Download or read book Synthesis and Characterization of Cubic Boron Nitride written by Ka Man Chan and published by . This book was released on 2004 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hexagonal Boron Nitride written by Kalim Deshmukh and published by Elsevier. This book was released on 2024-05-31 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hexagonal Boron Nitride: Synthesis, Properties, and Applications offers a comprehensive approach to hexagonal boron nitride (h-BN), covering synthesis, exfoliation, properties, characterization, functionalization, heterostructures, nanocomposites, and modelling and simulation, and guiding the reader towards advanced applications in biomedicine, electronics, energy storage, wastewater treatment, and other areas.The book begins by introducing hexagonal boron nitride, discussing classification, structure, synthesis methods, exfoliation, and functionalization techniques. This is followed by in-depth coverage of properties and characterization, as well as heterostructures and other two-dimensional materials, as well as nanocomposites. The fourth section of the book examines specific target applications, covering a range of cutting-edge areas including micro- and nano-electronics, anti-friction and anti-corrosive coatings, bone tissue engineering, wound healing, nanomedicine, drug delivery, catalysis, water treatment, energy storage and conversion, sensing and bio-sensing, and fire-retardant applications. Finally, computational modelling and simulation, and environmental aspects, are addressed in detail.This is a valuable resource for researchers and advanced students across nanotechnology, materials science, chemistry, environmental science, chemical engineering, biomedicine, electronics, and engineering. In an industrial setting, this book supports scientists, engineers, and R&D professionals with an interest in advanced 2D materials or nanomaterials for advanced applications. Presents the synthesis, properties, functionalization, and characterization methods for hexagonal boron nitride Explores novel applications across biomedicine, electronics, energy storage, and water treatment Addresses key challenges, such as biocompatibility, toxicity, and environmental and health impact

Download or read book Synthesis and Properties of Boron Nitride written by J.J. Pouch and published by Trans Tech Publications Ltd. This book was released on 1991-01-01 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: Boron nitride thin films can be deposited on different substrates using techniques such as plasma deposition, ion beam deposition and reactive sputter deposition.

Download or read book Synthesis and Characterization of Bulk Single Crystal Hexagonal Boron Nitride from Metal Solvents written by Benjamin Clubine and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Boron nitride is a purely synthetic material that has been known for over 150 years but only recently has sparked interest as a semiconductor material due to its potential in ultraviolet lasing and neutron detection. Thin-layer hexagonal boron nitride (hBN) is probably most attractive as a complementary material to graphene during its intense research endeavors. But for hBN to be successful in the realm of semiconductor technology, methods for growing large single crystals are critical, and its properties need to be accurately determined. In this study, hBN crystals were grown from metal solvents. The effects of soak temperature, soak time, source materials and their proportions on hBN crystal size and properties were investigated. The largest crystals of hBN measured five millimeters across and about 30 micrometers thick by precipitation from BN powder dissolved in a nickel-chromium solvent at 1700°C. High temperatures promoted outward growth of the crystal along the a-axis, whereas low temperatures promoted growth along the c-axis. Crystal growth at high temperatures also caused bulk hBN to adopt a triangular habit rather than a hexagonal one. A previously unreported method of synthesizing hBN was proven successful by substituting BN powder with elemental boron and a nitrogen ambient. XRD and Raman spectroscopy confirmed hBN from solution growth to be highly crystalline, with an 8.0 cm[superscript]-1 FWHM of the Raman peak being the narrowest reported. Photoluminescence spectra exhibited peaks mid-gap and near the band edge, suggesting impurities and defects in the hBN samples. However, high-purity reactants and post-growth annealing showed promise for synthesizing semiconductor-grade hBN. Several etchants were explored for defect-selective etching of hBN. A molten eutectic mixture of KOH/NaOH was the most effective defect-selective etchant of hBN at temperatures of 430-450°C for about one minute. The two prevalent hexagonal etch pit morphologies observed were deep, pointed-bottom pits and shallow, flat-bottom pits. TEM and SAED confirmed basal plane twists and dislocations in hBN crystals, but due to the highly anisotropic nature of hBN, their existence may be inevitable no matter the growth technique.

