Author: Publisher:
ISBN: 9781605112855
Category :
Languages : en
Pages :
Book Description
Artificially Induced Crystalline Alignment in Thin Films and Nanostructures
Author: Artificially Induced Crystalline Alignment in Thin Films and Nanostructures
Author: A. T. FindikogluPublisher:
ISBN: 9781618395153
Category : Crystalline electric field
Languages : en
Pages : 56
Book Description
Artificially Induced Grain Alignment in Thin Films:
Author: Vladimir MatiasPublisher: Cambridge University Press
ISBN: 9781107408357
Category : Technology & Engineering
Languages : en
Pages : 210
Book Description
Thin-film growth is a very old art and an established scientific field in materials science. For decades, growth of monocrystal-like films has been practiced by making use of epitaxy on monocrystalline substrates. In the quest for greater control of materials, the next level of achievement will be to grow well-oriented thin films on arbitrary substrates, i.e., without the need for monocrystalline substrates. That is the goal of artificially inducing grain alignment in thin films. Texturing methods show significant promise in fabricating technologically attractive grain-aligned films. However, over the last three decades a variety of methods for grain alignment have been demonstrated with varying degrees of success. The focus of this book is on physical vapor deposition methods for growth of inorganic thin films, with special attention paid to ion beam assisted deposition (IBAD) texturing. Topics include: milestones in IBAD texturing; IBAD texturing; IBAD long-length application and texturing by other techniques.
Non-Classical Crystallization of Thin Films and Nanostructures in CVD and PVD Processes
Author: Nong Moon HwangPublisher: Springer
ISBN: 9401776164
Category : Science
Languages : en
Pages : 338
Book Description
This book provides a comprehensive introduction to a recently-developed approach to the growth mechanism of thin films and nanostructures via chemical vapour deposition (CVD). Starting from the underlying principles of the low pressure synthesis of diamond films, it is shown that diamond growth occurs not by individual atoms but by charged nanoparticles. This newly-discovered growth mechanism turns out to be general to many CVD and some physical vapor deposition (PVD) processes. This non-classical crystallization is a new paradigm of crystal growth, with active research taking place on growth in solution, especially in biomineralization processes. Established understanding of the growth of thin films and nanostructures is based around processes involving individual atoms or molecules. According to the author’s research over the last two decades, however, the generation of charged gas phase nuclei is shown to be the rule rather than the exception in the CVD process, and charged gas phase nuclei are actively involved in the growth of films or nanostructures. This new understanding is called the theory of charged nanoparticles (TCN). This book describes how the non-classical crystallization mechanism can be applied to the growth of thin films and nanostructures in gas phase synthesis. Based on the author’s graduate lecture course, the book is aimed at senior undergraduate and graduate students and researchers in the field of thin film and nanostructure growth or crystal growth. It is hoped that a new understanding of the growth processes of thin films and nanostructures will reduce trial-and-error in research and in industrial fabrication processes.
Synthesis and Modification of Nanostructured Thin Films
Author: Ion N. MihailescuPublisher: MDPI
ISBN: 3039284541
Category : Technology & Engineering
Languages : en
Pages : 276
Book Description
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.
