Download or read book Fabrication and characterisation of multilayer thin film using self assembly of colloidal gold and silica nanoparticles written by Zaheer Abbas Khan and published by GRIN Verlag. This book was released on 2016-06-20 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: Doctoral Thesis / Dissertation from the year 2011 in the subject Materials Science, Asian Insitute of Technology, language: English, abstract: A novel approach of multilayered thin film based on layer-by-layer deposition using colloidal nanoparticles was carried out in this work. The films were made by the self-assembly of oppositely charged metal and dielectric nanoparticles, alternately capped with polymers. Synthesized colloidal suspensions of gold nanoparticles (~20nm) and silica nanoparticles (~30nm) were used as the building blocks for the self-organisation of the films. Capping with PDDA and chitosan was used effectively to control the optical absorption of the surface plasmon resonance peaks of the gold nanoparticles. Using different combinations of layer formation, absorption characteristics in the near-ultraviolet (NUV), green and blue region were controlled through capping and varying the thickness of the film. Capping with chitosan or PDDA reduced the absorption peak of the coated silica nanoparticles in a similar fashion. Peak absorption in the UV range was achieved by assembling bare silica nanoparticles layers onto layers of gold nanoparticles. Transmission color was controlled (less than 1% color distance per added bi-layer) by changing the film thickness. Optical modeling of multilayer thin films constructed with oppositely charged nanoparticles helped us to understand phenomenon such as surface plasmon resonance, absorbance, transmittance and reflectance. Maxwell-Garnett effective medium theory in this case is applied in quasi-static limit to multilayer composite consisting of host material silica and inclusion material gold nanoparticles. Maxwell Garnett optical simulations is correlated with experimental spectra obtained for the thin film composites. The thickness of layers, size and spacing of metal inclusion is varied to alter the optical properties for the required device applications. The multilayered thin film of gold and silica resembles a structure consisting of large charge sheets of metal separated by a dielectric layer. When the applied electric potential reaches a threshold value, it drives the electrons to tunnel through the charge sheets producing a rectification effect. Therefore current-voltage measurements of the multilayer thin films were performed to calculate the threshold voltages. The electrical capacitance in these multilayer devices was modified with the change in thickness of the dielectric layers between two conducting layers and calculated by capacitance-voltage measurements of multilayer stack. [...]

Download or read book Multilayer Thin Films written by Gero Decher and published by John Wiley & Sons. This book was released on 2012-06-11 with total page 1157 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second, comprehensive edition of the pioneering book in this fi eld has been completely revised and extended, now stretching to two volumes. The result is a comprehensive summary of layer-by-layer assembled, truly hybrid nanomaterials and thin fi lms, covering organic, inorganic, colloidal, macromolecular, and biological components, as well as the assembly of nanoscale fi lms derived from them on surfaces. These two volumes are essential for anyone working in the field, as well as scientists and researchers active in materials development, who needs the key knowledge provided herein for linking the field of molecular self-assembly with the bio- and materials sciences.

Download or read book Characterization and Engineering of the Process of Directed Particle Self assembly in Thin Films and Sessile Droplets written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Directed self-assembly of colloidal particles confined between a solid and liquid interface has been studied as a versatile tool for organizing 2D and 3D crystalline arrays on solid substrates. The overarching goal of this study was to engineer the process of assembly to achieve simple and cost effective solutions for application needs were self-assembled particle structures work better than microfabricated ones. Two technologically relevant geometrical motifs of assembly were studied in detail. A thin film assembly technique based on controlled withdrawal of a meniscus was employed for modifying solid substrates with arrays of organic and inorganic colloidal particles. The assembled particles were used as a template for sterically directing the meso- and micro structure of metallic films for control over their electro-optical functionality. A sessile droplet templating technique was developed for fabricating arrays of discrete colloidal crystal patches of controlled shape and size. The process of assembly was studied in detail for each motif to optimize the deposition conditions and formulate protocols for controlling the size, composition, internal particle symmetry and overall shape. The methods and the results developed are relevant to different disciplines, including self-assembly, surface chemistry, Atomic Force Microscopy methodology, biological research and spectroscopy. Convective assembly and latex templating of gold nanoparticles was used to fabricate highly efficient nanostructured substrates for surface enhancing Raman scattering (SERS)-based sensors. The structure-dependent performance of these SERS substrates was systematically characterized with cyanide in a flow milli-fluidic chamber to simulate on-line continuous water monitoring. A matrix of experiments was designed to isolate the SERS contributions arising from meso- and microscale porosity, long range ordering of the micropores, and the thickness of the nanoparticle layer. The SERS results were.

