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Chemistry Of Two Dimensional Transition Metal Carbides Mxenes
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Book Synopsis 2D Metal Carbides and Nitrides (MXenes) by : Babak Anasori
Download or read book 2D Metal Carbides and Nitrides (MXenes) written by Babak Anasori and published by Springer Nature. This book was released on 2019-10-30 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Transition Metal Carbides and Nitrides (MXenes) Handbook by : Chuanfang Zhang
Download or read book Transition Metal Carbides and Nitrides (MXenes) Handbook written by Chuanfang Zhang and published by John Wiley & Sons. This book was released on 2024-07-23 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive overview of the synthesis of high-quality MXenes In Transition Metal Carbides and Nitrides (MXenes) Handbook: Synthesis, Processing, Properties and Applications, a team of esteemed researchers provides an expert review encompassing the fundamentals of precursor selection, MXene synthesis, characterizations, properties, processing, and applications. You’ll find detailed discussions of the selection of MXene members for specific applications, as along with summaries of the physical and chemical properties of MXenes, including electrical, mechanical, optical, electromechanical, electrochemical, and electromagnetic properties. The authors delve into both successful and unsuccessful synthesis examples, offering detailed explanations of various failures to facilitates a comprehensive understanding of the reasons behind unsuccessful syntheses. Additionally, they provide detailed examinations on the characterizations of MXenes, empowering readers to develop a sophisticated understanding of how to achieve optimal quality, flake size, oxidation states, and more. You’ll also find: A thorough review of common applications of MXenes, including electrochemical applications, electromagnetic interference shielding, communications devices, and more Comprehensive explorations of solution and non-solution processing of MXenes Practical discussions of the synthesis of high-quality MXene powders, colloidal solutions and flakes, including information about MXene precursors Fulsome treatments of MXene precursor selection and their impact on MXene quality Tailored to meet the needs of graduate students, researchers, and scientists in the areas of materials science, inorganic chemistry, and physical chemistry, the Transition Metal Carbides and Nitrides (MXenes) Handbook will also benefit biochemists and professionals working in drug delivery.
Book Synopsis Transition Metal Carbides and Nitrides by : Louis Toth
Download or read book Transition Metal Carbides and Nitrides written by Louis Toth and published by Elsevier. This book was released on 2014-04-11 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Refractory Materials, Volume 7: Transition Metal Carbides and Nitrides discusses the developments in transition metal carbide and nitride research. This volume is organized into nine chapters that emphasize the mechanical and superconducting properties of these compounds. The introductory chapters deal with the general properties, preparation techniques, characterization, crystal chemistry, phase relationships, and thermodynamics of transition metal carbides and nitrides. The following chapter highlights the mechanical properties of these compounds, such as elastic and plastic deformation, fracture, strengthening mechanisms, and hardness. The discussion then shifts to specific electrical and magnetic properties, including electrical resistivity, Hall coefficient, and magnetic susceptibility. A separate chapter is devoted to carbides and nitrides as superconductors. The concluding chapters explore certain theories that explain the mechanisms of band structure and bonding in carbides and nitrides. This volume is of great value to research workers in metallurgy, ceramics, physics, chemistry, and related fields, as well as to advanced students investigating problems concerning high temperature materials or interstitial compounds.
