suk-hang Chan and published by . This book was released on 2002 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 2D Metal Carbides and Nitrides MXenes written by Babak Anasori and published by Springer Nature. This book was released on 2019-10-30 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the rapidly expanding field of two-dimensional (2D) transition metal carbides and nitrides (MXenes). It covers fundamental knowledge on synthesis, structure, and properties of these new materials, and a description of their processing, scale-up and emerging applications. The ways in which the quickly expanding family of MXenes can outperform other novel nanomaterials in a variety of applications, spanning from energy storage and conversion to electronics; from water science to transportation; and in defense and medical applications, are discussed in detail.

Download or read book Polyoxometalate Self assembly written by Christopher Ritchie and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The work presented in this thesis highlights the influence of water soluble tertiary amines in the synthesis of transition metal substituted heteropolyoxometalates (TMSPs), with particular emphasis on polyanions based on the Keggin structure and lacunary derivatives thereof. In particular, an understanding is gained into the role that N,N'-bis(2-hydroxyethyl)piperazine (bhep) and morpholine (morph) play in the polyanion self-assembly process, with the successful isolation of molecular species, chains, layers and three dimensional frameworks. Each of the ligands were used in two different sets of synthetic investigation to probe their influence on the complete self-assembly of transition metal substituted tungstophosphates using Na2WO4 as the tungstate source, and by using the [XW10O36]8- X = Si, Ge precursors. Indeed, at no point in this work has the same polyanion been isolated using both the bhep and morpholine ligands, with this observation being indicative of each ligand having structure directing properties. Synthesis of TMSPs based on the phosphotungstate clusters in the presence of (bhep) has resulted in the isolation of clusters with nuclearities {W6}, {W7}, {W9}, {W10}, and {W11} which were only possible through fine control of the reaction pH which is aided by the ligands high buffer capacity. Additionally, in these compounds the ligand is observed to adopt a variety of coordination tendencies ranging from monodentate coordination through the ligands hydroxyl groups to chelation between nitrogen and oxygen donors. Specifically, the chelation of the ligand to CoII and NiII ions has allowed the rare inclusion of transition metal complexes into lacunary polyanions through a complimentary self-assembly process. Furthermore, the (bhep) ligand has been used to directly functionalise the [[gamma]-SiW10O36]8- polyanion through the controlled formation of W-OC linkages via a dehydration process. Interactions of the Morpholine ligand with heteropolytungsate clusters and transition metals in aqueous solution results in an array of markedly different structural motifs, which are highly depedant on the synthetic approach. The high basicity of the morpholine ligand results in its function as a buffer and cation within a pH domain that is underdeveloped in TMSP chemistry. Consequently, novel molecular species and functional materials have been isolated through the exploitation of this knowledge. The most significant of all the findings is the isolation of five mesoporous frameworks, which are composed solely of manganese or cobalt substituted Keggin polyanions which act as trigonal and tetrahedral nodes in the purely inorganic frameworks. Furthermore, the manganese containing frameworks have been shown to have cation exchange properties and are also redox active with single-crystal to single-crystal transformations being observed.