Download or read book Fabrication Characterization and Optical Properties of Three dimensional Colloidal Gold Nanostructures written by Christopher James Addison and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 3-Dimensional nanostructures were constructed through the alternate immersion of aderivatized glass slide in solutions of propanedithiol and gold nanoparticles. The size andshape of the surface features could be controlled based on the number of nanoparticledepositions. Characterization of the substrates was performed using W-Visspectroscopy and atomic force microscopy. The multilayer nanoparticle substrates wereexamined for their suitability in surface-enhanced Raman scattering (SERS) by obtainingthe SERS spectrum of oxazine-720 on the substrates. A dramatic increase in the SERSsignal is noted with increasing nanoparticle layers and reaches a maximum for 11nanoparticle-layer depositions. The enhancement is attributed to the underlying surfacemorphology: Surface features on the order of 40 nm in size yield the greatest SERSenhancement due to surface plasmon (SP) excitation. The non-linear optical properties of colloidal nanostructures were examined using secondharmonic generation (SHG). A pronounced second harmonic emission was noted for 13nanoparticle layers and was attributed to SP excitation to yield surface-enhanced SHG. The self-assembly of gold nanorods to form 3-dimensional nanostructures was examined. While the self-assembly was not successful, the aggregated gold nanorods exhibited alarge SERS enhancement. This suggests that the incorporation of gold nanorods intoSERS substrates is a viable avenue for future research.

Download or read book Fabrication Characterization and Optical Properties of Three dimensional Colloidal Gold Nanostructures written by Christopher James Addison and published by . This book was released on 2005 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: 3-Dimensional nanostructures were constructed through the alternate immersion of aderivatized glass slide in solutions of propanedithiol and gold nanoparticles. The size andshape of the surface features could be controlled based on the number of nanoparticledepositions. Characterization of the substrates was performed using W-Visspectroscopy and atomic force microscopy. The multilayer nanoparticle substrates wereexamined for their suitability in surface-enhanced Raman scattering (SERS) by obtainingthe SERS spectrum of oxazine-720 on the substrates. A dramatic increase in the SERSsignal is noted with increasing nanoparticle layers and reaches a maximum for 11nanoparticle-layer depositions. The enhancement is attributed to the underlying surfacemorphology: Surface features on the order of 40 nm in size yield the greatest SERSenhancement due to surface plasmon (SP) excitation. The non-linear optical properties of colloidal nanostructures were examined using secondharmonic generation (SHG). A pronounced second harmonic emission was noted for 13nanoparticle layers and was attributed to SP excitation to yield surface-enhanced SHG. The self-assembly of gold nanorods to form 3-dimensional nanostructures was examined. While the self-assembly was not successful, the aggregated gold nanorods exhibited alarge SERS enhancement. This suggests that the incorporation of gold nanorods intoSERS substrates is a viable avenue for future research.

Download or read book Multilayer Thin Films written by Sukumar Basu and published by BoD – Books on Demand. This book was released on 2020-01-15 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, "Multilayer Thin Films-Versatile Applications for Materials Engineering", includes thirteen chapters related to the preparations, characterizations, and applications in the modern research of materials engineering. The evaluation of nanomaterials in the form of different shapes, sizes, and volumes needed for utilization in different kinds of gadgets and devices. Since the recently developed two-dimensional carbon materials are proving to be immensely important for new configurations in the miniature scale in the modern technology, it is imperative to innovate various atomic and molecular arrangements for the modifications of structural properties. Of late, graphene and graphene-related derivatives have been proven as the most versatile two-dimensional nanomaterials with superb mechanical, electrical, electronic, optical, and magnetic properties. To understand the in-depth technology, an effort has been made to explain the basics of nano dimensional materials. The importance of nano particles in various aspects of nano technology is clearly indicated. There is more than one chapter describing the use of nanomaterials as sensors. In this volume, an effort has been made to clarify the use of such materials from non-conductor to highly conducting species. It is expected that this book will be useful to the postgraduate and research students as this is a multidisciplinary subject.