Book Synopsis Surface characterization of 2D transition metal carbides (MXenes) by : Ingemar Persson
Download or read book Surface characterization of 2D transition metal carbides (MXenes) written by Ingemar Persson and published by Linköping University Electronic Press. This book was released on 2019-05-20 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research on two-dimensional (2D) materials is a rapidly growing field owing to the wide range of new interesting properties found in 2D structures that are vastly different from their three-dimensional (3D) analogues. In addition, 2D materials embodies a significant surface area that facilitates a high degree of surface reactions per unit volume or mass, that is imperative in many applications such as catalysis, energy storage, energy conversion, filtration, and single molecule sensing. MXenes constitute a family of 2D materials consisting of transition metal carbides and/or nitrides, which are typically formed after selective etching of their 3D parent MAX phases. The latter, are a family of nanolaminated compounds that typically follow the formula Mn+1AXn (n=1-3), where M is a transition metal, A is a group 13 or 14 element, and X is C and or N. Selective etching by aqueous F- containing acids removes the A layer leaving 2D Mn+1Xn slabs instantly terminated by a mix of O-, OH- and F-groups. The first and most investigated MXene is Ti3C2TX, where TX stands for surface termination, which has shown record properties in a range of applications (eg. electrode in Li-batteries, supercapacitors, sieving membrane, electromagnetic interference shielding, and carbon capture). Adding to that, over 30 different MXenes have been discovered since 2011, exhibiting alternative or superior properties. Most importantly, elegant routes for property design in the MXene family has been demonstrated, by means of either varying the chemistry in the Mn+1Xn compound, by alloying two M elements, or by changing the structure of the MXene by introducing vacancies. The present work has a led to an additional route for post synthesis property tuning in MXenes by manipulation of surface termination elements. This enables a unique toolbox for property tuning which is not available to other 2D materials and is highly beneficial for applications that is dependent on surface reactions. Furthermore, chemical and structural characterization of terminations on single sheets is essential to rule out the influence of intercalants or contamination that is typically present in multilayer MXene samples or thin films. For that purpose, a method for preparing isolated contamination free single sheets of MXene samples for transmission electron microscopy (TEM) characterization was established. In order to determine vacancy and termination sites, atomically resolved scanning (S)TEM imaging and image simulations was carried out. Two main processes were employed to substitute the termination elements. 1) An initial thermal treatment in vacuum facilitates F desorption and it was shown that O-terminations rearranges on the evacuated sites. H2 gas exposure in a controlled environment demonstrated a removal of the remaining O-terminations. As a result, termination-free MXene is possible to realize under vacuum conditions. 2) CO2 was introduced as a first non-inherent termination on MXene by in situ CO2 gas exposure at low temperatures. That was a first demonstration of Ti3C2TX as promising material for carbon capture. Additionally, O-saturated surfaces were demonstrated after introduction of O2 gas on the F-depleted Ti3C2TX MXene, which is highly relevant for hydrogen evolution reactions where fully O-terminated Ti3C2TX are predicted to improve efficiency. A Lewis acid melt synthesis method was used to realize the first MXene exclusively terminated with Cl. Moreover, this was the first report of a MXene directly synthesised with terminations other than O, OH, and F. Furthermore, we have expanded the space of property tuning by introduction of chemical ordering, by selective etching of Y in an alloyed (Mo2/3Y1/3)2CTX MXene. This either produced chemical ordering with one M (Mo) element and vacancies, or ordering between two M (Mo and Y) elements. This was further reported to significantly increase volumetric capacitance because of the increased number of active sites around vacancies, leading to an increasing charge density. As a final note, the stability of Nb2CTX MXene under ambient conditions was investigated. It was found that the surface Nb adatoms, present after etching, got oxidized over time which resulted in local clustering and effectively degraded the MXene. This work has demonstrated reproducible surface characterization methods for determining termination elements and sites in 2D MXenes, that is ultimately governing MXene properties. Most importantly, we report on a new approach for MXene property tuning as well as contributing to several existing property tuning approaches.
Book Synopsis Synthesis and transport properties of 2D transition metal carbides (MXenes) by : Joseph Halim
