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Author : 陈惊雷
Publisher :
ISBN 13 :
Total Pages : 216 pages
Book Rating : 4.:/5 (14 download)
Download or read book Scanning Tunneling Microscopic Study of Transition Metal Dichalcogenide Ultrathin Films written by 陈惊雷 and published by . This book was released on 2018 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : 原梦菲
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (139 download)
Download or read book Scanning Tunneling Microscopic Study of Defects and Heterointerfaces of Transition Metal Dichalcogenides written by 原梦菲 and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Patrick Allen Thomas
Publisher :
ISBN 13 :
Total Pages : 474 pages
Book Rating : 4.:/5 (211 download)
Download or read book A Scanning Tunneling Microscopy Study of Metal Films and Supported Gold Particles written by Patrick Allen Thomas and published by . This book was released on 1989 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new type of Scanning Tunneling Microscope (STM) was designed and constructed to study the surface morphology of small catalyst particles. This is the first application of the STM in the study of supported metal particles. The STM was used to study the surface morphology of Au/Pd films that were sputter deposited onto mica and subsequently sintered in air, as well as equilibrium gold particles formed and supported on graphite. New structures were observed on both the film and particle samples. The surfaces are very rough on the nanometer scale range that the STM can easily resolve. The Au/Pd films were observed to deposit uniformly on atomically fat mica even at low thickness (50 A). Annealing the metal film resulted in surface roughening, and particle-like formations on the surface. The smooth film character disappeared after short annealing times, and extended annealing resulted in discontinuous film samples that could no longer be imaged with the STM. The surface roughness of small gold particles supported on graphite appeared to be dependent upon the particle size. Small particles ($$300 A) were seen to possess a wavy surface with generally smooth features. The significance of these results is greatest in the field of heterogeneous catalysis. The structures observed on these small, model catalyst materials, may provide an insight into the structure/function relationship of supported metal catalysts. Processing conditions appear to influence the surface structure of these small particles, perhaps allowing more specific catalyst preparations to be developed.
Author : Dongzhi Chi
Publisher : Elsevier
ISBN 13 : 0128165898
Total Pages : 338 pages
Book Rating : 4.1/5 (281 download)
Download or read book 2D Semiconductor Materials and Devices written by Dongzhi Chi and published by Elsevier. This book was released on 2019-10-19 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: 2D Semiconductor Materials and Devices reviews the basic science and state-of-art technology of 2D semiconductor materials and devices. Chapters discuss the basic structure and properties of 2D semiconductor materials, including both elemental (silicene, phosphorene) and compound semiconductors (transition metal dichalcogenide), the current growth and characterization methods of these 2D materials, state-of-the-art devices, and current and potential applications. Reviews a broad range of emerging 2D electronic materials beyond graphene, including silicene, phosphorene and compound semiconductors Provides an in-depth review of material properties, growth and characterization aspects—topics that could enable applications Features contributions from the leading experts in the field
Author : Jacopo Brivio
Publisher :
ISBN 13 :
Total Pages : 154 pages
Book Rating : 4.:/5 (863 download)
Download or read book Transmission Electron Microscopy and Nanoindentation Studies of Ultrathin Transition Metal Dichalcogenide Semiconductor Membranes written by Jacopo Brivio and published by . This book was released on 2013 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Shengyong Qin
Publisher :
ISBN 13 :
Total Pages : 254 pages
Book Rating : 4.:/5 (361 download)
Download or read book Low Temperature Scanning Tunneling Microscope Study of Metallic Thin Films and Nanostructures on the Semiconductor Substrates written by Shengyong Qin and published by . This book was released on 2008 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many properties of the thin films are different from the bulk value and in many cases, depend dramatically on the film thickness. In the metallic ultra-thin films epitaxially grown on the semiconductor substrate, the conduction electrons are confined by the vacuum and metal-semiconductor interface. When the film thickness is comparable to the electron Fermi wavelength, this confinement will produce discrete energy levels known as quantum well states (QWS), which dramatically modify the electronic structures of the thin film and this is called quantum size effect (QSE). QSE will have a profound effect on a lot of physical properties of the thin films. Among various systems exhibiting QSE, Pb/Si (111) is the most widely studied one and exhibits the richest phenomena in QSE. In this study, a home made low temperature Scanning Tunneling Microscopy/Spectroscopy (LT-STM/S) was used to study the superconductivities of the Pb thin films. Quantum oscillations of the superconductivity have been observed for the films down to 4 monolayer and the oscillation amplitude increases as the film gets thinner. To resolve the discrepancies between the superconductivities measured with ex-situ transport and in-situ STS. We also studied the influence of Au overlay on the Pb thin films with LT-STM/S, and found out the deposition of Au on Pb dramatically roughened the Pb films. Finally, we successfully grew large scale near perfect 2ML Pb films. There are two types of films which exhibit different Moiré patterns. LT-STS studies revealed there is big difference in the superconductivity Tc of these two films, both of which decreased dramatically from that of the 4ML film.