Download or read book Evaporation Induced Self assembly and Characterization of Nanoparticulate Films written by Yipeng Yang and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer-based semiconducting materials are promising candidates for large-scale, low-cost photovoltaic devices. To date, the efficiency of these devices has been low in part because of the challenge of optimizing molecular packing while also obtaining a bicontinuous structure with a characteristic length comparable to the exciton diffusion length of 10 to 20 nm. In this dissertation we developed an innovative evaporation-induced nanoparticle self-assembly technique, which could be an effective approach to fabricate uniform, densely packed, smooth thin films with cm-scale area from home-made P3HT nanoparticles. Unlike the previous reports of nanoparticle-based film formation, we use a mixture of two solvents so that the solvent quality slowly decreases over time and particles aggregate at the air-liquid interface. The charge mobility of P3HT nanoparticle film fabricated using this technique is very similar to that of drop-cast P3HT films. Sintering (i.e. formation of contact discs between particles) and the effect of different size distribution of nanoparticle dispersion on film charge mobility were also studied. Binary films composed of P3HT and PCBM can be obtained using the same method from a suspension containing both P3HT and PCBM nanoparticles. The existence of PCBM in binary films was confirmed, and the relative composition of the two types of particles as a function of film-formation time was measured. Moreover, we show how to control the internal, molecular-scale structure within the P3HT nanoparticles and the absorption spectra by slowing the process of particle formation. These results provide an example of manipulating one phase of the active layer of OPV devices independently of the other phase.

Download or read book Organized Organic Ultrathin Films written by Katsuhiko Ariga and published by John Wiley & Sons. This book was released on 2012-09-24 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handy reference is the first comprehensive book covering both fundamentals and recent developments in the field with an emphasis on nanotechnology. Written by a highly regarded author in the field, the book details state-of-the-art preparation, characterization and applications of thin films of organic molecules and biomaterials fabricated by wet processes and also highlights applications in nanotechnology The categories of films covered include monomolecular films (monolayers) both on a water surface and on a solid plate, Langmuir-Blodgett films (transferred multilayer films on a solid plate from a water surface), layer-by-layer films (adsorbed multilayer films on a solid support), and spontaneously assembled films in solution.

Download or read book Nanoscale Materials written by Luis M. Liz-Marzán and published by Springer Science & Business Media. This book was released on 2007-05-08 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organized nanoassemblies of inorganic nanoparticles and organic molecules are building blocks of nanodevices, whether they are designed to perform molecular level computing, sense the environment or improve the catalytic properties of a material. The key to creation of these hybrid nanostructures lies in understanding the chemistry at a fundamental level. This book serves as a reference book for researchers by providing fundamental understanding of many nanoscopic materials.

Download or read book Selective Self assembly of Multilayer Thin films and Their Applications written by George Murakami Stern and published by . This book was released on 2009 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Modification of Nanostructured Thin Films written by Ion N. Mihailescu and published by MDPI. This book was released on 2020-03-17 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Special Issue “Synthesis and Modification of Nanostructured Thin Films” highlights the recent progress in thin film synthesis/modification and characterization. New methods are reviewed for the synthesis and/or modification of thin films based on laser, magnetron, chemical, and other techniques. The obtained thin nanostructures are characterized by complex and complementary techniques. We think that most of proposed methods can be directly applied in production, but some others still need further elaboration for long-term prospective applications in lasers, optics, materials, electronics, informatics, telecommunications, biology, medicine, and probably many other domains. The Guest Editor and the MDPI staff are therefore pleased to offer this Special Issue to interested readers, including graduate and PhD students as well as postdoctoral researchers, but also to the entire community interested in the field of nanomaterials. We share the conviction that this can serve as a useful tool for updating the literature, but also to aid in the conception of new production and/or research programs. There is plenty of room for further dedicated R&D advances based on new instruments and materials under development.