Metal-Induced Crystallization
Author: Zumin WangPublisher: CRC Press
ISBN: 9814463418
Category : Science
Languages : en
Pages : 317
Book Description
Crystalline semiconductors in the form of thin films are crucial materials for many modern, advanced technologies in fields such as microelectronics, optoelectronics, display technology, and photovoltaic technology. Crystalline semiconductors can be produced at surprisingly low temperatures (as low as 120C) by crystallization of amorphous semicon
Investigation of Metal-induced Crystallization of Silicon Thin Films and Silicon Based Nanostructures
Author: Kai WangIon Beam Induced Structural Modifications in Nano-crystalline Permalloy Thin Films
Author: Olga RoshchupkinaFunctionality Tuning in Vertically Aligned Nanocomposite Thin Films
Author: Aiping ChenPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Vertically aligned nanocomposite (VAN) oxide thin films are unique nanostructures with two-phase self-assembled, heteroepitaxially grown on single-crystal substrates. Both phases tend to grow vertically and simultaneously on a given substrate with lattice matching in the system. The nanostructured thin film system could form different in-plane morphologies including nano-checkerboard, nanopillar in matrix and nanomaze structures. The VAN thin films with tunable vertical lattice strain and novel microstructures provide fascinating approaches to achieve enhanced functionalities. In this dissertation, the microstructure and vertical strain effect on low-field magnetoresistance (LFMR) have been investigated in heteroepitaxial La0.7Sr0.3MnO3 (LSMO):CeO2 and LSMO:ZnO VAN thin films with a vertical strain of 0.13 % and 0.5 %, respectively. We demonstrate that LFMR can be tuned by column width and vertical strain in these VAN systems, i.e., smaller column width and larger vertical strain could result in a larger LFMR in the vertical nanocomposite heteroepitaxial thin films. The physical mechanism of enhanced LFMR in LSMO-based VAN has been explored. Single-phase LSMO and LSMO-based VANs have been grown on different substrates with different secondary phase compositions. Substrate effect in single-phase LSMO films shows that LFMR tends to increase with grain misorientation factor because the cross-section of electron conduction paths reduces as grain misorientation factor increases. (LSMO)1-x:(ZnO)x VAN heteroepitaxial films without large angle grain boundary (GB) have been used to study the pure phase boundary (PB) effect on the LFMR. It shows that increased PBs tends to reduce the cross-section of the conducting path and thus favor the spin-dependent tunneling in nanomaze structures with ferromagnetic/insulating/ferromagnetic vertical sandwiches. Tilted aligned LSMO nanostructured films with artificial GBs have been designed to investigate pure GBs influence on LFMR. The results indicate that decoupling of neighboring ferromagnetic (FM) domains by artificial GBs is necessary to achieve enhanced LFMR properties; and the strength of the GBs can be controlled by post-annealing to tune the LFMR effect. The VAN heteroepitaxial films display excellent microstructure compatibility and strain tuning. Perovskite oxides can be combined with many other oxide materials to form VAN architectures. The microstructure and lattice strain in the unique heteroepitaxial VANs can be used to engineer and tune the existing/new functionalities. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/149429
Vertically Aligned Nanocomposite Thin Films
Author: Zhenxing BiPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Vertically aligned nanocomposite (VAN) thin films have recently stimulated significant research interest to achieve better material functionality or multifunctionalities. In VAN thin films, both phases grow epitaxially in parallel on given substrates and form a unique nano-checkerboard structure. Multiple strains, including the vertical strain which along the vertical interface and the substrate induced strain which along the film and substrate interface, exist in VAN thin films. The competition of these strains gives a promise to tune the material lattice structure and future more the nanocomposite film physical properties. Those two phases in the VAN thin films are selected based on their growth kinetics, thermodynamic stability and epitaxial growth ability on given substrates. In the present work, we investigated unique epitaxial two-phase VAN (BiFeO3)x:(Sm2O3)1-x and (La0.7Sr0.3MnO3)x:(Mn3O4)1-x thin film systems by pulsed laser deposition. These VAN thin films exhibit a highly ordered vertical columnar structure with good epitaxial quality. The strain of the two phases can be tuned by deposition parameters, e.g. deposition frequency and film composition. Their strain tunability is found to be related directly to the systematic variation of the column widths and domain structures. Their physical properties, such as dielectric loss and ferromagnetisms can be tuned systematically by this variation. The growth morphology, microstructure and material functionalities of VAN thin films can be varied by modifying the phase ratio, substrate orientation or deposition conditions. Systematic study has been done on growing (SrTiO3)0.5:(MgO)0.5 VAN thin films on SrTiO3 and MgO substrates, respectively. The variation of column width demonstrates the substrate induced strain plays another important role in the VAN thin film growth. The VAN thin films also hold promise in achieving porous thin films with ordered nanopores by thermal treatment. We selected (BiFeO3)0.5:(Sm2O3)0.5 VAN thin films as a template and get uniformly distributed bi-layered nanopores. Controllable porosity can be achieved by adjusting the microstructure of VAN (BiFeO3):(Sm2O3) thin films and the annealing parameters. In situ heating experiments within a transmission electron microscope column provide direct observations into the phases transformation, evaporation and structure reconstruction during the annealing. Systematic study in this dissertation demonstrate that the vertically aligned nanocomposite microstructure is a brand new architecture in thin films and an exciting approach that promises tunable material functionalities as well as novel nanostructures.