Download or read book Block Copolymer Thin Films for Nanometer Pattern Generation and Nanostructure Synthesis written by Hai Wang 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, "Block Copolymer Thin Films for Nanometer Pattern Generation and Nanostructure Synthesis" by Hai, Wang, 王海, 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 BLOCK COPOLYMER THIN FILMS FOR NANOMETER PATTERN GENERATION AND NANOSTRUCTURE SYNTHESIS submitted by HAI WANG for the Degree of Doctor of Philosophy at The University of Hong Kong in August 2006 Block copolymers show great potential in nanofabrication, therefore, studies of self assembly in block copolymers and their application for nanostructure synthesis are of considerable interest. The self assembly of asymmetric di- block copolymer poly(styrene ethylene oxide) and poly(styrene-block-methyl methacrylate)thin...lmsisstudiedinthisthesisandtheapplicationofpoly(styrene ethyleneoxide) as astructuredirectingagent inthe synthesis of mesoporous ti- tania structure is also investigated. Firstly, factors aecting the self assembly were systemically examined for thin ...lms of two asymmetric diblock copolymers: poly(styrene-block-methyl methacrylate)(P(S-b-MMA))andpoly(styreneethyleneoxide)(P(S-b-EO)).ItwasfoundthatthemorphologyofP(S-b-MMA)isstronglythicknessdependent. Five representative morphologies are identi...ed. Contrary to generally-accepted concept, themorphologywithperpendicularPMMAcylindersinPSmatrixwas obtained for the ...lm thickness range of 48 nm to 63 nm on SiOx/Si substrates withoutapplyingexternalelectric...eldoranysurfacetreatment(hydrogenpas- sivation, functionalizedrandomcopolymers, orself-assembledmonolayers). The ...lms with uniform ordering at large scale can be obtained after annealing by choosing the proper spinning speed, solution concentration, substrate cleaning procedure, and annealing conditions. On the other hand, P(S-b-EO) thin ...lms donotexhibitthicknessdependenceofthemorphology. Perpendicularcylinders were obtained in all cases. Therefore, P(S-b-EO) has been chosen as a model system for comprehensive studies of factors aecting phase contrast in tapping modeatomicforcemicroscopy. Thecorrelationbetweenthephasecontrastand the elasticity of PEO domains and PS matrix in the poly(styrene ethylene ox- ide) thin ...lmwas established and explained with the energy dissipation theory. The phase contrast was also found to be dependent on the atomic force mi- croscope used due to dierent methods of detecting phase contrast in dierent microscopes. After detailed characterization of P(S-b-EO), this diblock copolymer was used as the structure directing agent for the synthesis of mesoporous titania nanostructures. The developed method for titania synthesis is simple and highly reproducible. The morphologies of the mesoporous titania structures can be controlled by titania precursor concentration, diblock copolymer P(S- b-EO), solvents and annealing conditions. The thermally stable mesoporous titania structure was used in heterojunction solar cells with device structure ITO/Titania/MEH-PPV/Au. The short circuit current densities of the solarcellswereimprovedoverthepreviousreports, whichcanbeattributedtobetter conjugatedpolymer...llingandincreasedchargecarrierpercolationpathsinthe bicontinuous titania mesostructure with large pore size. DOI: 10.5353/th_b3697984 Subjects: Copolymers Thin films Nanostructured materials - Synthesis

Download or read book Block Copolymer Thin Films for Nanometer Pattern Generation and Nanostructure Synthesis written by Hai Wang (Ph. D.) and published by . This book was released on 2006 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Directed Self assembly of Block Co polymers for Nano manufacturing written by Roel Gronheid and published by Woodhead Publishing. This book was released on 2015-07-17 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: The directed self-assembly (DSA) method of patterning for microelectronics uses polymer phase-separation to generate features of less than 20nm, with the positions of self-assembling materials externally guided into the desired pattern. Directed self-assembly of Block Co-polymers for Nano-manufacturing reviews the design, production, applications and future developments needed to facilitate the widescale adoption of this promising technology. Beginning with a solid overview of the physics and chemistry of block copolymer (BCP) materials, Part 1 covers the synthesis of new materials and new processing methods for DSA. Part 2 then goes on to outline the key modelling and characterization principles of DSA, reviewing templates and patterning using topographical and chemically modified surfaces, line edge roughness and dimensional control, x-ray scattering for characterization, and nanoscale driven assembly. Finally, Part 3 discusses application areas and related issues for DSA in nano-manufacturing, including for basic logic circuit design, the inverse DSA problem, design decomposition and the modelling and analysis of large scale, template self-assembly manufacturing techniques. Authoritative outlining of theoretical principles and modeling techniques to give a thorough introdution to the topic Discusses a broad range of practical applications for directed self-assembly in nano-manufacturing Highlights the importance of this technology to both the present and future of nano-manufacturing by exploring its potential use in a range of fields