Download or read book Synthesis and Characterization of Boron Nitride Nanostructures Produced by Laser Chemical Vapor Deposition written by Arturo Hidalgo Córdova and published by . This book was released on 2012 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Boron Nitride Nanomaterials written by Ben McLean and published by CRC Press. This book was released on 2022-12-23 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: Boron nitride was first produced in the 18th century and, by virtue of its extraordinary mechanical strength, has found extensive application in industrial processes since the 1940s. However, the more recent discovery that boron nitride allotropes are as structurally diverse as those of carbon (e.g. fullerenes, graphene, carbon nanotubes) has placed this material, and particularly its low-dimensional allotropes, back at the forefront of modern material science. This book provides a comprehensive history of this rapid rise in the status of boron nitride and boron nitride nanomaterials, spanning the earliest examples of three-dimensional boron nitride allotropes, through to contemporary structures such as monolayer hexagonal boron nitride, boron nitride nanomeshes, boron nitride nanotubes and the incorporation of boron nitride into cutting-edge van der Waals heterostructures. It specifically focuses on the properties, applications and synthesis techniques for each of these allotropes and examines how the evolution in boron nitride production methods is linked to that in our understanding of how low-dimensional nanomaterials self-assemble, or ‘grow’, during synthesis. The book demonstrates the key synergy between growth mechanisms and the development of new, advanced nanostructured materials.

Download or read book Surface Chemistry Microstructure and Tribological Properties of Cubic Boron Nitride Films written by and published by . This book was released on 1998 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Characterization of Cubic Boron Nitride Interfaces with in Situ Photoelectron Spectroscopy written by Joseph Shammas and published by . This book was released on 2016 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cubic boron nitride (c-BN) has potential for electronic applications as an electron emitter and serving as a base material for diodes, transistors, etc. However, there has been limited research on c-BN reported, and many of the electronic properties of c-BN and c-BN interfaces have yet to be reported. This dissertation focused on probing thin film c-BN deposited via plasma enhanced chemical vapor deposition (PECVD) with in situ photoelectron spectroscopy (PES). PES measurements were used to characterize the electronic properties of c-BN films and interfaces with vacuum and diamond. First, the interface between c-BN and vacuum were characterized with ultraviolet PES (UPS). UPS measurements indicated that as-deposited c-BN, H2 plasma treated c-BN, and annealed c-BN post H2 plasma treatment exhibited negative electron affinity surfaces. A dipole model suggested dipoles from H-terminated N surface sites were found to be responsible for the NEA surface. Then, Si was introduced into c-BN films to realize n-type doped c-BN. The valence structure and work function of c-BN:Si films were characterized with XPS and UPS measurements. Measurements were unable to confirm n-type character, and it is concluded that silicon nitride formation was the primary effect for the observations. Finally, XPS measurements were employed to measure the band offsets at the c-BN/diamond interface. Measurements indicated the valence band maximum (VBM) of c-BN was positioned ~0.8 eV above the VBM of diamond.

Download or read book Chemical Vapor Deposition Growth and Characterization of Two Dimensional Hexagonal Boron Nitride written by Roland Yingjie Tay and published by Springer. This book was released on 2018-06-20 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis focuses on the growth of a new type of two-dimensional (2D) material known as hexagonal boron nitride (h-BN) using chemical vapor deposition (CVD). It also presents several significant breakthroughs in the authors’ understanding of the growth mechanism and development of new growth techniques, which are now well known in the field. Of particular importance is the pioneering work showing experimental proof that 2D crystals of h-BN can indeed be hexagonal in shape. This came as a major surprise to many working in the 2D field, as it had been generally assumed that hexagonal-shaped h-BN was impossible due to energy dynamics. Beyond growth, the thesis also reports on synthesis techniques that are geared toward commercial applications. Large-area aligned growth and up to an eightfold reduction in the cost of h-BN production are demonstrated. At present, all other 2D materials generally use h-BN as their dielectric layer and for encapsulation. As such, this thesis lays the cornerstone for using CVD 2D h-BN for this purpose.