Download or read book SIZE CONTROLLED SYNTHESIS OF TRANSITION METAL NANOPARTICLES THROUGH CHEMICAL AND PHOTO CHEMICAL ROUTES written by Behzad Tangeysh and published by . This book was released on 2015 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: The central objective of this work is developing convenient general procedures for controlling the formation and stabilization of nanoscale transition metal particles. Contemporary interest in developing alternative synthetic approaches for producing nanoparticles arises in large part from expanding applications of the nanomaterials in areas such as catalysis, electronics and medicine. This research focuses on advancing the existing nanoparticle synthetic routes by using a new class of polymer colloid materials as a chemical approach, and the laser irradiation of metal salt solution as a photo-chemical method to attain size and shape selectivity. Controlled synthesis of small metal nanoparticles with sizes ranging from 1 to 5nm is still a continuing challenge in nanomaterial synthesis. This research utilizes a new class of polymer colloid materials as nano-reactors and protective agents for controlling the formation of small transition metal nanoparticles. The polymer colloid particles were formed from cross-linking of dinegatively charged metal precursors with partially protonated poly dimethylaminoethylmethacrylate (PDMAEMA). Incorporation of [PtCl6]2- species into the colloidal particles prior to the chemical reduction was effectively employed as a new strategy for synthesis of unusually small platinum nanoparticles with narrow size distributions (1.12 ± 0.25nm). To explore the generality of this approach, in a series of proof-of-concept studies, this method was successfully employed for the synthesis of small palladium (1.4 ±0.2nm) and copper nanoparticles (1.5 ±0.6nm). The polymer colloid materials developed in this research are pH responsive, and are designed to self-assemble and/or disassemble by varying the levels of protonation of the polymer chains. This unique feature was used to tune the size of palladium nanoparticles in a small range from 1nm to 5nm. The procedure presented in this work is a new convenient room temperature route for synthesis of small nanoparticles, and its application can be extended to the formation of other transition metals and alloy nanoparticles. This research also focuses on developing new photo-chemical routes for controlling the size and shape of the nanoparticles through high-intensity ultra-fast laser irradiation of metal salt solution. One of the core objectives of this work is to explore the special capabilities of shaped laser pulses in formation of metal nanoparticles through irradiation of the solutions by using simultaneous spatial and temporal focusing (SSTF). Femtosecond laser irradiation has not yet been widely applied for nanoparticle synthesis, and offers new regimes of energy deposition for synthesis of nanomaterials. Photo-reduction of aqueous [AuCl4]- solution to the gold nanoparticles (AuNPs) has been applied as a model process for optimizing the experimental procedures, and evaluating the potential of shaped laser pulses in the synthesis of AuNPs. Systematic manipulation of the laser parameters and experimental conditions provided effective strategies to control the size of Au nanoparticles in strong laser fields. Varying the concentration of polyethylene glycol (PEG45) as a surfactant effectively tuned the size of AuNPs from 3.9 ±0.7nm to 11.0 ±2.4nm, and significantly increased the rate of Au(III) reduction during irradiation. Comparative studies revealed the capability of shaped laser pulses in the generation of smaller and more uniform AuNPs (5.8 ±1.1nm) relative to the other conventional laser irradiation methods (7.2 ±2.9nm). Furthermore, a new laser-assisted approach has been developed for selective formation of triangular Au nanoplates in the absence of any surfactant molecule. This method relies on rapid energy deposition by using shaped, ultra-intense laser pulses to generate Au seeds in aqueous [AuCl4]- solution, and the slow post-irradiation reduction of un-reacted [AuCl4]- species by using H2O2 as a mild reducing agent. Variation of the laser irradiation-time was found as an effective strategy to tune the morphology of Au nanomaterials from nanospheres to triangular nanoplates. The surfactant-free Au nanoplates produced in this research can be readily functionalized with a variety of target molecules or surfactants for desirable applications such as biomedicine. The concept of rapid laser processing followed by in situ chemical reduction can be expanded as a general methodology for high-yield production of nanomaterials, and provides a series of new laser dependent parameters for controlling the nanoparticle formation.

Download or read book Metal Oxide Based Photocatalysis written by Adriana Zaleska-Medynska and published by Elsevier. This book was released on 2018-04-09 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal Oxide-Based Photocatalysis: Fundamentals and Prospects for Application explains the principles and fundamentals of metal oxide-based photocatalysis and the requirements necessary for their use in photocatalysis. It also discusses preparation methods for photocatalysis, and the advantages, disadvantages and achievements of the most important metal oxides (TiO2, ZnO, Fe2O3, Ta2O3, CuO, NiO, Cr2O3, RuO2, etc.). The book concludes with the most important photocatalytic applications and an overview of the future. Applications are organized by potential needs and solutions, addressing such areas as water treatment, hydrogen production, air treatment, chemical synthesis, and applications in medicine and construction. Provides coverage of applications, presenting needs and solutions Covers essential applications, such as water treatment, hydrogen production, air depollution, medical applications, and much more Includes the characterization of the most important metal oxides used in heterogeneous photocatalysis

Download or read book Handbook of Photochemistry written by Marco Montalti and published by CRC Press. This book was released on 2006-02-21 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the publication of the second edition of this handbook in 1993, the field of photochemical sciences has continued to expand across several disciplines including organic, inorganic, physical, analytical, and biological chemistries, and, most recently, nanosciences. Emphasizing the important role light-induced processes play in all of these fie