Download or read book Materials Nanoarchitectonics written by Katsuhiko Ariga and published by Elsevier. This book was released on 2023-12-07 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 Synthesis Characterization and Application of Thin Films and Mesostructured Materials Using Self asssembled Surfactant Templates written by Jared Rausch Archer and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Thin films and mesostructured materials were fabricated by a process in which the synthesis is directed by molecularly self-assembled surfactant templates. The formation of Langmuir monolayers and Langmui-Blodgett (LB) films with insoluble lipid amphiphiles (DPPC), reactive surfactants (OTS), and biomolecules (collagen) were studied. The monolayer and LB film characteristics were investigated for combinations of the above materials. The motivation for including collagen in the products was to explore the effects of a biomolecule and the possible preparation of materials with a more complex hierarchical structure. The precursor sol presented in this research is an advance in long-term stability for this type of material. Unlike prior attempts reported in the literature to create suitable precursors, this sol is chemically stable on a time scale of years. The condensation polymerization proceeds to form silicate oligomers of a relatively low molecular weight, but the chemical nature of the sol prevents the reaction from proceeding to the point at which phase separation occurs. The silicate polymerization proceeded spontaneously with the introduction of water to complete the mesoporous silica films studied. The application of the precursor sol to a liquid/liquid interface proved to be a novel approach to obtaining structured mesoporous films that are not affected or templated by a substrate. Addition of collagen molecules in the reaction results in the formation of only cubic structures, even if the reaction conditions would normally create lamellar or hexagonal structures. Mesoporous particles were obtained from surfactant templates in the reaction mixture. The addition of collagen proved to be an effective processing agent for the produced materials. The analysis of mesoporous silica particles with molybdenum showed limited catalytic activity with regard to propane oxidative dehydrogenation (ODH). The particles maintained high surface area and pore structure, but displayed low conversion rates of propane. The formation of mixed oxide catalyst supports, using the same method for preparing mesoporous silica particles, proved to have much better potential. The SiO2-TiO2 mixed oxides with molybdenum had higher surface areas, stronger molybdenum-oxygen bonds, and a strong increase in the reduction temperature compared with research using a modified sol-gel/co-precipitation technique.

Download or read book Advances in Thin Films Nanostructured Materials and Coatings written by Alexander D. Pogrebnjak and published by Springer. This book was released on 2019-02-08 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights the latest advances in chemical and physical methods for thin-film deposition and surface engineering, including ion- and plasma-assisted processes, focusing on explaining the synthesis/processing–structure–properties relationship for a variety of thin-film systems. It covers topics such as advances in thin-film synthesis; new thin-film materials: diamond-like films, granular alloys, high-entropy alloys, oxynitrides, and intermetallic compounds; ultra-hard, wear- and oxidation-resistant and multifunctional coatings; superconducting, magnetic, semiconducting, and dielectric films; electrochemical and electroless depositions; thin-film characterization and instrumentation; and industrial applications.