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 Polymer Thin Films written by Ophelia Kwan Chui Tsui and published by World Scientific. This book was released on 2008 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ch. 1. Block copolymer thin films / J.-Y. Wang, S. Park and T. P. Russell -- ch. 2. Equilibration of block copolymer films on chemically patterned surfaces / G. S. W. Craig, H. Kang and P. F. Nealey -- ch. 3. Structure formation and evolution in confined cylinder-forming block copolymers / G. J. A. Sevink and J. G. E. M. Fraaije -- ch. 4. Block copolymer lithography for magnetic device fabrication / J. Y. Cheng and C. A. Ross -- ch. 5. Hierarchical structuring of polymer nanoparticles by self-organization / M. Shimomura ... [et al.] -- ch. 6. Wrinkling polymers for surface structure control and functionality / E. P. Chan and A. J. Crosby -- ch. 7. Crystallization in polymer thin films: morphology and growth / R. M. Van Horn and S. Z. D. Cheng -- ch. 8. Friction at soft polymer surface / M. K. Chaudhury, K. Vorvolakos and D. Malotky -- ch. 9. Relationship between molecular architecture, large-strain mechanical response and adhesive performance of model, block copolymer-based pressure sensitive adhesives / C. Creton and K. R. Shull -- ch. 10. Stability and dewetting of thin liquid films / K. Jacobs, R. Seemann and S. Herminghaus -- ch. 11. Anomalous dynamics of polymer Films / O. K. C. Tsui.

Download or read book Nanostructured Polymer Blends written by Gity Mir Mohamad Sadeghi and published by Elsevier Inc. Chapters. This book was released on 2013-11-28 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: Block copolymers (BCPs) consist of two or more chemically different polymers connected covalently, and are polymer alloys. Due to their thermodynamic incompatibility and chain connectivity, the phase separation between two (or more) blocks occurs only in a tens of nanometers range. Nanostructures are based on block copolymer self-assembly. They are functional nanomaterials less than 100nm in size and have received extensive scientific and technological attention due to their potential applications in electronic, biomedical, and optical materials. This chapter examines a variety of different synthetic strategies for preparation of linear diblock copolymers by anionic polymerization. Triblocks can be synthesized according to an appropriate synthetic pathway, depending on the monomers used and their sequence in the triblock chain. Nonlinear block copolymers including star block copolymers, graft copolymers, miktoarm star copolymers, cyclic block copolymers, and other complex architectures are explained. Microphase separation drives BCPs to self-assemble, resulting in ordered nanostructures, including spheres, cylinders, gyroids, and lamellae, depending on the composition of the BCP. In nanotechnology, self-assembly (SA) underlies various types of molecular structures built from nanoparticles, nanotubes, or nanorods. Supramolecular structures generated from amphiphilic block copolymers are characterized by a slow rate of intermicellar chain exchange which makes them interesting for a variety of applications. Basic principles of self-assembly and micellization of block copolymers in dilute solution, methods for stabilization of the macromolecular aggregates, are discussed. Stabilized nanoparticles, the so-called “smart materials,” which show responses to environmental changes (pH, temperature, ionic strength, etc.), are presented with a focus on their applications.