Author : Lu Jiao
Publisher : Open Dissertation Press
ISBN 13 : 9781361011973
Total Pages : 118 pages
Book Rating : 4.0/5 (119 download)
Download or read book GROWTH OF TRANSITION METAL DIC written by Lu Jiao and published by Open Dissertation Press. This book was released on 2017-01-26 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Growth of Transition Metal Dichalcogenide Thin Films by Molecular Beam Epitaxy" by Lu, Jiao, 焦璐, 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: Atomically thin transition metal dichalcogenides (TMD) have attracted intensive research interests due to their extraordinary properties and potential applications in electronics and optoelectronics. In this thesis, epitaxial growths of two-dimensional (2D) MoSe2 and WSe2 thin films were carried out in Molecular Beam Epitaxy (MBE). Multiple characterization techniques were employed to investigate thin films' structural, morphological, electronic and optical properties. A series of submonolayer MoSe2 coverage samples have been grown on highly ordered pyrolytic graphite (HOPG) substrate. Growth temperature and post-growth annealing temperature were seen to have obvious impacts on film's morphology and crystal quality. Layer-by-layer growth mode has been identified for the Van der Waals epitaxy of MoSe2 on HOPG. Dense networks of inversion domain boundaries (IDBs) have been observed in as-grown MoSe2 epifilms by scanning tunneling microscopy (STM) and transmission electron microscopy (TEM), and their density can be tuned by changing the MBE conditions. Scanning tunneling spectroscopy (STS) measurements reveal mid-gap electronic states associated with the IDB defects. STS measurements also reveal energy bandgaps of monolayer (ML) and bilayer (BL) MoSe2. ML WSe2 thin films were also grown at varying conditions on HOPG substrates through the Van der Waals epitaxy process and the growth characteristics were found similar to that of MoSe2. However, differences are also noted, particularly about the IDB defects. Contrary to MoSe2, as-grown WSe2 films do not contain the line defects. The reason behind such differences will be discussed. Finally, besides the STM/S studies about the morphological and electronic properties of MBE MoSe2 and WSe2 films, high quality samples have been synthesized on graphene-on-SiC substrate with reduced defect density and well-controlled thicknesses for some ex situ characterizations by photoluminescence and Raman spectroscopy methods. The results will be summarized and discussed in this thesis. Subjects: Molecular beam epitaxy Metallic films
Author : Mohamed Henini
Publisher : Elsevier
ISBN 13 : 0128121378
Total Pages : 790 pages
Book Rating : 4.1/5 (281 download)
Download or read book Molecular Beam Epitaxy written by Mohamed Henini and published by Elsevier. This book was released on 2018-06-27 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular Beam Epitaxy (MBE): From Research to Mass Production, Second Edition, provides a comprehensive overview of the latest MBE research and applications in epitaxial growth, along with a detailed discussion and ‘how to’ on processing molecular or atomic beams that occur on the surface of a heated crystalline substrate in a vacuum. The techniques addressed in the book can be deployed wherever precise thin-film devices with enhanced and unique properties for computing, optics or photonics are required. It includes new semiconductor materials, new device structures that are commercially available, and many that are at the advanced research stage. This second edition covers the advances made by MBE, both in research and in the mass production of electronic and optoelectronic devices. Enhancements include new chapters on