Download or read book Ultra low dielectric Constant Self assembled Nanostructured Porous Oxide Thin Films written by Richard Anthony Farrell and published by . This book was released on 2007 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis investigated the structural, film forming ability, electrical and mechanical properties of self assembled mesoporous silica thin films, microporous nanoparticle spin-on zeolite thin films and nano-composite mesoporous/microporous thin films with the potential use of employing these materials as future Back End of Line (BEoL) low dielectric constant materials is explored. Chapter 1 familiarizes the reader with the current status of low dielectric constant materials, the RC delay and future bottlenecks within the semiconductor industry concerning their speedy implementation. A summary is provided on nanostructured porous oxides synthesized by co-operative/evaporation induced self assembly (meso) and by crystallisation methods (micro/zeolites). Chapter II details the synthesis and characterisation of 2-D hexagonal ordered self-assembled mesoporous silica (MPS) thin films. The chapter establishes the individual pore size and interpore distances for all self-assembled MPS films fabricated with various templates by employing techniques such as RXRD, 2D SAXS, TEM, SEM and nitrogen physisorption. The choice of solvent used in the evaporation induced self assembly (EISA) process is also explored. Chapter III provides the techniques employed in the synthesis of colloidal microporous zeolite silicalite-1 nanoparticles with mean diameters below 100 nm. The films are highly uniform, transparent, and continuous. The crystalline nanoparticles have mean diameters of 60 nm with an average mesostructural void volume of 10-15 nm. Chapter 4 also introduces the nano-composite self-assembled mesoporous films (binder) with embedded zeolite nanoparticles. The nano-composite thin films offer increased cohesive strength over pure zeolite films whilst at the same time maintaining a low dielectric constant. Chapter IV describes the spincoating process and the variety of parameters such as sol-gel viscosity, sol-gel concentration and spinspeed exploited to control the final film thickness. Highly organized uniform porous films with film thickness values ranging from 50 nm to 800 nm can be readily synthesized. The periodicity of the films is influenced by both the shear forces and viscosity during spincoating. The intrinsic stress within the mesoporous films is quite large and can be directly correlated to the final film thickness (the critical thickness). Chapter V and Chapter VI features a comprehensive electrical study on the nanoporous dielectric films. The films exhibited high breakdown fields, low leakage currents, low dielectric constants, no frequency dispersions and low dissipation factors. The response of the films to temperature and humidity is investigated in detail. Films exhibit dielectric constants in the range of 2.32 to 2.84 depending on the porogen/pore size employed. The dominant leakage mechanism for the all the films was determined to be near Schottky type conduction assisted by space-charge-limited-conduction (SCLC) under high fields prior to breakdown. Chapter VII includes some of the on-going work on the nanomechanical properties of the self assembled films and microporous zeolite films. The films exhibit extremely low elastic modulus as a result of their inherent porosity. The mesoporous films demonstrate good adhesion properties considering their low elastic modulus whereas the zeolite films appear to have extremely low cohesive strengths. Chapter VIII summarises the work carried out within the thesis and considers the future applications of the mesoporous films. Chapter IX provides details on techniques such as small angle x-ray scattering (SAXS), chemical mechanical polishing (CMP), plasma etching (ICP), and nanoindentation (NI). The chapter also provides the calculations required for estimating the flatband voltage (Vfb) shifts, interface charge (Qint), mechanisms of current conduction (Poole-Frenkel or Schottky) and temperature dependent dielectric constants.

Download or read book Thin Film Coatings written by Fredrick Madaraka Mwema and published by CRC Press. This book was released on 2022-06-19 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thin Film Coatings: Properties, Deposition, and Applications discusses the holistic subject of conventional and emerging thin film technologies without bias to a specific technology based on the existing literature. It covers properties and delves into the various methods of thin film deposition, including the most recent techniques and a direction for future developments. It also discusses the cutting-edge applications of thin film coatings such as self-healing and smart coatings, biomedical, hybrid, and scalable thin films. Finally, the concept of Industry 4.0 in thin film coating technology is examined. This book: Explores a wide range and is not specific to material and method of deposition Demonstrates the application of thin film coatings in nearly all sectors, such as energy and anti-microbial applications Details the preparation and properties of hybrid and scalable (ultra) thin materials for advanced applications Provides detailed bibliometric analyses on applications of thin film coatings Discusses Industry 4.0 and 3D printing in thin film technology With its broad coverage, this comprehensive reference will appeal to a wide audience of materials scientists and engineers and others studying and developing advanced thin film technologies.

Download or read book Biopolymer Membranes and Films written by Mariana Agostini De Moraes and published by Elsevier. This book was released on 2020-06-19 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biopolymer Membranes and Films: Health, Food, Environment, and Energy Applications presents the latest techniques for the design and preparation of biopolymer-based membranes and films, leading to a range of cutting-edge applications. The first part of the book introduces the fundamentals of biopolymers, two-dimensional systems, and the characterization of biopolymer membranes and films, considering physicochemical, mechanical and barrier properties. Subsequent sections are organized by application area, with each chapter explaining how biopolymer-based membranes or films can be developed for specific innovative uses across the health, food, environmental and energy sectors. This book is a valuable resource for researchers, scientists and advanced students involved in biopolymer science, polymer membranes and films, polymer chemistry and materials science, as well as for those in industry and academia who are looking to develop materials for advanced applications in the health, food science, environment or energy industries. - Presents detailed coverage of a range of novel applications in key strategic areas across health, food, environment and energy - Considers the difficulties associated with two-dimensional materials - Assists the reader in selecting the best materials and properties for specific applications - Helps researchers, scientists and engineers combine the enhanced properties of membranes and films with the sustainable characteristics of biopolymer-based materials