Download or read book Nanoparticles and Nanostructured Films written by Janos H. Fendler and published by John Wiley & Sons. This book was released on 2008-11-21 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this concise handbook leading experts give a broad overview of the latest developments in this emerging and fascinating field of nano-sized materials. Coverage includes new techniques for the synthesis of nanoparticles as well as an in-depth treatment of their characterization and chemical and physical properties. The future applications of these advanced materials are also discussed. The wealth of information included makes this an invaluable guide for graduate students as well as scientists in materials science, chemistry or physics - looking for a comprehensive treatment of the topic.

Download or read book Investigation and Optimisation of the Microphase Separation of Block Copolymer Thin Films for Use as Nanostructure Scaffolds and Pattern Transfer Masks written by Colm O'Mahony and published by . This book was released on 2010 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Upon, self-assembly block copolymers (BCP) form a variety of well-ordered nanometer-sized structures in thin films which satisfy the size requirement for many nanotechnologies. This thesis details the in-depth study of two different BCP systems including the various factors which influence the final film structure, the generation of nanoporous polymer templates and their subsequent use a lithographic etch masks. Chapter 1 provides a general introduction anda brief overview of the reasons for the research into BCP morphologies, the principals of their self-assembly and the potential applications of the systems. Chapter 2 focuses on microphase separation within cylinder-forming polystyrenepoly[ferrocenyldimethylsilane] BCP thin films. Thermal and solvent annealing were both investigated as potential routes to achieve microphase separation. With solvent annealing identified as the superior method, the effect of film thickness on the orientation and stability of the nanoscale structure was investigated. By using the directing effects imposed by topographically patterned substrates, cylindrical structures exhibiting excellent long-range order were achieved. Chapter 3 then summarises several methods of etching these polystyrene- poly[ferrocenyldimethylsilane] films, with reactive ion etching being identified as a rapid route for the generation of poly[ferrocenyldimethylsilane] template structures which can be subsequently used as a positive etch mask for pattern transfer into the underlying substrate. In Chapter 4, polymer brushes were grown from catalytic sites deposited on the substrate. These in-situ brushes were then examined as means of controlling the orientation of lamellar-forming polystyrene-poly(methylmethacrylate) thin films. Also, it was shown that variation of molecular weight of the BCP provides a simple means of controlling resultant feature sizes. The conclusions of all the research presented, as well as the potential future work generated by these results are discussed in Chapter 5. Chapter 6 provides a general overview of the various techniques used during the course of this thesis as well as providing supplementary information on other topics mentioned in previous chapters.

Download or read book Block Copolymers in Nanoscience written by Massimo Lazzari and published by Wiley-VCH. This book was released on 2007-06-27 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first book to take a detailed look at one of the key focal points where nanotechnology and polymers meet provides both an introductory view for beginners as well as in-depth knowledge for specialists in the various research areas involved. It investigates all types of application for block copolymers: as tools for fabricating other nanomaterials, as structural components in hybrid materials and nanocomposites, and as functional materials. The multidisciplinary approach covers all stages from chemical synthesis and characterization, presenting applications from physics and chemistry to biology and medicine, such as micro- and nanolithography, membranes, optical labeling, drug delivery, as well as sensory and analytical uses.

Download or read book Nanostructured Thin Films written by Maria Benelmekki and published by Elsevier. This book was released on 2019-08-25 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructured Thin Films: Fundamentals and Applications presents an overview of the synthesis and characterization of thin films and their nanocomposites. Both vapor phase and liquid phase approaches are discussed, along with the methods that are sufficiently attractive for large-scale production. Examples of applications in clean energy, sensors, biomedicine, anticorrosion and surface modification are also included. As the applications of thin films in nanomedicine, cell phones, solar cell-powered devices, and in the protection of structural materials continues to grow, this book presents an important research reference for anyone seeking an informed overview on their structure and applications. Shows how thin films are being used to create more efficient devices in the fields of medicine and energy harvesting Discusses how to alter the design of nanostructured thin films by vapor phase and liquid phase methods Explores how modifying the structure of thin films for specific applications enhances their performance

