Rhenium Disulfide and Rhenium-doped MoS2 Thin Films from Single Source Precursors PDF Download

Author: Naktal Al-Dulaimi
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: D.J. Fisher
Publisher: Materials Research Forum LLC
ISBN: 1945291931
Category : Technology & Engineering
Languages : en
Pages : 150

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Rhenium disulfide, especially in low-dimensional form, is a subject of lively research into its electronic and optical properties. The field of twodimensional materials such as graphene and its analogues has been growing very rapidly. This class of materials also includes rhenium disulfide and rhenium diselenide, which belong to the transition-metal dichalcogenide family. Due to their reduced crystal symmetry, they exhibit distinct electrical and optical characteristics along certain in-plane crystal directions. The group-VI members such as molybdenum and tungsten are the most typical ones, but group-VII rhenium disulfide has been attracting most attention of late because of its unusual structural, electro-optical and chemical properties; especially an indirect-to-direct band-gap transition which occurs when thinned down from bulk to monolayer. The group-VI transition-metal dichalcogenides have a 1H, 2H, 3R or 1T structure, whereas ReS2 has a distorted 1T structure which imparts an in-plane anisotropy to its physical properties. Few other materials (black phosphorus, ReSe2, TiS3, ZrS3) exhibit such an in-plane structural anisotropy. This makes ReS2 unique among the transition-metal chalcogenides. Atomically thin rhenium disulphide is characterized by weak interlayer coupling and a distorted 1T structure, which leads to the anisotropy in optical and electrical properties. It also possesses structural and vibrational anisotropy, layer-independent electrical and optical properties and metal-free magnetism. In these respects, it differs from group-VI transition-metal dichalcogenides such as MoS2, MoSe2, WS2 and WSe2. It is already being used in solid-state electronics, catalysis, energy storage and energy-harvesting applications.

Author: Hannah Giang
Publisher:
ISBN:
Category : Alloy plating
Languages : en
Pages : 256

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This dissertation presents studies electrodeposited MoS2 and metal-doped MoS2 thin films, and their performance for energy storage, catalysis, and biosensor applications. Ni-doped MoS2 thin films were fabricated by electrodeposition from electrolytes containing both MoS42- and varying concentrations of Ni2+, followed by annealing at 400 °C for 2 h in an Ar atmosphere. The film resistivity increased from 11.3 -cm for un-doped MoS2 to 32.8-cm for Ni-doped MoS2 containing 9 atom% Ni. For all Ni dopant levels studied, only the x-ray diffraction (XRD) pattern expected for MoS2 is observed, with the average grain size increases with increasing Ni content. Ni-doped MoS2 thin films were tested for their activity towards the hydrogen evolution reaction (HER) in 0.5M H2SO4. Tafel equation fits reveal that the catalytic activity for HER, as measured by the exchange current density, increases up to 6 atom% Ni, and then decreases slightly for 9 atom% Ni. Ni-doped MoS2 thin films were also tested in 1.0 M Na2SO4 for use within electrochemical supercapacitors, and the capacitance per unit area increases by 2-3x for 9 atom% Ni-doped MoS2 relative to un-doped MoS2. The highest specific capacitance obtained for Ni-doped MoS2 during galvanostatic charge-discharge measurements is ~300 F/g. Similarly, electrodeposited MoS2 and Cu-doped MoS2 thin-film electrodes were evaluated as new platforms for biosensor applications. The study of immobilization of antibody fragments to 3-phenoxybenzoic acid (3-PBA) via disulfide (S-S) reduction with tris(2-carboxyethyl) phosphine (TCEP) atop MoS2 and Cu-doped MoS2 thin films is reported in this dissertation. In this study, the two biosensor substrates were tested for their ability to immobilize antibody fragments, before and after annealing in Ar at 500 °C for 3 h. The annealing process removes excess sulfur in the as-deposited films and creates coordinatively unsaturated Mo sites that are highly reactive towards sulfur, which was reported for MoS2 hydrodesulphurization catalysts. These coordinatively unsaturated Mo sites were able to bind to S atoms in antibody fragments forming Mo-S bond. Electrochemical impedance spectroscopy (EIS) measurements for both annealed MoS2 and Cu-doped MoS2 demonstrate that these thin films adsorb antibody fragments through Mo-S bond formation, unlike the as-deposited MoS2 and Cu-doped MoS2 thin films, which are unable to bind to antibody fragments. Impedance detection of 3-PBA using annealed MoS2 substrate biosensor format has a detection limit of 2.11x10-7 M and a sensitivity of 2.74x108 ·cm2·M-1, whereas annealed Cu-doped MoS2 substrate has a detection limit of 3.75x10-8 M and a sensitivity of 5.96x108 ·cm2·M-1. Electrochemical methods were also utilized to improve surface adhesion of cells atop glassy carbon electrodes. A successfully established enrichment process for methanogens that converts CO2 to CH4 with high production efficiency and selectivity by the single-chamber microbial electrochemical cell (MEC) is presented for the first time. The isolated methanogens from a methanogenic microbial community collected from the formation water in the San Juan coal basin (Colorado, USA) was well adapted to a defined medium without any carbon source and was able to actively convert CO2 to CH4, with an average production rate of 0.47 0.05 mL day-1 cm-2 at an applied potential of 600 mV. The biofilm formation at the graphite cathode that is crucial to CH4 production was only observed after an electrochemical pre-treatment. DNA sequencing analysis showed that only two species from the Archaea kingdom survived a long duration of exposure to CO2 and CH4 production, which are methanobacterium sp. (81.4%), and methanoculleus sp. (18.6%). The active surviving species from the Bacterial kingdom was predominantly anaerobaculum thermoterrnum (67.1%).