Download or read book Synthesis and transport properties of 2D transition metal carbides (MXenes) written by Joseph Halim and published by Linköping University Electronic Press. This book was released on 2018-09-28 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the isolation and characterization of graphene, there has been a growing interest in 2D materials owing to their unique properties compared to their 3D counterparts. Recently, a family of 2D materials of early transition metal carbides and nitrides, labelled MXenes, has been discovered (Ti2CTz, Ti3C2Tz, Mo2TiC2Tz, Ti3CNTz, Ta4C3Tz, Ti4N3Tz among many others), where T stands for surface-terminating groups (O, OH, and F). MXenes are mostly produced by selectively etching A layers (where A stands for group A elements, mostly groups 13 and 14) from the MAX phases. The latter are a family of layered ternary carbides and/or nitrides and have a general formula of Mn+1AXn (n = 1-3), where M is a transition metal and X is carbon and/or nitrogen. The produced MXenes have a conductive carbide core and a non-conductive O-, OH- and/or F-terminated surface, which allows them to work as electrodes for energy storage applications, such as Li-ion batteries and supercapacitors. Prior to this work, MXenes were produced in the form of flakes of lateral dimension of about 1 to 2 microns; such dimensions and form are not suitable for electronic characterization and applications. I have synthesized various MXenes (Ti3C2Tz, Ti2CTz and Nb2CTz) as epitaxial thin films, a more suitable form for electronic and photonic applications. These films were produced by HF, NH4HF2 or LiF + HCl etching of magnetron sputtered epitaxial Ti3AlC2, Ti2AlC, and Nb2AlC thin films. For transport properties of the Ti-based MXenes, Ti2CTz and Ti3C2Tz, changing n from 1 to 2 resulted in an increase in conductivity but had no effect on the transport mechanism (i.e. both Ti3C2Tx and Ti2CTx were metallic). In order to examine whether the electronic properties of MXenes differ when going from a few layers to a single flake, similar to graphene, the electrical characterization of a single Ti3C2Tz flake with a lateral size of about 10 μm was performed. These measurements, the first for MXene, demonstrated its metallic nature, along with determining the nature of the charge carriers and their mobility. This indicates that Ti3C2Tz is inherently of 2D nature independent of the number of stacked layers, unlike graphene, where the electronic properties change based on the number of stacked layers. Changing the transition metal from Ti to Nb, viz. comparing Ti2CTz and Nb2CTz thin films, the electronic properties and electronic conduction mechanism differ. Ti2CTz showed metallic-like behavior (resistivity increases with increasing temperature) unlike Nb2CTz where the conduction occurs via variable range hopping mechanism (VRH) - where resistivity decreases with increasing temperature. Furthermore, these studies show the synthesis of pure Mo2CTz in the form of single flakes and freestanding films made by filtering Mo2CTz colloidal suspensions. Electronic characterization of free-standing films made from delaminated Mo2CTz flakes was investigated, showing that a VRH mechanism prevails at low temperatures (7 to ≈ 60 K). Upon vacuum annealing, the room temperature, RT, conductivity of Mo2CTx increased by two orders of magnitude. The conduction mechanism was concluded to be VRH most likely dominated by hopping within each flake. Other Mo-based MXenes, Mo2TiC2Tz and Mo2Ti2C3Tz, showed VRH mechanism at low temperature. However, at higher temperatures up to RT, the transport mechanism was not clearly understood. Therefore, a part of this thesis was dedicated to further investigating the transport properties of Mo-based MXenes. This includes Mo2CTz, out-of-plane ordered Mo2TiC2Tz and Mo2Ti2C3Tz, and vacancy ordered Mo1.33CTz. Magneto-transport of free-standing thin films of the Mo-based MXenes were studied, showing that all Mo-based MXenes have two transport regimes: a VRH mechanism at lower temperatures and a thermally activated process at higher temperatures. All Mo-based MXenes except Mo1.33CTz show that the electrical transport is dominated by inter-flake transfer. As for Mo1.33CTz, the primary electrical transport mechanism is more likely to be intra-flake. The synthesis of vacancy ordered MXenes (Mo1.33CTz and W1.33CTz) raised the question of possible introduction of vacancies in all MXenes. Vacancy ordered MXenes are produced by selective etching of Al and (Sc or Y) atoms from the parent 3D MAX phases, such as (Mo2/3Sc1/3)2AlC, with in-plane chemical ordering of Mo and Sc. However, not all quaternary parent MAX phases form the in-plane chemical ordering of the two M metals; thus the synthesis of the vacancy-ordered MXenes is restricted to a very limited number of MAX phases. I present a new method to obtain MXene flakes with disordered vacancies that may be generalized to all quaternary MAX phases. As proof of concept, I chose Nb-C MXene, as this 2D material has shown promise in several applications, including energy storage, photothermal cell ablation and photocatalysts for hydrogen evolution. Starting from synthetizing (Nb2/3Sc1/3)2AlC quaternary solid solution and etching both the Sc and Al atoms resulted in Nb1.33C material with a large number of vacancies and vacancy clusters. This method may be applicable to other quaternary or higher MAX phases wherein one of the transition metals is more reactive than the other, and it could be of vital importance in applications such as catalysis and energy storage.