Download or read book Self Organized Nanostructures of Amphiphilic Block Copolymers II written by Axel H.E. Müller and published by Springer Science & Business Media. This book was released on 2011-08-13 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Block Copolymer Surfactant Mixtures in Aqueous Solution: Can we Achieve Size and Shape Control by Co-Micellization?, by Thomas Hellweg; Non-ionic Thermoresponsive Polymers in Water, by Vladimir Aseyev, Heikki Tenhu and Françoise Winnik; From Coordination Polymers to Hierarchical Self-Assembled Structures, by Yun Yan, Arie de Keizer, Martien A. Cohen Stuart and Nicolaas A. M. Besseling; Processes of Ordered Structure Formation in Polypeptide Thin Film Solutions, by Ioan Botiz, Helmut Schlaad and Günter Reiter; Amphiphilic Polymers at Interfaces, by Katarzyna Kita-Tokarczyk, Mathias Junginger, Serena Belegrinou and Andreas Taubert;

Download or read book Self assembly of Block Copolymers for Nanopatterning written by Nathanael Lap-Yan Wu and published by . This book was released on 2014 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: The impressive developments in the semiconductor industry over the past five decades have largely been dependent on the ability to continually reduce the dimensions of devices on a chip. However, as critical dimension requirements for these devices approach the limits of photolithography, new fabrication strategies must be introduced for these remarkable advances to continue. One technology listed by the International Technology Roadmap for Semiconductors as a candidate for next-generation nanostructure fabrication is the directed self-assembly of block copolymers. Block copolymers have received significant attention of late for their ability to template large regular arrays of nanostructures with dimensions ranging from 10 to 50 nm. The production of denser sub-10 nm nanostructures is also possible by reducing the size of these polymers, but a reduction of the polymer size also compromises the quality of nanostructures, making small polymers extremely difficult to use. In this thesis, two different patterning approaches are introduced to push the nanostructure density limits possible for a given polymer. In the first, a novel patterning approach involving thin films of bilayer block copolymer domains is used to effectively double the nanostructure density patterned by a given polymer. The technique is successfully applied to different types and sizes of polymer, and can also form highly controlled arrays of patterns with the help of surface topography. By varying different process parameters during the self-assembly or subsequent plasma steps, the dimensions of these density-doubled patterns may be finely-tuned to the desired width and pitch. The surface coverage of these density-doubled nanostructures is also maximized through adjusting the film thickness and parameters in the self-assembly process. Besides using bilayer films, dense arrays of nanostructures may also be patterned using a multi-step patterning approach. In this approach, multiple layers of block copolymer films are subsequently deposited onto the substrate to template nanostructures. Because nanostructures from previous layers contribute to the surface topography, they influence the self-assembly of successive layers and more dense and complex patterns may be produced as a result.

Download or read book Generating Micro and Nanopatterns on Polymeric Materials written by Aránzazu del Campo and published by John Wiley & Sons. This book was released on 2011-04-08 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt: New micro and nanopatterning technologies have been developed in the last years as less costly and more flexible alternatives to phtolithograpic processing. These technologies have not only impacted on recent developments in microelectronics, but also in emerging fields such as disposable biosensors, scaffolds for tissue engineering, non-biofouling coatings, high adherence devices, or photonic structures for the visible spectrum. This handbook presents the current processing methods suitable for the fabrication of micro- and nanostructured surfaces made out of polymeric materials. It covers the steps and materials involved, the resulting structures, and is rounded off by a part on applications. As a result, chemists, material scientists, and physicists gain a critical understanding of this topic at an early stage of its development.

Download or read book Nanomaterials written by Hideo Hosono and published by Elsevier. This book was released on 2006-08-08 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: A research project at the Tokyo Institute of Technology – dedicated to fostering innovation in the field of nanomaterials – was selected as one of the 21st Century COE (Center of Excellence) programs. The achievements of this COE program, which builds on the strong tradition of materials science in the Institute, are summarized within this book. Nanomaterials: Research Towards Applications is divided into four main parts: Revolutionary Oxides State-of-the-Art Polymers Nanostructure Design for New Functions Nanostructure Architecture for Engineering Applications Each section consists of three or four chapters related to inorganic, organic and metallic nanomaterials