Author: Alexander V. Kolobov
Publisher: Springer
ISBN: 3319314505
Category : Technology & Engineering
Languages : en
Pages : 545

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This book summarizes the current status of theoretical and experimental progress in 2 dimensional graphene-like monolayers and few-layers of transition metal dichalcogenides (TMDCs). Semiconducting monolayer TMDCs, due to the presence of a direct gap, significantly extend the potential of low-dimensional nanomaterials for applications in nanoelectronics and nano-optoelectronics as well as flexible nano-electronics with unprecedented possibilities to control the gap by external stimuli. Strong quantum confinement results in extremely high exciton binding energies which forms an interesting platform for both fundamental studies and device applications. Breaking of spatial inversion symmetry in monolayers results in strong spin-valley coupling potentially leading to their use in valleytronics. Starting with the basic chemistry of transition metals, the reader is introduced to the rich field of transition metal dichalcogenides. After a chapter on three dimensional crystals and a description of top-down and bottom-up fabrication methods of few-layer and single layer structures, the fascinating world of two-dimensional TMDCs structures is presented with their unique atomic, electronic, and magnetic properties. The book covers in detail particular features associated with decreased dimensionality such as stability and phase-transitions in monolayers, the appearance of a direct gap, large binding energy of 2D excitons and trions and their dynamics, Raman scattering associated with decreased dimensionality, extraordinarily strong light-matter interaction, layer-dependent photoluminescence properties, new physics associated with the destruction of the spatial inversion symmetry of the bulk phase, spin-orbit and spin-valley couplings. The book concludes with chapters on engineered heterostructures and device applications such as a monolayer MoS2 transistor. Considering the explosive interest in physics and applications of two-dimensional materials, this book is a valuable source of information for material scientists and engineers working in the field as well as for the graduate students majoring in materials science.