Download or read book Boron Nitride Nanotubes written by Chee Huei Lee and published by . This book was released on 2010 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis Characterization and Pyrolysis Chemistry of Precursors for Metal Nitride boron Nitride Composites written by Maomoan Fan and published by . This book was released on 1994 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Boron Nitride Nanotubes Produced by Ball Milling and Annealing Method written by Jun Yu and published by . This book was released on 2005 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Preparation and Characterization of Materials written by J Honig and published by Elsevier. This book was released on 2012-12-02 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preparation and Characterization of Materials brings together the proceedings of the Indo-U.S. Workshop on the Preparation and Characterization of Materials, held on February 19-23, 1981, at the Indian Institute of Science in Bangalore, India. The papers focus on advances and developments in the preparation and characterization of materials such as ferroics, layered materials, metal oxides and other electronic materials, amorphous materials including glasses, and high-temperature ceramics. This book is comprised of 25 chapters and begins with a discussion on crystal growth and other preparation techniques, touching on topics such as solid state synthesis of complex oxides and preparation of soft ferrites. The application of neutron scattering techniques and analytical electron microscopy to materials research and materials science is then considered, along with the dielectric and electro-optic applications of ferroics and the preparation and characterization of synthetic layered inorganic ion exchangers. Subsequent chapters deal with metal oxides and other electronic materials; glasses and other amorphous materials; and high-temperature ceramics such as silicon nitride. This monograph will be of interest to materials scientists and engineers as well as students and researchers in materials science.

Download or read book Boron Nitride written by Eugene Moran and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A hexagonal boron nitride nanosheet (BNNS) is an atomic-thick 2D material that exhibits many interesting properties such as high chemical stability and excellent mechanical and thermal properties. In Chapter One, the authors introduce two methods for the exfoliation of BNNS from hexagonal boron nitride (hBN). Then, methodologies for the surface functionalisation and nanocomposite construction are demonstrated by two BNNS based nanocomposites. The catalytic performance of the BNNS based nanocomposites is also evaluated and discussed in detail. Chapter two evaluates the formation of rolled hexagonal boron nitride nano-sheets (h-BN nanoscrolls) on their unique morphology, magnetic properties and applications. Due to the high chemical and thermal stabilities, as well as atomically smooth surfaces with free of dangling bonds, hBN has been used as barriers, passivation and support layers in 2D electronic devices, to maximise the electrical and optical characterisation of 2D materials. However, there still remains a challenge in obtaining large-area and high-quality hBN film for real 2D electronic devices. Chapter Three focuses on chemical vapor deposition (CVD), a promising method to overcome these limitations. Chapter Four discusses how a boron doped armchair graphene ribbon has been shown by cyclic voltammetry to be a potential catalyst to replace platinum, however the reaction catalysed was not identified. The authors use density functional calculations to show the reaction catalysed is likely dissociation of HO2. Chapter Five reveals a novel and industrially feasible route to incorporate boron nitride nanoparticles (BNNPs) in radiation-shielding aerospace structural materials. Chapter Six deals with the preparation and characterisation of boron nitride nanotube (BNNT)-reinforced biopolyester matrices. The morphology, hydrophilicity, biodegradability, cytotoxicity, thermal, mechanical, tribological and antibacterial properties of the resulting nanocomposites are discussed in detail. Chapter Seven presents theoretical estimations regarding the compressive buckling response of single walled boron nitride nanotubes (SWBNNTs), which have a similar crystal structure as single walled carbon nanotubes (SWCNTs). Moreover, SWBNNTs have excellent mechanical, insulating and dielectric properties. Finally, Chapter Eight shows how the different exchange mechanisms can be distinguished and measured by studying solid films where part of the 3He is replaced by immobile Ne atoms. The authors also show how the formation energy of vacancies and vacancy tunneling frequency can be obtained from NMR studies at high temperature.