MBE growth of 2D materials, Si-Ge materials, AIN and GaN materials, and hybrid ferromagnet and semiconductor structures. Condenses the fundamental science of MBE into a modern reference, speeding up literature review Discusses new materials, novel applications and new device structures, grounding current commercial applications with modern understanding in industry and research Includes coverage of MBE as mass production epitaxial technology and how it enhances processing efficiency and throughput for the semiconductor industry and nanostructured semiconductor materials research community
Author : Leon Kerr Wilson
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (594 download)
Download or read book The Study of Transition Metal Surfaces and Thin Films with Inverse Photoemission and Scanning Tunnelling Microscopy written by Leon Kerr Wilson and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Charles D. Ruggiero
Publisher :
ISBN 13 :
Total Pages : 72 pages
Book Rating : 4.:/5 (681 download)
Download or read book Scanning Tunneling Microscopy Studies of Cu2N Films written by Charles D. Ruggiero and published by . This book was released on 2009 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Scanning Tunneling Microscopy (STM) is used to study the geometric and electronic structure of Cu2N grown on the Cu(100) surface. Cu2N is a reconstruction of the Cu(100) surface caused by the adsorption of nitrogen atoms and shows insulating properties. A fundamental motivation for this work was to study the properties and size dependent evolution of an ultrathin insulating film. Insulating films of only a few atomic layers offer insight into the evolution of electronic structure and have been used to control electronic coupling at the nanoscale.
Author : Mohammad Karbalaei Akbari
Publisher : CRC Press
ISBN 13 : 1000072525
Total Pages : 277 pages
Book Rating : 4.0/5 ( download)
Download or read book Ultrathin Two-Dimensional Semiconductors for Novel Electronic Applications written by Mohammad Karbalaei Akbari and published by CRC Press. This book was released on 2020-07-30 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offering perspective on both the scientific and engineering aspects of 2D semiconductors, Ultrathin Two-Dimensional Semiconductors for Novel Electronic Applications discusses how to successfully engineer 2D materials for practical applications. It also covers several novel topics regarding 2D semiconductors which have not yet been discussed in any other publications. Features: Provides comprehensive information and data about wafer-scale deposition of 2D semiconductors, ranging from scientific discussions up to the planning of experiments and reliability testing of the fabricated samples Precisely discusses wafer-scale ALD and CVD of 2D semiconductors and investigates various aspects of deposition techniques Covers the new group of 2D materials synthesized from surface oxide of liquid metals and also explains the device fabrication and post-treatment of these 2D nanostructures Addresses a wide range of scientific and practical applications of 2D semiconductors and electronic and optoelectronic devices based on these nanostructures Offers novel coverage of 2D heterostructures and heterointerfaces and provides practical information about fabrication and application of these heterostructures Introduces the latest advancement in fabrication of novel memristors, artificial synapses and sensorimotor devices based on 2D semiconductors This work offers practical information valuable for engineering applications that will appeal to researchers, academics, and scientists working with and interested in developing an array of semiconductor electronic devices.