Author: Narayanasamy Sabari Arul
Publisher: Springer
ISBN: 9811390452
Category : Technology & Engineering
Languages : en
Pages : 355

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This book presents advanced synthesis techniques adopted to fabricate two-dimensional (2D) transition metal dichalcogenides (TMDs) materials with its enhanced properties towards their utilization in various applications such as, energy storage devices, photovoltaics, electrocatalysis, electronic devices, photocatalysts, sensing and biomedical applications. It provides detailed coverage on everything from the synthesis and properties to the applications and future prospects of research in 2D TMD nanomaterials.

Author: A. Miller
Publisher: CRC Press
ISBN: 0429524935
Category : Science
Languages : en
Pages : 325

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Ultrafast photonics has become an interdisciplinary topic of high international research interest because of the spectacular development of compact and efficient lasers producing optical pulses with durations in the femtosecond time domain. Present day long-haul telecommunications systems are almost entirely based on the transmission of short burst

Author: Milton Bradley Company
Publisher: Legare Street Press
ISBN: 9781018572789
Category : Literary Collections
Languages : en
Pages : 0

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This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Author: Perrin Walker
Publisher: CRC Press
ISBN: 9781439822531
Category : Science
Languages : en
Pages : 1434

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This publication presents cleaning and etching solutions, their applications, and results on inorganic materials. It is a comprehensive collection of etching and cleaning solutions in a single source. Chemical formulas are presented in one of three standard formats - general, electrolytic or ionized gas formats - to insure inclusion of all necessary operational data as shown in references that accompany each numbered formula. The book describes other applications of specific solutions, including their use on other metals or metallic compounds. Physical properties, association of natural and man-made minerals, and materials are shown in relationship to crystal structure, special processing techniques and solid state devices and assemblies fabricated. This publication also presents a number of organic materials which are widely used in handling and general processing...waxes, plastics, and lacquers for example. It is useful to individuals involved in study, development, and processing of metals and metallic compounds. It is invaluable for readers from the college level to industrial R & D and full-scale device fabrication, testing and sales. Scientific disciplines, work areas and individuals with great interest include: chemistry, physics, metallurgy, geology, solid state, ceramic and glass, research libraries, individuals dealing with chemical processing of inorganic materials, societies and schools.

Author: Zongyu Huang
Publisher: CRC Press
ISBN: 1000562840
Category : Science
Languages : en
Pages : 166

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Monoelemental 2D materials called Xenes have a graphene-like structure, intra-layer covalent bond, and weak van der Waals forces between layers. Materials composed of different groups of elements have different structures and rich properties, making Xenes materials a potential candidate for the next generation of 2D materials. 2D Monoelemental Materials (Xenes) and Related Technologies: Beyond Graphene describes the structure, properties, and applications of Xenes by classification and section. The first section covers the structure and classification of single-element 2D materials, according to the different main groups of monoelemental materials of different components and includes the properties and applications with detailed description. The second section discusses the structure, properties, and applications of advanced 2D Xenes materials, which are composed of heterogeneous structures, produced by defects, and regulated by the field. Features include: Systematically detailed single element materials according to the main groups of the constituent elements Classification of the most effective and widely studied 2D Xenes materials Expounding upon changes in properties and improvements in applications by different regulation mechanisms Discussion of the significance of 2D single-element materials where structural characteristics are closely combined with different preparation methods and the relevant theoretical properties complement each other with practical applications Aimed at researchers and advanced students in materials science and engineering, this book offers a broad view of current knowledge in the emerging and promising field of 2D monoelemental materials.

Author: Babak Anasori
Publisher: Springer Nature
ISBN: 3030190269
Category : Technology & Engineering
Languages : en
Pages : 534

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This book describes the rapidly expanding field of two-dimensional (2D) transition metal carbides and nitrides (MXenes). It covers fundamental knowledge on synthesis, structure, and properties of these new materials, and a description of their processing, scale-up and emerging applications. The ways in which the quickly expanding family of MXenes can outperform other novel nanomaterials in a variety of applications, spanning from energy storage and conversion to electronics; from water science to transportation; and in defense and medical applications, are discussed in detail.