Book Synopsis MXenes and their Composites by : Kishor Kumar Sadasivuni
Download or read book MXenes and their Composites written by Kishor Kumar Sadasivuni and published by Elsevier. This book was released on 2021-10-07 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt: MXenes and their Composites: Synthesis, Properties and Potential Applications presents a state of the art overview of the recent developments on the synthesis, functionalization, properties and emerging applications of two-dimensional (2D) MXenes and their composites.The book systematically describes the state-of-the-art knowledge and fundamentals of MXene synthesis, structure, surface chemistry and functionalization. The book also discusses the unique electronic, optical, mechanical and topological properties of MXenes. Besides, this book covers the various emerging applications of MXenes and their composites across different fields such as energy storage and conversion, gas sensing and biosensing, rechargeable lithium and sodium-ion batteries, lithium-sulphur and multivalent batteries, electromagnetic interference shielding, hybrid capacitors and supercapacitors, hydrogen storage, catalysis and photoelectrocatalysis, gas separation and water desalination, environmental remediation and medical and biomedical applications. All these applications have been efficiently discussed in the specific chapters and in each case, the processing of MXene composites has also been discussed.This book will be an excellent reference for scientists and engineers across various disciplines and industries working in the field of highly promising 2D MXenes and their composites. The book will also act as a guide for academic researchers, material scientists, and advanced students in investigating the new applications of 2D MXenes based materials. Covers fundamentals of technologically important MAX phases, MXene derivatives, MXene synthesis methods, intercalation and delamination strategies, surface functionalization, fundamental characteristics and properties Demonstrates major application areas of MXenes, including catalytic, energy storage and energy generation, flexible electronics, EMI shielding, sensors and biosensors, medical and biomedical, gas separation and water desalination Presents a detailed discussion on the processing and performance of various MXenes towards different applications
Book Synopsis Chemistry of Two-dimensional Transition Metal Carbides (MXenes) by : Olha Mashtalir
Download or read book Chemistry of Two-dimensional Transition Metal Carbides (MXenes) written by Olha Mashtalir and published by . This book was released on 2015 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: With consumer trends pushing toward smaller, faster, more flexible, multitasking devices, researchers striving to meet these needs have targeted two-dimensional (2D) materials - and graphene in particular - as holding the most promise for use in advanced applications. But in 2011, a significant interest has been triggered by a newly discovered family of novel 2D materials - layered transitional metal carbides and carbonitrides, named MXenes. Those compounds were of general formula Mn+1XnTx, where M stands for metal atom, X is C and/or N, n = 1, 2 or 3, and Tx represents surface groups. Being initially suggested as a material for electrical energy storage systems, MXenes0́9 properties and their potential applications have not been explored. This work is the first complete study of MXenes0́9 chemistry that sheds light on the chemical composition, structure and properties of these novel materials and possible routes of its modification. The research was focused on 2D titanium carbide, Ti3C2Tx, chosen as the representative of the MXene family. The kinetic study of Ti3C2Tx synthesis discovered the main synthesis parameters, viz. temperature, time and particle size, that affect the etching process and define the quality of final product. MXenes were found to be able to spontaneously accommodate various ions and small organic molecules between the layers leading to preopening of the structure. A major challenge of large scale production of delaminated, atomically thin 2D MXene layers was solved with two delamination techniques involving dimethyl sulfoxide and isopropyl amine pre-intercalation followed by sonication in water. Ti3C2Tx was also found to possess adsorptive and photocatalytic properties, revealing its potential for environmental applications. It also showed limited stability in water and in the presence of oxygen, providing important practical information on proper handling and storage of MXene materials. Completion of this work allowed the performance of energy storage devices to be improved significantly, viz. Li-ion batteries and electrochemical capacitors, and gave rise to many other potential applications such as MXene-polymer composites, sorption, and catalysis. More importantly, it opened a path to the large-scale synthesis of thin, single-layer MXene sheets and led to establishing MXenes as fully-fledged members of the growing family of 2D materials.
Book Synopsis Mechanism and Kinetics of 2D Transition Metal Carbides (MXenes) Synthesis by : Mark Anayee
Download or read book Mechanism and Kinetics of 2D Transition Metal Carbides (MXenes) Synthesis written by Mark Anayee and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-dimensional (2D) nanomaterials including graphene, hexagonal boron nitride (h-BN), transition metal dichalcogenides (TMDs), and MXenes have attracted much attention because they present a wide range of physicochemical, optoelectronic, and mechanical properties along with various atomic structures and compositions. MXenes represent the largest and rapidly growing family of 2D transition metal carbides and/or nitrides, which exhibit unique combinations of properties, including metallic conductivity, hydrophilic surface chemistry, redox-active surface, and plasmonic behavior that make them attractive as electrodes for pseudocapacitive energy storage to coatings for electromagnetic interference shielding, transparent conducting displays for optoelectronics, conductive yarns for functional textiles, implantable electrodes for medicine, and many other applications. MXenes are typically derived via topochemical etching of atomically thick layers from precursor layered MAX phases using corrosive aqueous etchants. However, the chemical etching process is only somewhat optimized for one composition, and is nonetheless often slow, with low-yield, and results in defects in the materials.