Download or read book Next Generation Materials for Block Copolymer Lithography written by Michael Joseph Maher and published by . This book was released on 2016 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: The electronics industry is a trillion dollar industry that has drastically changed everyday life. Advances in lithography have enabled manufacturers to continually shrink the dimensions of microelectronic components, which has resulted in devices that outperform previous generations. Unfortunately, conventional patterning techniques are approaching their physical resolution limits. The ability to economically pattern sub-10 nm features is necessary for the future growth of the industry. Block copolymer self-assembly has emerged as a leading candidate for next generation lithography and nanofabrication because block copolymers self-assemble into periodic nanostructures (e.g. cylinders and lamellae) on a length scale that exceeds the physical limits of optical lithography. However, for block copolymer lithography to be realized, the block copolymer domains need to form sub-10 nm features and display etch resistance for pattern transfer. Additionally, the orientation, alignment, and placement of block copolymer domains must be carefully controlled. This dissertation discusses the synthesis, orientation and alignment of silicon-containing BCPs that are inherently etch resistant and provide access to nanostructures in the sub-10 nm regime. The orientation of domains is controlled by interactions between each block copolymer domain and each interface. Preferential interactions between the block copolymer domains and the either the substrate or air interface lead to a parallel orientation of domains, which is not useful for lithography. Non-preferential (“neutral”) interactions are needed to promote the desired perpendicular orientation. The synthesis of surface treatments and top coats is described, and methods to determine the preferential and non-preferential interactions are reported. Orientation control is demonstrated via rapid thermal annealing between two neutral surfaces. Combining orientation control of block copolymer domains with well established directed self-assembly strategies was used to produce perpendicular domains with long range order. Chapter 1 provides an introduction to lithography and block copolymer self-assembly. Chapter 2 discusses the synthesis of silicon-containing block copolymers. Chapters 4-6 focus on controlling block copolymer domain orientation, and Chapter 7 focuses on directed self-assembly. Chapter 8 covers spatial orientation control of domains using photopatternable interfaces. Finally, Chapter 9 covers tin-containing polymers that are resistant to fluorine-containing etch chemistries and can be used to pattern silicon oxide.

Download or read book Polymer Materials written by Kwang-Sup Lee and published by Springer Science & Business Media. This book was released on 2010-08-25 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: -On the Mechanisms Leading to Exfoliated Nanocomposites Prepared by Mixing By C. D. Han -Phase Behavior and Phase Transitions in AB- and ABA-type Microphase-Separated Block Copolymers By J. K. Kim, C. D. Han -New Class Materials of Organic–Inorganic Hybridized Nanocrystals/Nanoparticles, and Their Assembled Microand Nano-Structure Toward Photonics By H. Oikawa, T. Onodera, A. Masuhara, H. Kasai, H. Nakanishi -Poly(substituted Methylene) Synthesis: Construction of C–C Main Chain from One Carbon Unit By E. Ihara

Download or read book Fabrication and Characterization of Nanostructures from Self assembled Block Copolymers written by Joy Cheng and published by . This book was released on 2003 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanoscale magnetic dot arrays have attracted considerable interest, both for fundamental studies of micromagnetism and for possible applications in high-density magnetic data storage. Self-assembled block copolymers provide an alternative nanolithography technique to fabricate large-area nanomagnet arrays. Block copolymer thin films that micro-phase separate into periodic domains can be used as templates to define arrays of close-packed nanostructure, using a series of etching steps. Using polystyrene-polyferrocenyldimethyl-silane (PS-PFS), large-area polymer dots, silica dots and magnetic dots with periods of 56 nm were made using a series of plasma etching steps. Magnetometry techniques are used to characterize the bulk magnetic behavior of the dot arrays of Co, NiFe and pseudo spin valve structures. These dot arrays show strong magnetostatic interaction between the dots and within the dots. The self-assembly process is simple and low cost, however, the block copolymers typically have uncontrolled defects and lack long-range order. A topographically patterned substrate is used to guide the phase-separation in a subsequently deposited block copolymer film. The lateral dimensions of the patterns in the substrates, and interfacial interactions, are key factors in the ordering mechanism. Well-ordered block copolymer structures can be achieved under proper confinement conditions. In addition, the position of the polymer microdomains and defects in the array such as dislocations can be purposefully controlled by the design of the topographical guiding features. Combining topographic confinement with block copolymer lithographic methods will enable large-area ordered functional dot arrays to be made for various applications.