Author : Wenhai Han
Publisher :
ISBN 13 :
Total Pages : 214 pages
Book Rating : 4.:/5 (321 download)
Download or read book Scanning Tunneling Microscopy of the Transition Metal Dichalcogenide Tantalum Disulfide written by Wenhai Han and published by . This book was released on 1994 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Morten Østergaard Pedersen
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (471 download)
Download or read book Scanning Tunneling Microscopy Studies of Growth and Adsorption on Transition Metal Surfaces written by Morten Østergaard Pedersen and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Xinyu Liu
Publisher : Woodhead Publishing
ISBN 13 : 0081027362
Total Pages : 398 pages
Book Rating : 4.0/5 (81 download)
Download or read book Chalcogenide written by Xinyu Liu and published by Woodhead Publishing. This book was released on 2019-11-14 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chalcogenide: From 3D to 2D and Beyond reviews graphene-like 2D chalcogenide systems that include topological insulators, interesting thermoelectric structures, and structures that exhibit a host of spin phenomena that are unique to 2D and lower-dimensional geometries. The book describes state-of-the-art materials in growth and fabrication, magnetic, electronic and optical characterization, as well as the experimental and theoretical aspects of this family of materials. Bulk chalcogenides, chalcogenide films, their heterostructures and low-dimensional chalcogenide-based quantum structures are discussed. Particular attention is paid to findings that are relevant to the continued search for new physical phenomena and new functionalities. Finally, the book covers the enormous opportunities that have emerged as it has become possible to achieve lower-dimensional chalcogenide structures by epitaxial techniques. Provides readers with foundational information on the materials growth, fabrication, magnetic, electronic and optical characterization of chalcogenide materials Discusses not only bulk chalcogenides and chalcogenide thin films, but also two-dimensional chalcogenide materials systems Reviews the most important applications in optoelectronics, photovoltaics and thermoelectrics
Author : Toyo Kazu Yamada
Publisher :
ISBN 13 : 9789090190358
Total Pages : 193 pages
Book Rating : 4.1/5 (93 download)
Download or read book Study of Spin-polarized Scanning Tunneling Microscopy, Spectroscopy on Ultra-thin Magnetic Films and Multilayers written by Toyo Kazu Yamada and published by . This book was released on 2005 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Wenqing Liu
Publisher : Elsevier
ISBN 13 : 0081021542
Total Pages : 320 pages
Book Rating : 4.0/5 (81 download)
Download or read book Spintronic 2D Materials written by Wenqing Liu and published by Elsevier. This book was released on 2019-06-15 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spintronic 2D Materials: Fundamentals and Applications provides an overview of the fundamental theory of 2D electronic systems that includes a selection of the most intensively investigated 2D materials. The book tells the story of 2D spintronics in a systematic and comprehensive way, providing the growing community of spintronics researchers with a key reference. Part One addresses the fundamental theoretical aspects of 2D materials and spin transport, while Parts Two through Four explore 2D material systems, including graphene, topological insulators, and transition metal dichalcogenides. Each section discusses properties, key issues and recent developments. In addition, the material growth method (from lab to mass production), device fabrication and characterization techniques are included throughout the book. Discusses the fundamentals and applications of spintronics of 2D materials, such as graphene, topological insulators and transition metal dichalcogenides Includes an in-depth look at each materials system, from material growth, device fabrication and characterization techniques Presents the latest solutions on key challenges, such as the spin lifetime of 2D materials, spin-injection efficiency, the potential proximity effects, and much more
Author : Jun Wang
Publisher :
ISBN 13 : 9780549067399
Total Pages : 232 pages
Book Rating : 4.0/5 (673 download)
Download or read book Scanning Tunneling Microscopy Study of Surface Nucleation and Thin Film Growth: Semiconductors and Metal Oxides written by Jun Wang and published by . This book was released on 2007 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: The oxidation of Pd(100) in an oxygen plasma was studied. Different from O2 oxidation, which results in a ( 5x5 )R270 structure and an O coverage that saturates at 0.8 ML, temperature programmed desorption (TPD) and x-ray photoelectron spectroscopy (XPS) confirmed bulk PdO formation by plasma exposure at 550 K. TPD result of propene reaction on such surfaces showed only a single peak at 490 K for all carbon oxides and water, suggesting a direct oxidation pathway for the adsorbed intact propene molecules. The initial sticking coefficient of propene on the PdO clusters was close to unity indicating a high reaction rate on the oxide surface.