Download or read book MXenes written by Yury Gogotsi and published by CRC Press. This book was released on 2023-08-24 with total page 1100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since their discovery in 2011, MXenes (2D carbides, nitrides, and carbonitrides of early transition metals) have developed into one of the largest and most intensively studied families of 2D materials. They offer unique properties and are being explored in a large variety of applications. This book compiles the most important research from a pioneer of the field, Professor Yury Gogotsi, and his interdisciplinary research team, as well as numerous collaborators worldwide. It reports on the discovery and rise of MXenes and describes their synthesis and processing, properties, and incorporation into polymer, ceramic, and metal matrices to produce composites. It also discusses the potential of MXenes for use in energy storage, optics, electronics, and sensing, as well as biomedical, environmental, and electrocatalysis applications. The book will appeal to anyone interested in nanomaterials and their synthesis, properties, and applications.
Book Synopsis MXenes: Emerging 2D Materials by : Om Prakash Pandey
Download or read book MXenes: Emerging 2D Materials written by Om Prakash Pandey and published by Springer Nature. This book was released on with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Two Dimensional Transition Metal Dichalcogenides by : Narayanasamy Sabari Arul
Download or read book Two Dimensional Transition Metal Dichalcogenides written by Narayanasamy Sabari Arul and published by Springer. This book was released on 2019-07-30 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book MAX Phases written by Michel W. Barsoum and published by John Wiley & Sons. This book was released on 2013-11-13 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this comprehensive yet compact monograph, Michel W. Barsoum, one of the pioneers in the field and the leading figure in MAX phase research, summarizes and explains, from both an experimental and a theoretical viewpoint, all the features that are necessary to understand and apply these new materials. The book covers elastic, electrical, thermal, chemical and mechanical properties in different temperature regimes. By bringing together, in a unifi ed, self-contained manner, all the information on MAX phases hitherto only found scattered in the journal literature, this one-stop resource offers researchers and developers alike an insight into these fascinating materials.
Book Synopsis Metal and Ceramic Matrix Composites by : Brian Cantor
Download or read book Metal and Ceramic Matrix Composites written by Brian Cantor and published by CRC Press. This book was released on 2003-11-01 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: With contributions from leading experts in their respective fields, Metal and Ceramic Matrix Composites provides a comprehensive overview of topics on specific materials and trends. It is a subject regularly included as a final year option in materials science courses and is also of much industrial and academic interest. The book begins wit
Book Synopsis Electrochemical Energy Storage by : Jean-Marie Tarascon
Download or read book Electrochemical Energy Storage written by Jean-Marie Tarascon and published by John Wiley & Sons. This book was released on 2015-02-23 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: The electrochemical storage of energy has become essential in assisting the development of electrical transport and use of renewable energies. French researchers have played a key role in this domain but Asia is currently the market leader. Not wanting to see history repeat itself, France created the research network on electrochemical energy storage (RS2E) in 2011. This book discusses the launch of RS2E, its stakeholders, objectives, and integrated structure that assures a continuum between basic research, technological research and industries. Here, the authors will cover the technological advances as well as the challenges that must still be resolved in the field of electrochemical storage, taking into account sustainable development and the limited time available to us.
Download or read book MXenes written by Subhendu Chakroborty and published by CRC Press. This book was released on 2024-08-07 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces MXenes and provides a summary of current discoveries in their synthesis, properties, characterization techniques, and emerging applications in several fields. It explores MXenes' distinctive electrical, mechanical, and biological features, as well as their applications. It discusses the various emerging applications of MXenes in a variety of fields, including regenerative medicine and tissue engineering, separation membranes, photocatalytic hydrogen production, environmental applications, and so forth. Features: Provides comprehensive review of synthesis and application of MXenes in 2D materials Explores greener approaches that reduce the environmental impact and cost of the process Includes frameworks for assessing the balance between the synthesis and applications Discusses an overview of MXenes with a focus on energy, health, and medical applications that can be improved with new encapsulation Reviews the modern spectroscopic instruments that are utilized in sophisticated characterization methods This book is aimed at researchers and graduate students in materials engineering, nanomaterials, and 2D materials.