Download or read book Chemical vapor deposition growth written by United States. Department of Energy and published by . This book was released on 1977 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis Characterization and Fabrication of Boron Nitride and Carbon Nanomaterials Their Applications and the Extended Pressure Inductively Coupled Plasma Synthesis of Boron Nitride Nanotubes written by Aidin Fathalizadeh and published by . This book was released on 2016 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanoscale materials made of carbon, boron, and nitrogen, namely BCN nanostructures, exhibit many remarkable properties making them uniquely suitable for a host of applications. Boron nitride (BN) and carbon (C) nanomaterials are structurally similar. The forms studied here originate from a two-dimensional hexagonally arranged structure of sp2 bonded atoms. These nanomaterials exhibit extraordinary mechanical and thermal properties. However, the unique chemical compositions of carbon and boron nitride result in differing electrical, chemical, biological, and optical properties. In this work, we explore the single layer sheets of sp2 bonded carbon (graphene), and their cylindrical forms (nanotubes) of carbon and boron nitride. In the first part of this work, we look at carbon based nanomaterials. In Chapter 2, the electron field emission properties of carbon nanotubes (CNTs) and their implementation as nanoelectromechanical oscillators in an integrated device will be discussed. We show a technique hereby a single CNT is attached to a probe tip and its electron field emission characterized. We then delve into the fabrication of a field emitting CNT oscillator based integrated device using a silicon nitride membrane support. We then present the electron field emission capabilities of these devices and discuss their potential use for detection of nuclear magnetic resonance (NMR) signals. Graphene is the subject of study in Chapter 3. We begin by extensively examining the synthesis of graphene using a chemical vapor deposition (CVD) process, ultimately establishing techniques to control graphene domain size, shape, and number of layers. We then discuss the application of the single-atom thick, but ultra-mechanically strong graphene as a capping layer to trap solutions in a custom fabricated silicon nitride membrane to enable transmission electron microscopy (TEM) of liquid environments. In this manner, the volume and position of liquid cells for electron microscopy can be precisely controlled and enable atomic resolution of encapsulated particles. In the second portion of this work, we investigate boron nitride nanostructures and in particular nanotubes. In Chapter 4, we present the successful development and operation of a high-throughput, scalable BN nanostructures synthesis process whereby precursor materials are directly and continuously injected into a novel high-temperature, Extended-Pressure Inductively-Coupled plasma system (EPIC). The system can be operated in a near-continuous fashion and has a record output of over 35 g/hour for pure, highly crystalline boron nitride nanotubes (BNNTs). We also report the results of numerous runs exploring the wide range of operating parameters capable with the EPIC system. In Chapter 5, we examine the impurities present in as-synthesized BNNT materials. Several methods of sample purification are then investigated. These include chemical oxidation, using both gas and liquid phase based methods, as well as physical separation techniques. The large scale synthesis of BNNTs has opened the door for further studies and applications. In Chapter 6, we report a novel wet-chemistry based route to fill in the inner cores of BNNTs with metals. For the first time, various metals are loaded inside of BNNTs, forming a plethora of structures (such as rods, short nanocrystals, and nanowires), using a solution-based method. We are also able to initiate and observe dynamics of the metallic nanoparticles, including their movement, splitting, and fusing, within a BNNT.

Download or read book BORON NITRIDE NANOSTRUCTURES written by and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : The popularity of boron nitride nanomaterials for their application in areas like electronics, photovoltaic, biomedical, automobile, and so on has increased in the recent era. Some unique properties make BNNTs outstanding for biomedical and photovoltaic applications, such as their optical transparency, electrical insulation, and biological compatibility. Hence large-scale synthesis of high-purity small-diameter BNNTs is required. On the other hand, research on the origin of excitation-dependent fluorescence (EDF) in BN dots is in its infancy. So, in this dissertation, we studied the growth mechanism of high-purity BNNTs with diameters smaller than 30nm. Additionally, we synthesized two different types of BN dots [sonication-assisted solvothermal (ss) BN dots and liquid nitrogen (LN) exfoliated BN dots], and studied their fluorescent properties. For the first time, we exploited the EDF property of the ss BN dots for solar cells. Here, we define ss BN dots as a pseudo-core/shell structure of DMA-CO and BN nanosheets and use them as the solar absorber (active layers, AL) to yield an efficiency of 1.51%. Our work is the first demonstration using biological and environmentally friendly colloidal nanomaterials for solar cells. In addition, we determined, for the first time, the biocompatible doses of ss BN dots for use in live HeLa cells. We found ss BN dots are suitable for live cell staining at doses below