Book Synopsis On the Electronic and Transport Properties of Two-dimensional Transition Metal Carbides and Carbonitrides (MXenes) by : Kanit Hantanasirisakul
Download or read book On the Electronic and Transport Properties of Two-dimensional Transition Metal Carbides and Carbonitrides (MXenes) written by Kanit Hantanasirisakul and published by . This book was released on 2021 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since their discovery reported in 2011, two-dimensional (2D) transition metal carbides, carbonitrides and nitrides, known collectively as MXenes, have shown promises in applications ranging from energy storage to electromagnetic interference (EMI) shielding, transparent electrodes, optoelectronics, wireless communication, and sensors to name a few. Exceptional performances in the aforementioned applications are enabled by MXenes' high electronic conductivity, that is metallic in nature. In addition, they have a wide range of optical properties, show easy processability and high mechanical strength. MXenes have a general formula of Mn+1XnTx, where M represents early transition metals (Ti, Mo, Cr, etc), X is carbon and/or nitrogen, Tx stands for surface terminations (-O, -OH, -F, -Cl, etc), and n is an integer between 1 and 4, which determines the layer thickness. Because of a large variety of chemical compositions including solid solutions, structural variations, and rich surface chemistry, MXenes are subject to multi-level manipulation of their properties, which is their unique advantage compared to majority other bulk or 2D materials. However, the level of understanding of how the structure and composition of MXenes affect their electronic and transport properties is still insufficient. This dissertation aims to establish relationships between MXenes' electronic properties and the intercalants, transition metals, X elements, and surface terminations with an overarching goal of demonstrating an ability to control MXenes' electronic and transport properties by controlling their structure and chemical composition. To explicitly correlate one of the MXenes' properties to their electronic behavior, the other factors must be precisely controlled and/or monitored. To this end, many in situ measurements were employed in this work such as in situ measurement of MXenes' electrical resistance or work function during thermal annealing under high vacuum, while the evolution of their surface chemistry and structures were monitored by electron energy loss spectroscopy or X-ray photoelectron spectroscopy. Temperature-dependence of resistivity in the range of 2-1050 K and magnetoresistance were primarily used to investigate MXene electronic transport property. My wok shows that large organic intercalants cause expansion of the interlayer spacing and hence higher resistivity of MXenes and alter the low-temperature transport behavior. Furthermore, removal of OH- and F-surface terminations results in lower resistivity of MXenes and more than 1 eV shift of the work function of Ti3C2Tx. Moreover, replacing approximately half of the carbon atoms in Ti3C2Tx with nitrogen atoms, forming Ti3CNTx, leads to higher electronic resistivity due to lower carrier mobility. Finally, magnetism introduced into a MXene via manipulation of the transition metal layers has been shown to strongly affect magnetotransport properties of Cr2TiC2Tx. This work paves the way toward a better understanding of MXenes' structure, processing, and property, and performance relationships, focusing on electronic and transport properties as well as the realization of MXenes for high-performance optoelectronic devices and 2D heterostructures.
Book Synopsis Tribology of Graphene by : Oleksiy Penkov
Download or read book Tribology of Graphene written by Oleksiy Penkov and published by Elsevier. This book was released on 2020-01-08 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tribology of Graphene: Simulation Methods, Preparation Methods, and Their Applications provides an exhaustive reference guide on the tribology of graphene-based materials. The book begins with a discussion on the selection of the proper graphene-based material and then segues into how to choose a deposition method, how to control of its structure and properties, and the most effective working conditions and applications. The latest developments in theoretical simulations of graphene friction, preparation methods, and effective applications are all reviewed, as are the ways various graphene coatings can be successfully employed to decrease friction and wear in nano-, micro- and macro-mechanical applications. Synthesizes the broad current research in tribological applications of graphene all in one place Covers theoretical simulations and preparation methods, including insights on how to put them into practice, allowing for quicker and more effective selection of graphene-based material Provides a broader perspective by discussing both graphene-based composites and additives
